ÐÏࡱá > þÿ M O þÿÿÿ J K L ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿì¥Á a ð¿ = bjbj ‡ ‡ *@ híGbhíGbØÙ ÿÿ ÿÿ ÿÿ · – – – – – ÿÿÿÿ ª ª ª ª L ö ü ª ¤, ª ò ò ò ò ò Í Í Í '+ )+ )+ )+ )+ )+ )+ $ N. ¶ 1 œ M+ – Í Í Í Í Í M+ – – ò ò Û ^, ë* ë* ë* Í 6 – ò – ò '+ ë* Í '+ ë* ë* ë* ò ÿÿÿÿ 0$CÖØ}Õ ÿÿÿÿ Æ ë* + t, 0 ¤, ë*  1 É* "  1 ë*  1 – ë* ( Í Í ë* Í Í Í Í Í M+ M+ ë* Í Í Í ¤, Í Í Í Í ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ  1 Í Í Í Í Í Í Í Í Í B \ : Title 10—DEPARTMENT OF NATURAL RESOURCES Division 60—Safe Drinking Water Commission Chapter 15—Lead and Copper 10 CSR 60-15.010 General Requirements PURPOSE: This rule gives an overview of requirements covered in the national primary drinking water regulations for lead and copper. (1) Applicability and Effective Dates. The requirements of this chapter constitute the Missouri public drinking water rules for lead and copper. Unless otherwise indicated, each of the provisions of this chapter applies to community water systems and nontransient noncommunity water systems (after this referred to as water systems or systems). (2) Scope. These rules establish a treatment technique that includes requirements for corrosion control treatment, source water treatment, lead service line replacement, and public education. These requirements are triggered, in some cases, by lead and copper action levels measured in samples collected at consumers’ taps. (3) Lead and Copper Action Levels. (A) The lead action level is exceeded if the concentration of lead in more than ten percent (10%) of tap water samples collected during any monitoring period conducted in accordance with 10 CSR 60-15.070 is greater than 0.015 milligrams/liter (mg/l) (that is, if the ninetieth percentile lead level is greater than 0.015 mg/l). (B) The copper action level is exceeded if the concentration of copper in more than ten percent (10%) of tap water samples collected during any monitoring period conducted in accordance with 10 CSR 60-15.070 is greater than 1.3 mg/l (that is, if the ninetieth percentile copper level is greater than 1.3 mg/l). (C) The ninetieth percentile lead and copper levels shall be computed as follows: 1. The results of all lead or copper samples taken during a monitoring period shall be placed in ascending order from the sample with the lowest concentration to the sample with the highest concentration. Each sampling result shall be assigned a number, ascending by single integers beginning with the number one (1) for the sample with the lowest contaminant level. The number assigned to the sample with the highest contaminant level shall be equal to the total number of samples taken; 2. The number of samples taken during the monitoring period shall be multiplied by 0.9; 3. The contaminant concentration in the numbered sample yielded by the calculation in paragraph (3)(C)2. is the ninetieth percentile contaminant level; 4. For water systems serving fewer than one hundred (100) people that collect five (5) samples per monitoring period, the ninetieth percentile is computed by taking the average of the highest and second highest concentrations; and 5. For a public water system that has been allowed by the department to collect fewer than five (5) samples in accordance with 10 CSR 60-15.070(3), the sample result with the highest concentration is considered the ninetieth percentile value. (4) Corrosion Control Treatment Require-ments. (A) All water systems shall install and operate optimal corrosion control treatment as defined in 10 CSR 60-15.030. (B) Any water system that complies with the applicable corrosion control treatment requirements specified by the state under 10 CSR 60-15.020 and 10 CSR 60-15.030 shall be deemed in compliance with the treatment requirement contained in subsection (4)(A). (5) Source Water Treatment Requirements. Any system exceeding the lead or copper action level shall implement all applicable source water treatment requirements specified by the state under 10 CSR 60-15.040. (6) Lead Service Line Replacement Requirements. Any system exceeding the lead action level after implementation of applicable corrosion control and source water treatment requirements shall complete the lead service line replacement requirements contained in 10 CSR 60-15.050. (7) Public Education Requirements. Pursuant to 10 CSR 60-15.060, all water systems must provide a consumer notice of lead tap water monitoring results to persons served at the sites (taps) that are tested. Any system exceeding the lead action level shall implement the public education requirements contained in 10 CSR 60-15.060. (8) Monitoring and Analytical Requirements. Tap water monitoring for lead and copper, monitoring for water quality parameters, source water monitoring for lead and copper, and analyses of the monitoring results under this section shall be completed in compliance with 10 CSR 60-15.070, 10 CSR 60-15.080, 10 CSR 60-15.090 and 10 CSR 60-5.010(1). (9) Reporting Requirements. Systems shall report to the state any information required by the treatment provisions of this section and 10 CSR 60-7.020. (10) Record-keeping Requirements. Systems shall maintain records in accordance with 10 CSR 60-9.010. (11) Violation of National Primary Drinking Water Regulations. Failure to comply with the applicable requirements of 10 CSR 60-15.010–10 CSR 60-15.090, 10 CSR 60-5.010, 10 CSR 60-7.020 and 10 CSR 60-9.010, including requirements established by the state pursuant to these provisions, shall constitute a violation of the state public drinking water rules for lead, copper, or both. AUTHORITY: section 640.100, RSMo Supp. 2011.* Original rule filed Aug. 4, 1992, effective May 6, 1993. Amended: Filed Oct. 17, 2011, effective May 30, 2012. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999, 2002, 2006. 10 CSR 60-15.020 Applicability of Corro-sion Control Treatment Steps to Small, Medium-Size, and Large Water Systems PURPOSE: This rule establishes deadlines for public water systems to complete corrosion control treatment required in 10 CSR 60-15.030 and to conduct associated monitoring. (1) A large system (serving more than fifty thousand (50,000) persons) shall complete the corrosion control treatment steps as follows unless it is deemed to have optimized corrosion control under paragraph (1)(B)1. or 2. of this rule. (A) Treatment Steps and Deadlines for Large Systems. 1. The system shall conduct initial monitoring (10 CSR 60-15.070(4)(A) and 10 CSR 60-15.080(2)) during two (2) consecutive six- (6-) month monitoring periods by January 1, 1993. 2. The system shall complete corrosion control studies (10 CSR 60-15.030(3)) by July 1, 1994. 3. The department shall designate optimal corrosion control treatment (10 CSR 60-15.030(4)) by January 1, 1995. 4. The system shall install optimal corrosion control treatment (10 CSR 60-15.030(6)) by January 1, 1997. 5. The system shall complete follow-up sampling (10 CSR 60-15.070(4)(B) and 10 CSR 60-15.080(3)) by January 1, 1998. 6. The department shall review installation of treatment and designate optimal water quality control parameters (10 CSR 60-15.030(7)) by July 1, 1998. 7. The system shall operate in compliance with the department-specified optimal water quality control parameters (10 CSR 60-15.030(8)) and continue to conduct tap ýÿs a m p l i n g ( 1 0 C S R 6 0 - 1 5 . 0 7 0 ( 4 ) ( C ) a n d 1 0 C S R 6 0 - 1 5 . 0 8 0 ( 4 ) ) . ( B ) A l a r g e s y s t e m i s d e e m e d t o h a v e o p t i m i z e d c o r r o s i o n c o n t r o l a n d i s n o t r e q u i r e d t o c o m p l e t e t h e a p p l i c a b l e c o r r o s i o n c o n t r o l t r e a t m e n t s t e p s i d e n t i f i e d i n t h i s s e c t i o n i f t h e s y s t e m s a t i s f i e s one (1) of the following criteria. Any such large system deemed to have optimized corrosion control, and which has treatment in place, shall continue to operate and maintain optimal corrosion control treatment and meet any requirements that the department determines appropriate to ensure optimal corrosion control treatment is maintained. 1. The system demonstrates to the satisfaction of the department that it has conducted activities equivalent to the corrosion control steps applicable to large systems. If the department makes this determination, it shall provide the system with written notice explaining the basis for its decision and shall specify the water quality control parameters representing optimal corrosion control in accordance with 10 CSR 60-15.030(7). Water systems deemed to have optimized corrosion control shall operate in compliance with the department-designated optimal water quality control parameters in accordance with 10 CSR 60-15.030(8) and continue to conduct lead and copper tap and water quality parameter sampling in accordance with 10 CSR 60-15.070(4)(C) and 10 CSR 60-15.080(4). A system shall provide the department with the following information in order to support this determination: A. The results of all test samples collected for each of the water quality parameters in 10 CSR 60-15.030(3)(C); B. A report explaining the test methods used by the water system to evaluate the corrosion control treatments listed in 10 CSR 60-15.030(3)(A), the results of all tests conducted, and the basis for the system’s selection of optimal corrosion control treatment; C. A report explaining how corrosion control has been installed and how it is being maintained to insure minimal lead and copper concentrations at consumers’ taps; and D. The results of tap water samples collected in accordance with 10 CSR 60-15.070 at least once every six (6) months for one (1) year after corrosion control has been installed. 2. The water system submits results of tap water monitoring conducted in accordance with 10 CSR 60-15.070 and source water monitoring conducted in accordance with 10 CSR 60-15.090 that demonstrates for two (2) consecutive six- (6-) month monitoring periods that the difference between the ninetieth percentile tap water lead level, computed under 10 CSR 60-15.010(3)(C), and the highest source water lead concentration is less than the practical quantitation level for lead specified in 10 CSR 60-5.010(8)(B). A. Those systems whose highest source water lead level is below the method detection limit may also be deemed to have optimized corrosion control under this paragraph if the ninetieth percentile tap water lead level is less than or equal to the practical quantitation level for lead for two (2) consecutive six- (6-) month monitoring periods. B. Any water system deemed to have optimized corrosion control in accordance with this paragraph (1)(B)2. shall continue monitoring for lead and copper at the tap no less frequently than once every three (3) calendar years using the reduced number of sites specified in 10 CSR 60-15.070(3) and collecting the samples at times and locations specified in 10 CSR 60-15.070(4)(D)4. C. Any water system deemed to have optimized corrosion control pursuant to this paragraph (1)(B)2. shall notify the department in writing pursuant to 10 CSR 60-7.020(1)(C) of any upcoming long-term changes in treatment or the addition of a new source as described in that subsection. The department must review and approve the addition of a new source or long-term change in water treatment before it is implemented by the water system. D. A system is not deemed to have optimized corrosion control pursuant to this paragraph (1)(B)2. and shall implement corrosion control treatment pursuant to subparagraph (1)(B)2.E. of this rule unless it meets the copper action level. E. Any system triggered into corrosion control because it is no longer deemed to have optimized corrosion control under paragraph (1)(B)2. shall implement corrosion control treatment in accordance with the deadlines in subsection (2)(A) of this rule. Any such large system shall adhere to the schedule specified in subsection (2)(A) of this rule for medium-size systems, with the time periods for completing each step being triggered by the date the system is no longer deemed to have optimized corrosion control under paragraph (1)(B)2. of this rule. (2) A small system (serving fewer than three thousand three hundred (3,300) persons) and a medium-size system (serving three thousand three hundred one to fifty thousand (3,301–50,000) persons) shall complete the corrosion control treatment steps specified as follows unless it is deemed to have optimized corrosion control under paragraph (2)(B)1., 2., or 3. of this rule: (A) Treatment Steps and Deadlines for Small and Medium-Size Systems. 1. The system shall conduct initial tap sampling (10 CSR 60-15.070(4)(A) and 10 CSR 60-15.080(2)) until the system either exceeds the lead or copper action level or becomes eligible for reduced monitoring under 10 CSR 60-15.070(4)(D). A system exceeding the lead or copper action level shall recommend optimal corrosion control treatment (10 CSR 60-15.030(1)) within six (6) months after the end of the monitoring period during which it exceeds one (1) of the action levels. 2. Within twelve (12) months after the end of the monitoring period during which a system exceeds the lead or copper action level, the department may require the system to perform corrosion control studies (10 CSR 60-15.030(2)). If the department does not require the system to perform such studies, the department shall specify optimal corrosion control treatment within the following time frames: A. For medium-size systems, within eighteen (18) months after the end of the monitoring period during which that system exceeds the lead or copper action level; or B. For small systems, within twenty-four (24) months after the end of the monitoring period that system exceeds the lead or copper action level. 3. If the department requires a system to perform corrosion control studies under paragraph (2)(A)2. of this rule, the system shall complete the studies (10 CSR 60-15.030(3)) within eighteen (18) months after the department requires that those studies be conducted. 4. If the system has performed corrosion control studies under paragraph (2)(A)2. of this rule, the department shall designate optimal corrosion control treatment (10 CSR 60-15.030(4)) within six (6) months after completion of paragraph (2)(A)3. of this rule. 5. The system shall install optimal corrosion control treatment (10 CSR 60-15.030(6)) within twenty-four (24) months after the department designates that treatment. 6. The system shall complete follow-up sampling (10 CSR 60-15.070(4)(B) and 10 CSR 60-15.080(3)) within thirty-six (36) months after the department designates optimal corrosion control treatment. 7. The department shall review the system’s installation of treatment and designate optimal water quality control parameters (10 CSR 60-15.030(7)) within six (6) months after completion of paragraph (2)(A)6. of this rule. 8. The system shall operate in compliance with the department-designated optimal water quality control parameters (10 CSR 60-15.030(8)) and continue to conduct tap sampling as specified in 10 CSR 60-15.070(4)(C) and 10 CSR 60-15.080(4); (B) A small- or medium-size water system is deemed to have optimized corrosion control and is not required to complete the applicable corrosion control treatment steps identified in this section if the system satisfies one (1) of the following criteria. Any such system deemed to have optimized corrosion control, and which has treatment in place, shall continue to operate and maintain optimal corrosion control treatment and meet any requirements that the department determines appropriate to ensure optimal corrosion control treatment is maintained. 1. The system meets the lead and copper action levels during each of two (2) consecutive six- (6-) month monitoring periods conducted in accordance with 10 CSR 60-15.070. 2. The system demonstrates to the satisfaction of the department that it has conducted activities equivalent to the corrosion control steps applicable to medium-size or small systems under this section. If the department makes this determination, it shall provide the system with written notice explaining the basis for its decision and shall specify the water quality control parameters representing optimal corrosion control in accordance with 10 CSR 60-15.030(7). Water systems deemed to have optimized corrosion control under this paragraph shall operate in compliance with the department-designated optimal water quality control parameters in accordance with 10 CSR 60-15.030(8) and shall continue to conduct lead and copper tap and water quality parameter sampling in accordance with 10 CSR 60-15.070(4)(C) and 10 CSR 60-15.080(4). The system shall provide the department with the following information in order to support a determination: A. The results of all test samples collected for each of the water quality parameters in 10 CSR 60-15.030(3)(C); B. A report explaining the test methods used by the water system to evaluate the corrosion control treatments listed in 10 CSR 60-15.030(3)(A), the results of all tests conducted and the basis for the system’s selection of optimal corrosion control treatment; C. A report explaining how corrosion control has been installed and how it is being maintained to insure minimal lead and copper concentrations at consumers’ taps; and D. The results of tap water samples collected in accordance with 10 CSR 60-15.070 at least once every six (6) months for one (1) year after corrosion control has been installed. 3. Any water system is deemed to have optimized corrosion control if it submits results of tap water monitoring conducted in accordance with 10 CSR 60-15.070 and source water monitoring conducted in accordance with 10 CSR 60-15.090 that demonstrates for two (2) consecutive six- (6-) month monitoring periods that the difference between the ninetieth percentile tap water lead level computed under 10 CSR 60-15.010(3)(C) and the highest source water lead concentration is less than the practical quantitation level for lead specified in 10 CSR 60-5.010(5)(H). A. Those systems whose highest source water lead level is below the method detection limit may also be deemed to have optimized corrosion control under this paragraph if the ninetieth percentile tap water lead level is less than or equal to the practical quantitation level for lead for two (2) consecutive six- (6-) month monitoring periods. B. Any water system deemed to have optimized corrosion control in accordance with this paragraph (2)(B)3. shall continue monitoring for lead and copper at the tap no less frequently than once every three (3) calendar years using the reduced number of sites specified in 10 CSR 60-15.070(3) and collecting the samples at times and locations specified in 10 CSR 60-15.070(4)(D)4. C. Any water system deemed to have optimized corrosion control pursuant to this paragraph (2)(B)3. shall notify the department in writing pursuant to 10 CSR 60-7.020(1)(C) of any change in treatment or the addition of a new source. The department may require any such system to conduct additional monitoring or to take other action the department deems appropriate to ensure that such systems maintain minimal levels of corrosion in the distribution system. D. A system is not deemed to have optimized corrosion control pursuant to this paragraph (2)(B)3., and shall implement corrosion control treatment pursuant to subparagraph (2)(B)3.E. of this rule unless it meets the copper action level. E. Any system triggered into corrosion control because it is no longer deemed to have optimized corrosion control under paragraph (2)(B)3. shall implement corrosion control treatment in accordance with the deadlines in subsection (2)(A) of this rule. Any such large system shall adhere to the schedule specified in subsection (2)(A) of this rule for medium-size systems, with the time periods for completing each step being triggered by the date the system is no longer deemed to have optimized corrosion control under paragraph (2)(B)3. of this rule; and (C) Any small- or medium-size water system that is required to complete the corrosion control steps due to its exceedance of the lead or copper action level may cease completing the treatment steps whenever the system meets both action levels during each of two (2) consecutive monitoring periods conducted pursuant to 10 CSR 60-15.070 and submits the results to the department. If any such water system after that exceeds the lead or copper action level during any monitoring period, the system (or the department, as the case may be) shall recommence completion of the applicable treatment steps, beginning with the first treatment step which was not previously completed in its entirety. The department may require a system to repeat treatment steps previously completed by the system where the department determines that this is necessary to implement properly the treatment requirements of this section. The department shall notify the system in writing of the determination and explain the basis for its decision. The requirement for any small- or medium-size system to implement corrosion control treatment steps (including systems deemed to have optimized corrosion control) is triggered whenever any small- or medium-size system exceeds the lead or copper action level. AuthORITY: section 640.100, RSMo 2016.* Original rule filed Aug. 4, 1992, effective May 6, 1993. Amended: Filed Aug. 14, 2001, effective April 30, 2002. Amended: Filed Oct. 17, 2011, effective May 30, 2012. Amended: Filed March 15, 2019, effective Nov. 30, 2019. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999, 2002, 2006, 2012, 2014. 10 CSR 60-15.030 Description of Corrosion Control Treatment Requirements PURPOSE: This rule describes the corrosion control treatment requirements which are applicable to all water systems under 10 CSR 60-15.020. (1) Based upon the results of lead and copper tap monitoring and water quality parameter monitoring, small- (serving fewer than three thousand three hundred (3,300) persons) and medium-size (serving three thousand three hundred one to fifty thousand (3,301–50,000) persons) water systems exceeding the lead or copper action level shall recommend installation of one (1) or more of the corrosion control treatments listed in subsection (3)(A), which the system believes constitutes optimal corrosion control for that system. The department may require the system to conduct additional water quality parameter monitoring in accordance with 10 CSR 60-15.080(2) and perform corrosion control studies as described in this rule to assist the department in reviewing the system’s recommendations. (2) The department may require any small- or medium-sized systems that exceed the lead or copper action level to perform corrosion control studies under section (3) of this rule to identify optimal corrosion control treatment for the system. (3) Performance of Corrosion Control Studies. (A) Any public water system performing corrosion control studies shall evaluate the effectiveness of each of the following treatments and, if appropriate, combinations of the following treatments to identify the optimal corrosion control treatment for that system: 1. Alkalinity and pH adjustment; 2. Calcium hardness adjustment; and 3. The addition of a phosphate or silicate based corrosion inhibitor at a concentration sufficient to maintain an effective residual concentration in all test tap samples. (B) The water system shall evaluate each of the corrosion control treatments using either pipe rig/loop tests, metal coupon tests, partial-system tests or analyses based on documented analogous treatments with other systems of similar size, water chemistry and distribution system configuration. (C) The water system shall measure the following water quality parameters in any tests conducted under this section before and after evaluating the corrosion control treatments listed in paragraph (3)(A)1. of this rule: 1. Lead; 2. Copper; 3. pH; 4. Alkalinity; 5. Calcium; 6. Conductivity; 7. Orthophosphate (when an inhibitor containing a phosphate compound is used); 8. Silicate (when an inhibitor containing a silicate compound is used); and 9. Water temperature. (D) The water system shall identify all chemical or physical constraints that limit or prohibit the use of a particular corrosion control treatment and document these constraints with at least one (1) of the following: 1. Data and documentation showing that a particular corrosion control treatment has adversely affected other water treatment processes when used by another water system with comparable water quality characteristics; or 2. Data and documentation demonstrating that the water system has previously attempted to evaluate a particular corrosion control treatment and has found that the treatment is ineffective or adversely affects other water quality treatment processes. (E) The water system shall evaluate the effect of the chemicals used for corrosion control treatment on other water quality treatment processes. (F) On the basis of an analysis of the data generated during each evaluation, the water system shall recommend to the department, in writing, the treatment option that the corrosion control studies indicate constitutes optimal corrosion control treatment for that system. The water system shall provide a rationale for its recommendation along with all supporting documentation specified in this section. (4) Based upon consideration of available information including, where applicable, studies performed under section (3) of this rule and a system’s recommended treatment alternative, the department shall either approve the corrosion control treatment option recommended by the system or designate alternative corrosion control treatment(s) from among those listed in subsection (3)(A) of this rule. When designating optimal treatment, the department shall consider the effects that additional corrosion control treatment will have on the water quality parameters and on other water quality treatment processes. (5) The department, in writing, shall notify the system of its decision on optimal corrosion control treatment and explain the basis for this determination. If the department requests additional information to aid its review, the water system shall provide the information. (6) Each system shall properly install and operate throughout its distribution system the optimal corrosion control treatment designated by the department. (7) The department shall evaluate the results of all lead and copper tap samples and water quality parameter samples submitted by the water system and determine whether the system has properly installed and operated the optimal corrosion control treatment designated by the department. Upon reviewing the results of tap water and water quality parameter monitoring by the system, both before and after the system installs optimal corrosion control treatment, the department shall designate— (A) A minimum value or a range of values for pH measured at each entry point to the distribution system; (B) A minimum pH value measured in all tap samples. That value shall be equal to or greater than 7.0, unless the department determines that meeting a pH level of 7.0 is not technologically feasible or is not necessary for the system to optimize corrosion control; (C) If a corrosion inhibitor is used, a minimum concentration or a range of concentrations for the inhibitor measured at each entry point to the distribution system and in all tap samples, that the department determines is necessary to form a passivating film on the interior walls of the pipes of the distribution system; (D) If alkalinity is adjusted as part of optimal corrosion control treatment, a minimum concentration or a range of concentrations for alkalinity, measured at each entry point to the distribution system and in all tap samples; (E) If calcium carbonate stabilization is used as part of corrosion control, a minimum concentration or a range of concentrations for calcium, measured in all tap samples. (F) The values for the applicable water quality control parameters listed in this section shall be those that the department determines to reflect optimal corrosion control treatment for the system. The department may designate values for additional water quality control parameters determined by the department to reflect optimal corrosion control for the system. The department shall notify the system, in writing, of these determinations and explain the basis for its decisions. (8) All systems optimizing corrosion control shall continue to operate and maintain optimal corrosion control treatment, including maintaining water quality parameters at or above minimum values or within ranges designated by the department under section (7) of this rule for all samples collected under 10 CSR 60-15.080(4)–(6). Compliance with this section shall be determined every six (6) months, as specified under 10 CSR 60-15.080(4). A water system is out of compliance with the requirements of this section (8) for a six (6)-month period if it has excursions for any department-specified parameter on more than nine (9) days during the period. An excursion occurs whenever the daily value for one (1) or more of the water quality parameters measured at a sampling location is below the minimum value or outside the range designated by the department. Daily values are calculated as follows. The department shall have discretion to delete results of obvious sampling errors from this calculation. (A) On days when more than one (1) measurement for the water quality parameter is collected at the sampling location, the daily value shall be the average of all results collected during the day regardless of whether they are collected through continuous monitoring, grab sampling, or a combination of both. (B) On days when only one (1) measurement for the water quality parameter is collected at the sampling location, the daily value shall be the result of that measurement. (C) On days when no measurement is collected for the water quality parameter at the sampling location, the daily value shall be the daily value calculated on the most recent day on which the water quality parameter was measured at the sample site. (9) The department, upon its own initiative or in response to a request by a water system or other interested party, may modify its determination of the optimal corrosion control treatment or optimal water quality control parameters. A request for modification by a system or other interested party shall be in writing, explain why the modification is appropriate and provide supporting documentation. The department may modify its determination where it concludes that the change is necessary to ensure that the system continues to optimize corrosion control treatment. A revised determination shall be made in writing, setting forth the new treatment requirements, explaining the basis for the department’s decision and providing an implementation schedule for completing the treatment modifications. Authority: section 640.100, RSMo 2000.* Original rule filed Aug. 4, 1992, effective May 6, 1993. Amended: Filed Aug. 14, 2001, effective April 30, 2002. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999. 10 CSR 60-15.040 Source Water Treatment Requirements PURPOSE: This rule describes the required corrosion control treatment steps for a system’s source water and establishes treatment requirement deadlines. (1) The following are deadlines for completing source water treatment steps: (A) A system exceeding the lead or copper action level shall complete lead and copper source water monitoring under 10 CSR 60-15.090(2) and make a treatment recommendation to the department no later than one hundred eighty (180) days after the end of the monitoring period during which the lead or copper action level was exceeded; (B) The department shall make a determination regarding source water treatment within six (6) months after submission of monitoring results under subsection (1)(A) of this rule; (C) If the department requires installation of source water treatment, the system shall install the treatment within twenty-four (24) months after the completion of subsection (1)(B) of this rule; (D) The system shall complete follow-up tap water monitoring and source water monitoring within thirty-six (36) months after completion of subsection (1)(B) of this rule; (E) The department shall review the system’s installation and operation of source water treatment and specify maximum permissible source water levels within six (6) months after completion of subsection (1)(D) of this rule; (F) The system shall operate in compliance with the department-specified maximum permissible lead and copper source water levels and continue source water monitoring. (2) Any system which exceeds the lead or copper action level shall recommend in writing to the department the installation and operation of one (1) of the source water treatments listed in the following subsections. A system may recommend that no treatment be installed based upon a demonstration that source water treatment is not necessary to minimize lead and copper levels at users’ taps: (A) The department shall complete an evaluation of the results of all source water samples submitted by the water system to determine whether source water treatment is necessary to minimize lead or copper levels in water delivered to users’ taps. If the department determines that treatment is needed, the department shall either require installation and operation of the source water treatment recommended by the system, if any, or require the installation and operation of another source water treatment from the following: ion exchange, reverse osmosis, lime softening, or coagulation/filtration. If the department requests additional information to aid in its review, the water system shall provide the information by the date specified by the department in its request. The department shall notify the system in writing of its determination and set forth the basis for its decision; (B) Each system shall properly install and operate the source water treatment designated by the department; (C) The department shall review the source water samples taken by the water system both before and after the system installs source water treatment, and determine whether the system has properly installed and operated the source water treatment designated by the department. Based upon its review, the department shall designate the maximum permissible lead and copper concentrations for finished water entering the distribution system. These levels shall reflect the contaminant removal capability of the treatment properly operated and maintained. The department shall notify the system in writing and explain the basis for its decision; (D) Each water system shall maintain lead and copper levels below the maximum permissible concentrations designated by the department at each sampling point monitored in accordance with 10 CSR 60-15.090. The system is out of compliance if the level of lead or copper at any of the sampling points are greater than the maximum permissible concentration designated by the department; or (E) The department, upon its own initiative or in response to a request by a water system or other interested party, may modify its determination of the source water treatment or maximum permissible lead and copper concentrations for finished water entering the distribution system. A request for modification by a system or other interested party shall be in writing, explain why the ­modification is appropriate and provide supporting documentation. The department may modify its determination where it concludes that the change is necessary to ensure that the system continues to minimize lead and copper concentrations in the source water. A revised determination shall be made in writing, set forth the new treatment requirements, explain the basis for the department’s decision and provide an implementation schedule for completing the treatment modifications. AUTHORITY: section 640.100, RSMo Supp. 2011.* Original rule filed Aug. 4, 1992, effective May 6, 1993. Amended: Filed Oct. 17, 2011, effective May 30, 2012. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999, 2002, 2006. 10 CSR 60-15.050 Lead Service Line Replacement Requirements PURPOSE: This rule sets forth requirements for the removal of lead service lines if lead action levels are exceeded, and corrosion control efforts and source water treatment are unsuccessful in lowering the lead concentration levels in tap samples. (1) Systems that fail to meet the lead action level in tap samples taken pursuant to 10 CSR 60-15.070(4)(B), after installing corrosion control, source water treatment, or both (whichever sampling occurs later), shall replace lead service lines in accordance with the requirements of this section. If a system is in violation of 10 CSR 60-15.020 or 10 CSR 60-15.040 for failure to install source water or corrosion control treatment, the department may require the system to commence lead service line replacement under this section after the date by which the system was required to conduct monitoring under 10 CSR 60-15.070(4)(B) has passed. (2) A water system shall replace annually at least seven percent (7%) of the initial number of lead service lines in its distribution system. The initial number of lead service lines is the number of lead lines in place at the time the replacement program begins. The system shall identify the initial number of lead service lines in its distribution system, including an identification of the portion(s) owned by the system, based upon a materials evaluation, including the evaluation required under 10 CSR 60-15.070(1) and relevant legal authorities (e.g., contracts, local ordinances) regarding the portion owned by the system. The first year of lead service line replacement shall begin on the first day following the end of the monitoring period in which the action level was exceeded under section (1) of this rule. If monitoring is required annually or less frequently, the end of the monitoring period is September 30 of the calendar year in which the sampling occurs. If the department has established an alternate monitoring period, then the end of the monitoring period will be the last day of that period. (3) Any water system resuming a lead service line replacement program after the cessation of its lead service line replacement program as allowed by section (7) of this rule shall update its inventory of lead service lines to include those sites that were previously determined not to require replacement through the sampling provision under section (4) of this rule. The system will then divide the updated number of remaining lead service lines by the number of remaining years in the program to determine the number of lines that must be replaced per year (seven percent (7%) lead service line replacement is based on a fifteen- (15-) year replacement program, so, for example, systems resuming lead service line replacement after previously conducting two (2) years of replacement would divide the updated inventory by thirteen (13)). For those systems that have completed a fifteen- (15-) year lead service line replacement program, the department will determine a schedule for replacing or retesting lines that were previously tested out under the replacement program when the system re-exceeds the action level. (4) A system is not required to replace an individual lead service line if the lead concentration in all service line samples from that line, taken pursuant to 10 CSR 60-15.070(2)(C), is less than or equal to 0.015 milligrams per liter (mg/L). (5) A water system shall replace that portion of the lead service line that it owns. In cases where the system does not own the entire lead service line, the system shall notify the owner of the line, or the owner’s authorized agent, that the system will replace the portion of the service line that it owns and shall offer to replace the owner’s portion of the line. A system is not required to bear the cost of replacing the privately-owned portion of the line, nor is it required to replace the privately-owned portion where the owner chooses not to pay the cost of replacing the privately-owned portion of the line, or where replacing the privately-owned portion would be precluded by department, local, or common law. A water system that does not replace the entire length of the service line also shall complete the following tasks: (A) At least forty-five (45) days prior to commencing with the partial replacement of a lead service line, the water system shall provide notice to the resident(s) of all buildings served by the line explaining that they may experience a temporary increase of lead levels in their drinking water, along with guidance on measures consumers can take to minimize their exposure to lead. The department may allow the water system to provide this notice less than forty-five (45) days prior to commencing partial lead service line replacement where such replacement is in conjunction with emergency repairs. In addition, the water system shall inform the resident(s) served by the line that the system will, at the system’s expense, collect a sample from each partially-replaced lead service line that is representative of the water in the service line for analysis of lead content, as prescribed under 10 CSR 60-15.070(2)(C), within seventy-two (72) hours after the completion of the partial replacement of the service line. The system shall collect the sample and report the results of the analysis to the owner and the resident(s) served by the line within three (3) business days of receiving the results. Mailed notices postmarked within three (3) business days of receiving the results shall be considered “on time”; and (B) The water system shall provide the information required by subsection (4)(A) of this rule to the residents of individual dwellings by mail or by other methods approved by the department. In instances where multi-family dwellings are served by the line, the water system shall have the option to post the information at a conspicuous location. (6) The department shall require a system to replace lead service lines on a shorter time schedule than that required by this section, taking into account the number of lead service lines in the system, where such a shorter replacement schedule is feasible. The department shall make this determination in writing and notify the system of its finding within six (6) months after the system is triggered into lead service line replacement based on monitoring referenced in section (1) of this rule. (7) Any system may cease replacing lead service lines whenever first-draw tap samples collected pursuant to 10 CSR 60-15.070(4)(C) meet the lead action level during each of two (2) consecutive monitoring periods and the system submits the results to the department. If the first-draw tap samples in any such water system after that exceed the lead action level, the system shall recommence replacing lead service lines, pursuant to section (2) of this rule. (8) To demonstrate compliance with sections (1)–(5) of this rule, a system shall report to the department the information specified in 10 CSR 60-7.020(5). Authority: section 640.100, RSMo Supp. 2011.* Original rule filed Aug. 4, 1992, effective May 6, 1993. Amended: Filed Aug. 14, 2001, effective April 30, 2002. Amended: Filed Oct. 17, 2011, effective May 30, 2012. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999, 2002, 2006. 10 CSR 60-15.060 Public Education Requirements PURPOSE: This rule sets forth the content and mode of delivery of written and broadcast materials to be used by water systems when action levels have been exceeded. It also addresses the water system’s responsibility when a customer requests supplemental monitoring after an action level has been exceeded. (1) Content of written public education materials. (A) Community water systems and non-transient non-community water systems. Water systems must include the following elements in printed materials (for example, brochures and pamphlets) in the same order as listed below. In addition, language in paragraphs (1)(A)1., 2., and 4. of this rule must be included in the materials, exactly as written, except for the text in brackets in these paragraphs for which the water system must include system-specific information. Any additional information presented by a water system must be consistent with the information below and be in plain language that can be understood by the general public. Water systems must submit all written public education materials to the department prior to delivery. The department may require the system to obtain approval of the content of written public materials prior to delivery. 1. IMPORTANT INFORMATION ABOUT LEAD IN YOUR DRINKING WATER. [INSERT NAME OF WATER SYSTEM] found elevated levels of lead in drinking water in some homes/buildings. Lead can cause serious health problems, especially for pregnant women and young children. Please read this information closely to see what you can do to reduce lead in your drinking water. 2. Health effects of lead. Lead can cause serious health problems if too much enters your body from drinking water or other sources. It can cause damage to the brain and kidneys and can interfere with the production of red blood cells that carry oxygen to all parts of your body. The greatest risk of lead exposure is to infants, young children, and pregnant women. Scientists have linked the effects of lead on the brain with lowered IQ in children. Adults with kidney problems and high blood pressure can be affected by low levels of lead more than healthy adults. Lead is stored in the bones, and it can be released later in life. During pregnancy, the child receives lead from the mother’s bones, which may affect brain development. 3. Sources of lead. A. Explain what lead is. B. Explain possible sources of lead in drinking water and how lead enters drinking water. Include information on home/building plumbing materials and service lines that may contain lead. C. Discuss other important sources of lead exposure in addition to drinking water (e.g., paint). 4. Discuss the steps the consumer can take to reduce their exposure to lead in drinking water. A. Encourage running the water to flush out the lead. B. Explain concerns with using hot water from the tap and specifically caution against the use of hot water for preparing baby formula. C. Explain that boiling water does not reduce lead levels. D. Discuss other options consumers can take to reduce exposure to lead in drinking water, such as alternative sources or treatment of water. E. Suggest that parents have their child’s blood tested for lead. 5. Explain why there are elevated levels of lead in the system’s drinking water (if known) and what the water system is doing to reduce the lead levels in homes/buildings in this area. 6. For more information, call us at [INSERT YOUR NUMBER] [(IF APPLICABLE), or visit our website at [INSERT YOUR WEBSITE HERE]]. For more information on reducing lead exposure around your home/building and the health effects of lead, visit U.S. Environmental Protection Agency’s (EPA’s) website at http://www.epa.gov/lead or contact your health care provider. (B) Community water systems. In addition to including the elements specified in subsection (1)(A) of this rule, community water systems must— 1. Tell consumers how to get their water tested; and 2. Discuss lead in plumbing components and the difference between low lead and lead free. (2) Delivery of public education materials. (A) For public water systems serving a large proportion of non-English speaking consumers, as determined by the department, the public education materials must contain information in the appropriate language(s) regarding the importance of the notice or contain a telephone number or address where persons served may contact the water system to obtain a translated copy of the public education materials or to request assistance in the appropriate language. (B) A community water system that exceeds the lead action level on the basis of tap water samples collected in accordance with 10 CSR 60-15.070, and that is not already conducting public education tasks under this section, must conduct the public education tasks under this section within sixty (60) days after the end of the monitoring period in which the exceedance occurred. 1. Deliver printed materials meeting the content requirements of section (1) of this rule to all bill paying customers. 2. Contact customers who are most at risk. A. Contact customers who are most at risk by delivering education materials that meet the content requirements of section (1) of this rule to local public health agencies even if they are not located within the water system’s service area, along with an informational notice that encourages distribution to all the organization’s potentially-affected customers or community water system’s users. The water system must contact the local public health agencies directly by phone or in person. The local public health agencies may provide a specific list of additional community based organizations serving target populations, which may include organizations outside the service area of the water system. If such lists are provided, systems must deliver educational materials that meet the content requirements of section (1) of this rule to all organizations on the provided lists. B. Contact customers who are most at risk by delivering materials that meet the content requirements of section (1) of this rule to the following organizations that are located within the water system’s service area, along with an informational notice that encourages distribution to all the organization’s potentially affected customers or community water system’s users: (I) Public and private schools or school boards; (II) Women, Infants, and Children (WIC) and Head Start programs; (III) Public and private hospitals and medical clinics; (IV) Pediatricians; (V) Family planning clinics; and (VI) Local welfare agencies. C. Make a good faith effort to locate the following organizations within the service area and deliver materials that meet the content requirements of section (1) of this rule to them, along with an informational notice that encourages distribution to all potentially-affected customers or users. The good faith effort to contact at-risk customers may include requesting a specific contact list of these organizations from the local public health agencies, even if the agencies are not located within the water system’s service area. (I) Licensed childcare centers. (II) Public and private preschools. (III) Obstetricians-gynecologists and midwives. 3. No less often than quarterly, provide information on or in each water bill as long as the system exceeds the action level for lead. The message on the water bill must include the following statement exactly as written except for the text in brackets for which the water system must include system-specific information: [INSERT NAME OF WATER SYSTEM] found high levels of lead in drinking water in some homes. Lead can cause serious health problems. For more information please call [INSERT NAME OF WATER SYSTEM] [or visit (INSERT YOUR WEBSITE HERE)]. The message or delivery mechanism can be modified in consultation with the department; specifically, the department may allow a separate mailing of public education materials to customers if the water system cannot place the information on water bills. 4. Post material meeting the content requirements of section (1) of this rule on the water system’s website if the system serves a population greater than one hundred thousand (100,000). 5. Submit a press release to newspapers, television stations, and radio stations. 6. In addition to paragraphs (2)(B)1. through 5. of this rule, systems must implement at least three (3) activities from one (1) or more categories listed below. The educational content and selection of these activities must be determined in consultation with the department. A. Public Service Announcements. B. Paid advertisements. C. Public area information displays. D. Emails to customers. E. Public meetings. F. Household deliveries. G. Targeted individual customer contact. H. Direct material distribution to all multi-family homes and institutions. I. Other methods approved by the department. 7. For systems that are required to conduct monitoring annually or less frequently, the end of the monitoring period is September 30 of the calendar year in which the sampling occurs, or, if the department has established an alternate monitoring period, the last day of that period. (C) As long as a community water system exceeds the action level, it must repeat the activities pursuant to subsection (2)(B) of this rule as described in paragraphs (2)(C)1. through 4. of this rule. 1. A community water system shall repeat the tasks contained in paragraphs (2)(B)1., 2., and 6. of this rule every twelve (12) months. 2. A community water system shall repeat tasks contained in paragraph (2)(B)3. of this rule with each billing cycle. 3. A community water system serving a population greater than one hundred thousand (100,000) shall post and retain material on a publicly accessible website pursuant to paragraph (2)(B)4. of this rule. 4. The community water system shall repeat the task in paragraph (2)(B)5. of this rule twice every twelve (12) months on a schedule agreed upon with the department. The department can allow activities in subsection (2)(B) of this rule to extend beyond the sixty- (60-) day requirement if needed for implementation purposes on a case-by-case basis; however, this extension must be approved in writing by the department in advance of the sixty- (60-) day deadline. (D) Within sixty (60) days after the end of the monitoring period in which the exceedance occurred (unless it already is repeating public education tasks pursuant to subsection (2)(E) of this rule), a non-transient non-community water system shall deliver the public education materials specified by section (1) of this rule as follows: 1. Post informational posters on lead in drinking water in a public place or common area in each of the buildings served by the system; and 2. Distribute informational pamphlets and/or brochures on lead in drinking water to each person served by the non-transient non-community water system. The department may allow the system to utilize electronic transmission in lieu of or combined with printed materials as long as it achieves at least the same coverage. 3. For systems that are required to conduct monitoring annually or less frequently, the end of the monitoring period is September 30 of the calendar year in which the sampling occurs, or, if the department has established an alternate monitoring period, the last day of that period. (E) A non-transient non-community water system shall repeat the tasks contained in subsection (2)(D) of this rule at least once during each calendar year in which the system exceeds the lead action level. The department can allow activities in subsection (2)(D) of this rule to extend beyond the sixty- (60-) day requirement if needed for implementation purposes on a case-by-case basis; however, this extension must be approved in writing by the department in advance of the sixty- (60-) day deadline. (F) A water system may discontinue delivery of public education materials if the system has met the lead action level during the most recent six- (6-) month monitoring period conducted pursuant to 10 CSR 60-15.070. Such a system shall recommence public education in accordance with this rule if it subsequently exceeds the lead action level during any monitoring period. (G) A community water system may apply to the department, in writing (unless the department has waived the requirement for prior department approval), to use only the text specified in subsection (1)(A) of this rule instead of the text in subsections (1)(A) and (1)(B) of this rule and to perform the tasks listed in subsections (2)(D) and (2)(E) of this rule instead of the tasks in subsections (2)(B) and (2)(C) of this rule if— 1. The system is a facility, such as a prison or a hospital, where the population served is not capable of or is prevented from making improvements to plumbing or installing point-of-use treatment devices; and 2. The system provides water as part of the cost of services provided and does not separately charge for water consumption. (H) A community water system serving three thousand three hundred (3,300) or fewer people may limit certain aspects of their public education programs as follows: 1. With respect to the requirements of paragraph (2)(B)6. of this rule, a system serving three thousand three hundred (3,300) or fewer people must implement at least one (1) of the activities listed in that paragraph; 2. With respect to the requirements of paragraph (2)(B)2. of this rule, a system serving three thousand three hundred (3,300) or fewer people may limit the distribution of the public education materials required under that paragraph to facilities and organizations served by the system that are most likely to be visited regularly by pregnant women and children; and 3. With respect to the requirements of paragraph (2)(B)5. of this rule, the department may waive this requirement for systems serving three thousand three hundred (3,300) or fewer people as long as the system distributes notices to every household served by the system. (3) Supplemental monitoring and notification of results. A water system that fails to meet the lead action level on the basis of tap samples collected in accordance with 10 CSR 60-15.070 shall offer to sample the tap water of any customer who requests it. The system is not required to pay for collecting or analyzing the sample, nor is the system required to collect and analyze the sample itself. (4) Notification of results. (A) Reporting requirement. All water systems must provide a notice of the individual tap results from lead tap water monitoring carried out under the requirements of 10 CSR 60-15.070 to the persons served by the water system at the specific sampling site from which the sample was taken (for example, the occupants of the residence where the tap was tested). (B) Timing of notification. A water system must provide the consumer notice as soon as practical, but no later than thirty (30) days after the system learns of the tap monitoring results. (C) Content. The consumer notice must include the results of lead tap water monitoring for the tap that was tested, an explanation of the health effects of lead, steps consumers can take to reduce exposure to lead in drinking water, and contact information for the water utility. The notice must also provide the maximum contaminant level goal and the action level for lead and the definitions for these two (2) terms from 10 CSR 60-2.015(2). (D) Delivery. The consumer notice must be provided to persons served at the tap that was tested, either by mail or by another method approved by the department. For example, upon approval by the department, a non-transient non-community water system could post the results on a bulletin board in the facility to allow users to review the information. The system must provide the notice to customers at sample taps tested, including consumers who do not receive water bills. AUTHORITY: section 640.100, RSMo Supp. 2011.* Original rule filed Aug. 4, 1992, effective May 6, 1993. Amended: Filed Aug. 14, 2001, effective April 30, 2002. Rescinded and readopted: Filed Oct. 17, 2011, effective May 30, 2012. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999, 2002, 2006. 10 CSR 60-15.070 Monitoring Requirements for Lead and Copper in Tap Water PURPOSE: This rule establishes the monitoring requirements which are applicable to lead and copper in drinking water. (1) Sample Site Location. A water system shall use the information on lead, copper, and galvanized steel that it is required to collect under this section when conducting a materials evaluation. When an evaluation of the information collected pursuant to this section is insufficient to locate the requisite number of lead and copper sampling sites that meet the targeting criteria in subsection (1)(A) of this rule, the water system shall review the sources of information listed in this rule in order to identify a sufficient number of sampling sites. In addition, the system shall seek to collect that information where possible in the course of its normal operations (for example, checking service line materials when reading water meters or performing maintenance activities); all plumbing codes, permits, and records in the files of the building department(s) which indicate the plumbing materials that are installed within publicly- and privately-owned structures connected to the distribution system; all inspections and records of the distribution system that indicate the material composition of the service connections that connect a structure to the distribution system; and all existing water quality information, which includes the results of all prior analyses of the system or individual structures connected to the system, indicating locations that may be particularly susceptible to high lead or copper concentrations. (A) By the applicable date for commencement of monitoring under subsection (4)(A) of this rule, each water system shall complete a materials evaluation of its distribution system in order to identify a pool of targeted sampling sites that meets the requirements of this section and which is sufficiently large to ensure that the water system can collect the number of lead and copper tap samples required in section (3) of this rule. All sites from which first-draw samples are collected shall be selected from this pool of targeted sampling sites. Sampling sites may not include faucets that have point-of-use or point-of-entry treatment devices designed to remove inorganic contaminants. (B) Community water supply systems shall identify whether the following construction materials are present in their distribution system: 1. Lead from piping, solder caulking, interior lining of distribution mains, alloys, and home plumbing; 2. Copper from piping and alloys, service lines, and home plumbing; 3. Ferrous piping materials, such as cast iron and steel; 4. Asbestos cement pipe; 5. Vinyl-lined asbestos cement pipe; and 6. Coal tar-lined pipes and tanks. (C) The sampling sites selected for a community water system’s sampling pool (tier 1 sampling sites) shall consist of single-family structures that contain copper pipes with lead solder installed after 1982, or contain lead pipes, or are served by a lead service line, or a combination of these. When multiple-family residences comprise at least twenty percent (20%) of the structures served by a water system, the system may include these types of structures in its sampling pool. (D) Any community water system with insufficient tier 1 sampling sites shall complete its sampling pool with tier 2 sampling sites, consisting of buildings, including multiple-family residences, that contain copper pipes with lead solder installed after 1982, or contain lead pipes, or are served by a lead service line, or a combination of these. (E) Any community water system with insufficient tier 1 and tier 2 sampling sites shall complete its sampling pool with tier 3 sampling sites, consisting of single-family structures that contain copper pipes with lead solder installed before 1983. A community water system with insufficient tier 1, tier 2, and tier 3 sampling sites shall complete its sampling pool with representative sites throughout the distribution system. A representative site is a site in which the plumbing materials used at that site would be commonly found at other sites served by the water system. (F) The sampling sites selected for a nontransient non-community water system (tier 1 sampling sites) shall consist of buildings that contain copper pipes with lead solder installed after 1982, or contain lead pipes, or are served by a lead service line, or a combination of these. (G) A non-transient non-community water system with insufficient tier 1 sites that meet the targering criteria in subsection (1)(F) of this rule shall complete its sampling pool with sampling sites that contain copper pipes with lead solder installed before 1983. If additional sites are needed to complete the sampling pool, the non-transient non-community water system shall use representative sites throughout the distribution system. A representative site is a site in which the plumbing materials used at that site would be commonly found at other sites served by the water system. (H) Any water system whose distribution system contains lead service lines shall draw fifty percent (50%) of the samples it collects during each monitoring period from sites that contain lead pipes or copper pipes with lead solder and fifty percent (50%) of those samples from sites served by a lead service line. A water system that cannot identify a sufficient number of sampling sites served by a lead service line shall collect first-draw samples from all of the sites identified as being served by these lines. (2) Sample Collection Methods. (A) All tap samples for lead and copper collected in accordance with this rule, with the exception of lead service line samples collected under 10 CSR 60-15.050(3) and samples collected under subsection (2)(E) of this rule, shall be first-draw samples. (B) Each first-draw tap sample for lead and copper shall be one (1) liter in volume and have stood motionless in the plumbing system of each sampling site for at least six (6) hours. First-draw samples from residential housing shall be collected from the cold-water kitchen tap or bathroom sink tap. First-draw samples from a nonresidential building shall be one (1) liter in volume and shall be collected at an interior tap from which water is typically drawn for consumption. Non-first-draw samples collected in lieu of first-draw samples pursuant to subsection (2)(E) of this rule shall be one (1) liter in volume and shall be collected at an interior tap from which water is typically drawn for consumption. First-draw samples may be collected by the system or the system may allow residents to collect first-draw samples after instructing the residents of the sampling procedures specified in this section. To avoid problems of residents handling nitric acid, acidification of first-draw samples may be done up to fourteen (14) days after the sample is collected. After acidification to resolubilize the metals, the sample must stand in the original container for the time specified in the approved United States Environmental Protection Agency (U.S. EPA) method before the sample can be analyzed. If a system allows residents to perform sampling, the system may not challenge, based on alleged errors in sample collection, the accuracy of sampling results. (C) Each service line sample shall be one (1) liter in volume and have stood motionless in the lead service line for at least six (6) hours. Lead service line samples shall be collected in one (1) of the following three (3) ways: 1. At the tap after flushing the volume of water between the tap and the lead service line. The volume of water shall be calculated based on the interior diameter and length of the pipe between the tap and the lead service line; 2. Tapping directly into the lead service line; or 3. If the sampling site is a building constructed as a single-family residence, allowing the water to run until there is a significant change in temperature which would be indicative of water that has been standing in the lead service line. (D) A water system shall collect each first-draw tap sample from the same sampling site from which it collected a previous sample. If, for any reason, the water system cannot gain entry to a sampling site in order to collect a follow-up tap sample, the system may collect the follow-up tap sample from another sampling site in its sampling pool as long as the new site meets the same targeting criteria and is within reasonable proximity of the original site. (E) A non-transient non-community water system, or a community water system that meets the criteria of 10 CSR 60-15.060(2)(E), that does not have enough taps that can supply first-draw samples as defined in 10 CSR 60-2.015 may, with department approval, apply substitute non-first-draw samples. Such systems shall collect as many first-draw samples from appropriate taps as possible and identify sampling times and locations that would likely result in the longest standing time for the remaining sites. (3) Number of Samples. Water systems shall collect at least one (1) sample during each monitoring period specified in subsection (4)(D) of this rule from the number of sites listed in the second column (“Standard Monitoring”) of Table 1. A system conducting reduced monitoring under subsection (4)(D) of this rule shall collect at least one (1) sample from the number of sites specified in the third column (“Reduced Monitoring”) of Table 1 during each monitoring period specified in subsection (4)(D) of this rule. Such reduced monitoring sites shall be representative of the sites required for standard monitoring. A public water system that has fewer than five (5) drinking water taps that can be used for human consumption meeting the sample site criteria of section (1) of this rule to reach the required number of sample sites listed in section (3) of this rule must collect at least one (1) sample from each tap and then must collect additional samples from those taps on different days during the monitoring period to meet the required number of sites. Alternatively the department may allow these public water systems to collect a number of samples less than the number of sites specified in section (3) of this rule, provided that one-hundred percent (100%) of all taps that can be used for human consumption are sampled. The department must approve this reduction of the minimum number of samples in writing based on a request from the system or onsite verification by the department. The department may specify sampling locations when a system is conducting reduced monitoring. Table 1. System Size Number of Sites Number of Sites (# People (Standard (Reduced Served) Monitoring) Monitoring) >100,000 100 50 10,001–100,000 60 30 3,301–10,000 40 20 501–3,300 20 10 101–500 10 5 £ð1 0 0 5 5 ( 4 ) T i m i n g o f M o n i t o r i n g . ( A ) I n i t i a l T a p S a m p l i n g . T h e f i r s t s i x - ( 6 - ) m o n t h m o n i t o r i n g p e r i o d f o r s m a l l ( s e r v i n g l e s s t h a n o r e q u a l t o t h r e e t h o u s a n d t h r e e h u n d r e d ( 3 , 3 0 0 ) p e r s o n s ) , m e d i u m - s i z e ( s e r v i n g t h r e e t h o u s a n d t h r e e h u n d r e d o n e t o f i f t y thousand (3,301–50,000) persons) and large (serving more than fifty thousand (>50,000) persons) systems shall begin on the following dates: First Six- (6-) Month Monitoring Period System Size Begins On (# People Served) >50,000 January 1, 1992 3,301–50,000 July 1, 1992 £ð3 , 3 0 0 J u l y 1 , 1 9 9 3 1 . A l l l a r g e s y s t e m s s h a l l m o n i t o r d u r i n g t w o ( 2 ) c o n s e c u t i v e s i x - ( 6 - ) m o n t h p e r i o d s . 2 . A l l s m a l l - a n d m e d i u m - s i z e s y s t e m s s h a l l m o n i t o r d u r i n g e a c h s i x - ( 6 - ) m o n t h m o n i t o r i n g p e r i o d u n t i l t h e s y s t e m A . E x c e e d s t h e l e a d o r c o p p e r action level and is therefore required to implement the corrosion control treatment requirements under 10 CSR 60-15.020, in which case the system shall continue monitoring in accordance with subsection (4)(B) of this rule; or B. Meets the lead and copper action levels during two (2) consecutive six- (6-) month monitoring periods, in which case the system may reduce monitoring in accordance with subsection (4)(D) of this rule. (B) Monitoring After Installation of Corrosion Control and Source Water Treatment. 1. Any large system which installs optimal corrosion control treatment pursuant to 10 CSR 60-15.020(1)(A)4. shall monitor during two (2) consecutive six- (6-) month monitoring periods by the date specified in 10 CSR 60-15.020(1)(A)5. 2. Any small- or medium-size system which installs optimal corrosion control treatment pursuant to 10 CSR 60-15.020(2)(A)5. shall monitor during two (2) consecutive six- (6-) month monitoring periods by the date specified in 10 CSR 60-15.020(2)(A)6. 3. Any system which installs source water treatment pursuant to 10 CSR 60-15.040(1)(C) shall monitor during two (2) consecutive six- (6-) month monitoring periods by the date specified in 10 CSR 60-15.040(1)(D). (C) After the department specifies the values for water quality control parameters under 10 CSR 60-15.030(6), the system shall monitor during each subsequent six- (6-) month monitoring period, with the first monitoring period to begin on the date the department specifies the optimal values under 10 CSR 60-15.030(6). (D) Reduced Monitoring. 1. A small- or medium-size water system that meets the lead and copper action levels during each of two (2) consecutive six- (6-) month monitoring periods may reduce the number of samples in accordance with section (3) of this rule and reduce the frequency of sampling to once per year. A small- or medium-size water system collecting fewer than five (5) samples, as specified in section (3) of this rule, that meets the lead and copper action levels during each of two (2) consecutive six- (6-) month monitoring periods may reduce the frequency of sampling to once per year. In no case can the system reduce the number of samples required below the minimum of one (1) sample per available tap. This sampling shall begin during the calendar year immediately following the end of the second consecutive six- (6-) month monitoring period. 2. Any water system that meets the lead action level and maintains the range of values for the water quality control parameters reflecting optimal corrosion control treatment specified under 10 CSR 60-15.030(7) during each of two (2) consecutive six- (6-) month monitoring periods may reduce the frequency of monitoring to once per year and reduce the number of lead and copper samples in accordance with section (3) of this rule if it receives written approval from the department. This sampling shall begin during the calendar year immediately following the end of the second consecutive six- (6-) month monitoring period. The department shall review monitoring, treatment, and other relevant information submitted by the water system in accordance with 10 CSR 60-7.020 and shall notify the system in writing when it determines the system is eligible to commence reduced monitoring pursuant to this section. The department shall review and, where appropriate, revise its determination when the system submits new monitoring or treatment data or when other data relevant to the number and frequency of tap sampling becomes available. 3. A small- or medium-size water system that meets the lead and copper action levels during three (3) consecutive years of monitoring may reduce the frequency of monitoring for lead and copper from annually to once every three (3) years. Any water system that meets the lead action level and maintains the range of values for the water quality control parameters reflecting optimal corrosion control treatment specified by the department under 10 CSR 60-15.030(6) during three (3) consecutive years of monitoring may reduce the frequency of monitoring from annually to once every three (3) years if it receives written approval from the department. Samples collected once every three (3) years shall be collected no later than every third calendar year. The department shall review monitoring, treatment, and other relevant information submitted by the water system in accordance with 10 CSR 60-7.020 and shall notify the system in writing when it determines the system is eligible to reduce the frequency of monitoring to once every three (3) years. The department shall review and, where appropriate, revise its determination when the system submits new monitoring or treatment data or when other data relevant to the number and frequency of tap sampling becomes available. 4. A water system that reduces the number and frequency of sampling shall collect these samples from representative sites included in the pool of targeted sampling sites identified in section (1) of this rule. Systems sampling annually or less frequently shall conduct the lead and copper tap sampling during the months of June, July, August, or September unless the department has approved a different sampling period. A. The department, at its discretion, may approve a different period for conducting the lead and copper tap sampling for systems collecting a reduced number of samples. Such a period shall be no longer than four (4) consecutive months and must represent a time of normal operation where the highest levels of lead are most likely to occur. For a non-transient non-community water system that does not operate during the months of June through September, and for which the period of normal operation where the highest levels of lead are most likely to occur is not known, the department shall designate a period that represents a time of normal operation for the system. This sampling shall begin during the period approved or designated by the department in the calendar year immediately following the end of the second consecutive six- (6-) month monitoring period for systems initiating annual monitoring and during the three- (3-) year period following the end of the third consecutive calendar year of annual monitoring for systems initiating triennial monitoring. B. Systems monitoring annually, that have been collecting samples during the months of June through September and that receive department approval to alter their sample collection period, must collect their next round of samples during a time period that ends no later than twenty-one (21) months after the previous round of sampling. Systems monitoring triennially, that have been collecting samples during the months of June through September and receive department approval to alter the sampling collection period, must collect their next round of samples during a time period that ends no later than forty-five (45) months after the previous round of sampling. Subsequent rounds of sampling must be collected annually or triennially, as required by this section. Small systems with waivers, granted pursuant to section (6) of this rule, that have been collecting samples during the months of June through September and receive department approval to alter their sample collection period must collect their next round of samples before the end of the nine- (9-) year period. 5. Any water system that demonstrates for two (2) consecutive six- (6-) month monitoring periods that the tap water lead level computed under 10 CSR 60-15.010(3)(C) is less than or equal to 0.005 mg/L and the tap water copper level computed under 10 CSR 60-15.010(3)(C) is less than or equal to 0.65 mg/L may reduce the number of samples in accordance with section (3) of this rule and reduce the frequency of sampling to once every three (3) calendar years. 6. A small- or medium-size water system subject to reduced monitoring that exceeds the lead or copper action level shall resume sampling in accordance with subsection (4)(C) of this rule and collect the number of samples specified for standard monitoring under section (3) of this rule. Such a system shall also conduct water quality parameter monitoring in accordance with 10 CSR 60-15.080(2), (3), or (4) (as appropriate) during the monitoring period in which it exceeded the action level. Any such system may resume annual monitoring for lead and copper at the tap at the reduced number of sites specified in section (3) of this rule after it has completed two (2) subsequent consecutive six- (6-) month rounds of monitoring that meet the criteria of paragraph (4)(d)1. of this rule and/or may resume triennial monitoring for lead and copper at the reduced number of sites after it demonstrates through subsequent rounds of monitoring that it meets the criteria of either paragraph (4)(D)2. or (4)(D)5. of this rule. A. Any water system subject to the reduced monitoring frequency that fails to meet the lead action level during any four- (4-) month monitoring period or that fails to operate at or above the minimum value or within the range of values for the water quality parameters specified by the department under 10 CSR 60-15.080(6) for more than nine (9) days in any six- (6-) month period specified in 10 CSR 60-15.080(4) shall conduct tap water sampling for lead and copper at the frequency specified in subsection (4)(C) of this rule, collect the number of samples specified for standard monitoring under section (3) of this rule, and resume reduced monitoring for water quality parameters within the distribution system in accordance with 10 CSR 60-15.080(4). This standard tap water sampling shall begin no later than the six- (6-) month period beginning January 1 of the calendar year following the lead action level exceedance or water quality parameter excursion. Such a system may resume reduced monitoring for lead and copper at the tap and for water quality parameters within the distribution system under the following conditions: (I) The system may resume annual monitoring for lead and copper at the tap at the reduced number of sites specified in section (3) of this rule after it has completed two (2) subsequent six- (6-) month rounds of monitoring that meet the criteria of paragraph (4)(D)2. of this rule and the system has received written approval from the department that it is appropriate to resume reduced monitoring on an annual frequency. This sampling shall begin during the calendar year immediately following the end of the second consecutive six- (6-) month monitoring period; (II) The system may resume triennial monitoring for lead and copper at the tap at the reduced number of sites after it demonstrates through subsequent rounds of monitoring that it meets the criteria of either paragraph (4)(D)3. or (4)(D)5. of this rule and the system has received written approval from the department that it is appropriate to resume triennial monitoring; and (III) The system may reduce the number of water quality parameter tap water samples required in accordance with 10 CSR 60-15.080(5)(A) and the frequency with which it collects such samples in accordance with 10 CSR 60-15.080(5)(B). Such a system may not resume triennial monitoring for water quality parameters at the tap until it demonstrates, in accordance with the requirements of 10 CSR 60-15.080(5)(B), that it has requalified for triennial monitoring. 7. Any water system subject to the reduced monitoring frequency that fails to operate at or above the minimum value or within the range of values for the water quality parameters specified by the department under 10 CSR 60-15.030(6) for more than nine (9) days in any six- (6-) month period specified in 10 CSR 60-15.080(4) shall conduct tap water sampling for lead and copper at the frequency specified in subsection (4)(C) of this rule, collect the number of samples specified for standard monitoring under section (3) of this rule, and resume monitoring for water quality parameters within the distribution system in accordance with 10 CSR 60-15.030(4). Any water system subject to a reduced monitoring frequency under subsection (4)(D) of this rule shall notify the department in writing in accordance with 10 CSR 60-7.020(3)(C) of any upcoming long-term change in treatment or addition of a new source as described in that rule. The department must review and approve the addition of a new source or long-term change in water treatment before it is implemented by the water system. Such a system may resume reduced monitoring for lead and copper at the tap and for water quality parameters within the distribution system under the following conditions: A. The system may resume annual monitoring for lead and copper at the tap at the reduced number of sites specified in section (3) of this rule after it has completed two (2) subsequent six- (6-) month rounds of monitoring that meet the criteria of paragraph (4)(D)2. of this rule and the system has received written approval from the department that it is appropriate to resume reduced monitoring on an annual frequency; B. The system may resume triennial monitoring for lead and copper at the tap at the reduced number of sites after it demonstrates through subsequent rounds of monitoring that it meets the criteria of either paragraph (4)(D)3. or (4)(D)5. of this rule and the system has received written approval from the department that it is appropriate to resume triennial monitoring; and C. The system may reduce the number of water quality parameter tap water samples required in accordance with 10 CSR 60-15.080(5)(A) and the frequency with which it collects such samples in accordance with 10 CSR 60-15.080(5)(B). Such a system may not resume triennial monitoring for water quality parameters at the tap until it demonstrates, in accordance with the requirements of 10 CSR 60-15.080(5)(B)2., that it has requalified for triennial monitoring. 8. Any water system subject to a reduced monitoring frequency under subsection (4)(D) of this rule that either adds a new source of water or changes any water treatment shall inform the department in writing in accordance with 10 CSR 60-7.020(1)(C). The department may require the system to resume sampling in accordance with subsection (4)(C) of this rule and collect the number of samples specified for standard monitoring in Table 1 of section (3) of this rule or take other appropriate steps such as increased water quality parameter monitoring or reevaluation of its corrosion control treatment given the potentially different water quality considerations. (5) The results of any monitoring conducted, in addition to the minimum requirements of this section, shall be considered by the system and the department in making any determinations (that is, calculating the ninetieth percentile lead or copper level) under this rule. (6) Invalidation of Lead or Copper Tap Water Samples. A sample invalidated under this section does not count toward determining lead or copper ninetieth percentile levels under 10 CSR 60-15.010(3)(C) or toward meeting the minimum monitoring requirements of Table 1 in section (3) of this rule. (A) The department may invalidate a lead or copper tap water sample if one (1) of the following conditions is met: 1. The laboratory establishes that improper sample analysis caused erroneous results; 2. The department determines that the sample was taken from a site that did not meet the site selection criteria of this rule; 3. The sample container was damaged in transit; or 4. There is substantial reason to believe that the sample was subject to tampering. (B) The system must report the results of all samples to the department and all supporting documentation for samples the system believes should be invalidated. (C) To invalidate a sample under subsection (6)(A) of this rule, the decision and the rationale for the decision must be documented in writing. The department shall not invalidate a sample solely on the grounds that a follow-up sample result is higher or lower than that of the original sample. (D) The water system must collect replacement samples for any samples invalidated under this section if, after the invalidation of one (1) or more samples, the system has too few samples to meet the minimum requirements of section (3) of this rule. Any such replacement samples must be taken as soon as possible, but no later than twenty (20) days after the date the department invalidates the sample or by the end of the applicable monitoring period, whichever occurs later. Replacement samples taken after the end of the applicable monitoring period shall not also be used to meet the monitoring requirements of a subsequent monitoring period. The replacement samples shall be taken at the same locations as the invalidated samples or, if that is not possible, at locations other than those already used for sampling during the monitoring period. (7) Monitoring Waivers for Small Systems. Any small system that meets the criteria of this section may apply to the department to reduce the frequency of monitoring for lead and copper under this section to once every nine (9) years (that is, a “full waiver”) if it meets all of the materials criteria specified in subsection (7)(A) of this rule and all of the monitoring criteria specified in subsection (7)(B) of this rule. Any small system that meets the criteria in subsections (7)(A) and (B) of this rule only for lead, or only for copper, may apply to the department for a waiver to reduce the frequency of tap water monitoring to once every nine (9) years for that contaminant only (that is, a “partial waiver”). (A) Materials Criteria. The system must demonstrate that its distribution system and service lines and all drinking water supply plumbing, including plumbing conveying drinking water within all residences and buildings connected to the system, are free of lead-containing materials and/or copper-containing materials, as those terms are defined here, as follows: 1. Lead. To qualify for a full waiver, or a waiver of the tap water monitoring requirements for lead (that is, a “lead waiver”), the water system must provide certification and supporting documentation to the department that the system is free of all lead-containing materials, as follows: A. It contains no plastic pipes which contain lead plasticizers, or plastic service lines which contain lead plasticizers; and B. It is free of lead service lines, lead pipes, lead soldered pipe joints, and leaded brass or bronze alloy fittings and fixtures, unless such fittings and fixtures meet the specifications of any standard established pursuant to 42 U.S.C. 300g–6(e) (SDWA section 1417(e)). 2. Copper. To qualify for a full waiver, or a waiver of the tap water monitoring requirements for copper (that is, a “copper waiver”), the water system must provide certification and supporting documentation to the department that the system contains no copper pipes or copper service lines. (B) Monitoring Criteria for Waiver Issuance. The system must have completed at least one (1) six- (6-) month round of standard tap water monitoring for lead and copper at sites approved by the department and from the number of sites required by Table 1 of section (3) of this rule and demonstrate that the ninetieth percentile levels for any and all rounds of monitoring conducted since the system became free of all lead-containing and/or copper-containing materials, as appropriate, meet the following criteria. 1. Lead levels. To qualify for a full waiver, or a lead waiver, the system must demonstrate that the ninetieth percentile lead level does not exceed 0.005 mg/l. 2. Copper levels. To qualify for a full waiver, or a copper waiver, the system must demonstrate that the ninetieth percentile copper level does not exceed 0.65 mg/l. (C) Department Approval of Waiver Application. The department shall notify the system of its waiver determination, in writing, setting forth the basis of its decision and any condition of the waiver. As a condition of the waiver, the department may require the system to perform specific activities (e.g., limited monitoring, periodic outreach to customers to remind them to avoid installation of materials that might void the waiver) to avoid the risk of lead or copper concentration of concern in tap water. The small system must continue monitoring for lead and copper at the tap as required by subsections (4)(A)–(D) of this rule, as appropriate, until it receives written notification from the department that the waiver has been approved. (D) Monitoring Frequency for Systems with Waivers. 1. A system with a full waiver must conduct tap water monitoring for lead and copper in accordance with paragraph (4)(D)4. of this rule at the reduced number of sampling sites identified in Table 1 of section (3) of this rule at least once every nine (9) years and provide the materials certification specified in subsection (7)(A) of this rule for both lead and copper to the department along with the monitoring results. Samples collected every nine (9) years shall be collected no later than every ninth calendar year. 2. A system with a partial waiver must conduct tap water monitoring for the waived contaminant in accordance with paragraph (4)(D)4. of this rule at the reduced number of sampling sites specified in Table 1 of section (3) of this rule at least once every nine (9) years and provide the materials certification specified in subsection (7)(A) of this rule pertaining to the waived contaminant along with the monitoring results. Such a system also must continue to monitor for the non-waived contaminant in accordance with requirements of subsections (4)(A) through (4)(D) of this rule, as appropriate. 3. If a system with a full or partial waiver adds a new source of water or changes any water treatment, the system must notify the department in writing in accordance with 10 CSR 60-7.020(1)(C). Any water system with a full or partial waiver shall notify the department in writing in accordance with 10 CSR 60-7.020(1)(C) of any upcoming long-term change in treatment or addition of a new source, as described in that rule. The department must review and approve the addition of a new source or long-term change in water treatment before it is implemented by the water system. The department may require the system to add or modify waiver conditions (e.g., require recertification that the system is free of lead-containing and/or copper-containing materials, require additional round(s) of monitoring), if it deems such modifications are necessary to address treatment or source water changes at the system. 4. If a system with a full or partial waiver becomes aware that it is no longer free of lead-containing or copper-containing materials (for example, as a result of new construction or repairs), the system shall notify the department in writing no later than sixty (60) days after becoming aware of such a change. (E) Continued Eligibility. If the system continues to satisfy the requirements of subsection (7)(D) of this rule, the waiver will be renewed automatically, unless any of the conditions listed in paragraph (7)(E)1.–3. of this rule occurs. A system whose waiver has been revoked may reapply for a waiver at such time as it again meets the appropriate materials and monitoring criteria of subsections (7)(A) and (7)(B) of this rule. 1. A system with a full waiver or a lead waiver no longer satisfies the materials criteria of paragraph (7)(A)1. of this rule or has a ninetieth percentile lead level greater than 0.005 mg/l. 2. A system with a full waiver or a copper waiver no longer satisfies the materials criteria of paragraph (7)(A)2. of this rule or has a ninetieth percentile copper level greater than 0.65 mg/l. 3. The department notifies the system, in writing, that the waiver has been revoked, setting forth the basis of its decision. (F) Requirements Following Waiver Revocation. A system whose full or partial waiver has been revoked by the department is subject to the corrosion control treatment and lead and copper tap water monitoring requirements, as follows: 1. If the system exceeds the lead and/or copper action level, the system must implement corrosion control treatment in accordance with the deadlines specified in 10 CSR 60-15.010(5), and any other applicable requirements of this subpart. 2. If the system meets both the lead and the copper action level, the system must monitor for lead and copper at the tap no less frequently than once every three (3) years using the reduced number of sample sites specified in Table 1 of section (3) of this rule. (G) Pre-existing Waivers. Small system waivers approved by the department in writing prior to April 11, 2000, shall remain in effect under the following conditions: 1. If the system has demonstrated that it is both free of lead-containing and copper-containing materials, as required by subsection (7)(A) of this rule and that its ninetieth percentile lead levels and ninetieth percentile copper levels meet the criteria of subsection (7)(B) of this rule, the waiver remains in effect so long as the system continues to meet the waiver eligibility criteria of subsection (7)(E) of this rule. The first round of tap water monitoring conducted pursuant to subsection (7)(D) of this rule shall be completed no later than nine (9) years after the last time the system has monitored for lead and copper at the tap. 2. Reserved. AUTHORITY: section 640.100, RSMo Supp. 2011.* Original rule filed Aug. 4, 1992, effective May 6, 1993. Amended: Filed Feb. 1, 1996, effective Oct. 30, 1996. Amended: Filed Aug. 14, 2001, effective April 30, 2002. Amended: Filed Oct. 17, 2011, effective May 30, 2012. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999, 2002, 2006. 10 CSR 60-15.080 Monitoring Requirements for Water Quality Parameters PURPOSE: This rule sets forth the procedures and requirements for monitoring drinking water to determine how corrosive the water is to the distribution system. (1) General Requirement s . A l l l a r g e ( s e r v i n g m o r e t h a n f i f t y t h o u s a n d ( > 5 0 , 0 0 0 ) p e r s o n s ) w a t e r s y s t e m s a n d a l l s m a l l - ( s e r v i n g l e s s t h a n o r e q u a l t o t h r e e t h o u s a n d t h r e e h u n d r e d ( £ð3 , 3 0 0 ) p e r s o n s ) a n d m e d i u m - s i z e ( s e r v i n g t h r e e t h o u s a n d t h r e e h u n d r e d o n e t o f i f t y t h o u s a n d ( 3 , 3 0 1 50,000) persons) systems that exceed the lead or copper action level shall monitor water quality parameters in addition to lead and copper in accordance with this rule. The requirements of this rule are summarized in the table at the end of this rule. (A) Sample Collection Methods. 1. Tap samples shall be representative of water quality throughout the distribution system taking into account the number of persons served, the different sources of water, the different treatment methods employed by the system and seasonal variability. Tap sampling under this rule is not required to be conducted at taps targeted for lead and copper sampling under 10 CSR 60-15.070(1). (Note: Systems may find it convenient to conduct tap sampling for water quality parameters at sites used for coliform sampling under 10 CSR 60-4.020(1)(A).) 2. Samples collected at the entry point(s) to the distribution system shall be from locations representative of each source after treatment. If a system draws water from more than one (1) source a n d t h e s o u r c e s a r e c o m b i n e d b e f o r e d i s t r i b u t i o n , t h e s y s t e m m u s t s a m p l e a t a n e n t r y p o i n t t o t h e d i s t r i b u t i o n s y s t e m d u r i n g p e r i o d s o f n o r m a l o p e r a t i n g c o n d i t i o n s ( t h a t i s , w h e n w a t e r i s r e p r e s e n t a t i v e o f a l l s o u r c e s b e i n g u s e d ) . ( B ) N u m b e r o f S a m p l e s . 1 . Systems shall collect two (2) tap samples for applicable water quality parameters during each monitoring period specified under sections (2)–(5) of this rule from the following number of sites: Sites for Water System Size Quality Parameters (# People Served) (Number) >100,000 25 10,001–100,000 10 3,301–10,000 3 501–3,300 2 101–500 1 £ð1 0 0 1 2 . E x c e p t a s p r o v i d e d i n s u b s e c t i o n ( 3 ) ( C ) o f t h i s r u l e , s y s t e m s s h a l l c o l l e c t t w o ( 2 ) s a m p l e s f o r e a c h a p p l i c a b l e w a t e r q u a l i t y p a r a m e t e r a t e a c h e n t r y p o i n t t o t h e d i s t r i b u t i o n s y s t e m d u r i n g e a c h m o n i t o r i n g p e r i o d s p e c i f i e d i n s e c t i o n ( 2 ) o f t h i s rule. During each monitoring period specified in sections (3)–(5) of this rule, systems shall collect one (1) sample for each applicable water quality parameter at each entry point to the distribution system. (2) Initial Sampling. All large (serving more than fifty thousand (>50,000) persons) water systems shall measure the applicable water quality parameters as specified in this rule at taps and at each entry point to the distribution system during each six- (6-) month monitoring period specified in 10 CSR 6 0 - 1 5 . 0 7 0 ( 4 ) ( A ) . A l l s m a l l ( s e r v i n g l e s s t h a n o r e q u a l t o t h r e e t h o u s a n d t h r e e h u n d r e d ( £ð3 , 3 0 0 ) p e r s o n s ) a n d m e d i u m - s i z e ( s e r v i n g t h r e e t h o u s a n d t h r e e h u n d r e d o n e t o f i f t y t h o u s a n d ( 3 , 3 0 1 5 0 , 0 0 0 ) p e r s o n s ) s y s t e m s s h a l l m e a s u r e t h e a p p l i c a b l e w a t e r q u a l i t y parameters at the locations specified as follows during each six- (6-) month monitoring period specified in 10 CSR 60-15.070(4)(A) during which the system exceeds the lead or copper action level: (A) At taps— 1. pH; 2. Alkalinity; 3. Orthophosphate, when an inhibitor containing a phosphate compound is used; 4. Silica, when an inhibitor containing a silicate compound is used; 5. Calcium; 6. Conductivity; and 7. Water temperature; and (B) At each entry point to the distribution system, all of the applicable parameters listed in subsection (2)(A) of this rule. (3) Monitoring After Installation of Corrosion Control. Any large system which installs optimal corrosion control treatment pursuant to 10 CSR 60-15.020(1)(A)4. shall measure the water quality parameters at the locations and frequencies specified in this section during each six- (6-) month monitoring period specified in 10 CSR 60-15.070(4)(B)1. Any small- or medium-size system which installs optimal corrosion control treatment shall conduct monitoring during each six- (6-) month monitoring period as specified in 10 CSR 60-15.070(4)(B)2. in which the system exceeds the lead or copper action level. (A) At taps, two (2) samples for— 1. pH; 2. Alkalinity; 3. Orthophosphate, when an inhibitor containing a phosphate compound is used; 4. Silica, when an inhibitor containing a silicate compound is used; and 5. Calcium, when calcium carbonate stabilization is used as part of corrosion control. (B) Except as provided in subsection (3)(C) of this rule, at each entry point to the distribution system, at least one (1) sample no less frequently than every two (2) weeks (bi-weekly)— 1. For pH; 2. When alkalinity is adjusted as part of optimal corrosion control, a reading of the dosage rate of the chemical used to adjust alkalinity and the alkalinity concentration; and 3. When a corrosion inhibitor is used as part of optimal corrosion control, a reading of the dosage rate of the inhibitor used and the concentration of orthophosphate or silica (whichever is applicable). (C) Any groundwater system can limit entry point sampling described in subsection (3)(B) of this rule to those entry points that are representative of water quality and treatment conditions throughout the system. If water from untreated groundwater sources mixes with water from treated groundwater sources, the system must monitor for water quality parameters both at representative entry points receiving treatment and representative entry points receiving no treatment. Prior to the start of any monitoring under this subsection, the system shall provide to the department written information identifying the selected entry points and documentation, including information on seasonal variability, sufficient to demonstrate that the sites are representative of water quality and treatment conditions throughout the system. (4) Monitoring After Department Specifies Water Quality Parameter Values for Optimal Corrosion Control. After the department specifies the values for applicable water quality control parameters reflecting optimal corrosion control treatment under 10 CSR 60-15.030(7), all large (serving more than fifty thousand (>50,000) persons) systems shall measure the applicable water quality parameters in accordance with section (3) of this rule and determine compliance with the requirements of 10 CSR 60-15.030(8) every six (6) months with the first six- (6-) month period to begin on either January 1 or July 1, whichever comes first, after the department specifies the optimal values under 10 CSR 60-15.030(7). Any small- (serving less than three thousand three hundred (<3,300) persons) or medium-size (serving three thousand three hundred one to fifty thousand (3,301–50,000) persons) system shall conduct such monitoring during each six- (6-) month period specified in 10 CSR 60-15.070(4)(C) in which the system exceeds the lead or copper action level. For any such small- and medium-size system that is subject to a reduced monitoring frequency pursuant to 10 CSR 60-15.070(4)(D) at the time of the action level exceedance, the start of the applicable six- (6-) month period under this section shall coincide with the start of the applicable monitoring period under 10 CSR 60-15.070(4)(D). Compliance with department-designated optimal water quality parameter values shall be determined as specified under 10 CSR 60-15.030(8). (5) Reduced Monitoring. (A) Any water system that maintains the range of values for the water quality parameters reflecting optimal corrosion control treatment during each of two (2) consecutive six- (6-) month monitoring periods under section (4) of this rule shall continue monitoring at the entry point(s) to the distribution system as specified in subsection (3)(B) of this rule. That system may collect two (2) tap samples for applicable water quality parameters from the following reduced number of sites during each six- (6-) month monitoring period. Sites for System Size Water Quality Parameters (# People Served) (Reduced Number) >100,000 10 10,001–100,000 7 3,301–10,000 3 501–3,300 2 10 1 5 0 0 1 £ð1 0 0 1 ( B ) A n y w a t e r s y s t e m t h a t m a i n t a i n s t h e r a n g e o f v a l u e s f o r t h e w a t e r q u a l i t y p a r a m e t e r s r e f l e c t i n g o p t i m a l c o r r o s i o n c o n t r o l t r e a t m e n t s p e c i f i e d b y t h e d e p a r t m e n t u n d e r 1 0 C S R 6 0 - 1 5 . 0 3 0 ( 6 ) d u r i n g t h r e e ( 3 ) c o n s e c u t i v e y e a r s o f a n n u a l m o n itoring under this subsection may reduce the frequency with which it collects the number of tap samples for applicable water quality parameters specified in subsection (5)(A) of this rule from every six (6) months to annually. This sampling begins during the calendar year immediately following the end of the monitoring period in which the third consecutive year of six- (6-) month monitoring occurs. Any water system that maintains the range of values for the water quality parameters reflecting optimal corrosion control treatment specified by the department under 10 CSR 60-15.030(6) during three (3) consecutive years of annual monitoring under this rule may reduce the frequency with which it collects the number of tap samples for applicable water quality parameters specified in section (6) of this rule from annually to every three (3) years. This sampling begins no later than the third calendar year following the end of the monitoring period in which the third consecutive year of monitoring occurs. A water system may reduce the frequency with which it collects tap samples for applicable water quality parameters specified in subsection (5)(A) of this rule to every three (3) years if it demonstrates during two (2) consecutive monitoring periods that its tap water lead level at the ninetieth percentile is less than or equal to the PQL for lead specified in 10 CSR 60-5.010(5)(H), that its tap water copper level at the ninetieth percentile is less than or equal to 0.65 mg/L for copper, and that it also has maintained the range of values for the water quality parameters reflecting optimal corrosion control treatment specified by the department under 10 CSR 60-15.030(7). Monitoring conducted every three (3) years shall be done no later than every third calendar year. (C) A water system that conducts sampling annually shall collect these samples evenly throughout the year so as to reflect seasonal variability. (D) Any water system subject to the reduced monitoring frequency that fails to operate at or above the minimum value or within the range of values for the water quality parameters specified by the department in 10 CSR 60-15.030(7) for more than nine (9) days in any six- (6-) month period specified in 10 CSR 60-15.030(8) shall resume distribution system tap water sampling in accordance with the number and frequency requirements in section (4) of this rule. Such a system may resume annual monitoring for water quality parameters at the tap at the reduced number of sites specified in subsection (5)(A) of this rule after it has completed two (2) subsequent consecutive six- (6-) month rounds of monitoring that meet the criteria of that paragraph and/or may resume triennial monitoring for water quality parameters at the tap at the reduced number of sites after it demonstrates through subsequent rounds of monitoring that it meets the criteria of either paragraph (5)(B)1. or (5)(B)2. of this rule. (6) Additional Monitoring by Systems. The results of any monitoring conducted in addition to the minimum requirements of this rule shall be considered by the system and the department in making any determinations (that is, determining concentrations of water quality parameters) under this rule or 10 CSR 60-15.030. Summary of Monitoring Requirements for Water Quality Parameters1 Monitoring Period Parameters2 Location Frequency Initial monitoring pH, alkalinity, Taps and at entry Every six (6) months orthophosphate point(s) to the or silica3, distribution calcium, conductivity, system temperature After pH, alkalinity, Taps Every six (6) months installation orthophosphate or of corrosion silica3, calcium4 control pH, alkalinity dosage Entry point(s) to No less frequently rate and concentration distribution system6 than every two (2) (if alkalinity adjusted weeks as part of corrosion control), inhibitor dosage rate and inhibitor residual5 After department pH, alkalinity, Taps Every six (6) months specifies parameter orthophosphate or values for optimal silica3, calcium4 corrosion control pH, alkalinity dosage Entry point(s) to the No less frequently rate and concentration distribution system6 than every two (2) (if alkalinity adjusted weeks as part of corrosion control), inhibitor dosage rate and inhibitor residual5 Reduced Monitoring pH, alkalinity, Taps Every six (6) months, orthophosphate annually7 or every three or silica3, calcium4 (3) years8 at a reduced number of sites pH, alkalinity dosage Entry point(s) to the No less rate and concentration distribution system6 frequently than every (if alkalinity adjusted two (2) weeks as part of corrosion control), inhibitor dosage rate and inhibitor residual5 1Table is for illustrative purposes; consult the text of this rule for precise regulatory requirements. 2Small- and medium-size systems have to monitor for water quality parameters only during monitoring periods in which the system exceeds  the lead or copper action level. 3Orthophosphate must be measured only when an inhibitor containing a phosphate compound is used. Silica must be measured only when an inhibitor containing silicate compound is used. 4Calcium must be measured only when calcium carbonate stabilization is used as part of corrosion control. 5Inhibitor dosage rates and inhibitor residual concentrations (orthophosphate or silica) must be measured only when an inhibitor is used. 6Groundwater systems may limit monitoring to representative locations throughout the system. 7Water systems may reduce frequency of monitoring for water quality parameters at the tap from every six (6) months to annually if they have maintained the range of values for water quality parameters reflecting optimal corrosion control during three (3) consecutive years of monitoring. 8Water systems may further reduce the frequency of monitoring for water quality parameters at the tap from annually to once every three (3) years if they have maintained the range of values from water quality parameters reflecting optimal corrosion control during three (3) consecutive years of annual monitoring. Water systems may accelerate to triennial monitoring for quality parameters at the tap if they have maintained ninetieth percentile lead levels less than or equal to 0.005 mg/l, ninetieth percentile copper levels less than or equal to 0.65 mg/l, a n d t h e r a n g e o f w a t e r q u a l i t y p a r a m e t e r s d e s i g n a t e d b y t h e d e p a r t m e n t u n d e r 1 0 C S R 6 0 - 1 5 . 0 3 0 ( 7 ) a s r e p r e s e n t i n g o p t i m a l c o r r o s i o n c o n t r o l d u r i n g t w o ( 2 ) c o n s e c u t i v e s i x - ( 6 - ) m o n t h m o n i t o r i n g p e r i o d s . A U T H O R I T Y : s e c t i o n 6 4 0 . 1 0 0 , R S M o S u p p . 2 0 1 1 . * O r i g i n al rule filed Aug. 4, 1992, effective May 6, 1993. Amended: Filed Feb. 1, 1996, effective Oct. 30, 1996. Amended: Filed Aug. 14, 2001, effective April 30, 2002. Amended: Filed Oct. 17, 2011, effective May 30, 2012. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999, 2002, 2006. 10 CSR 60-15.090 Monitoring Requirements for Lead and Copper in Source Water PURPOSE: This rule establishes monitoring requirements for lead and copper in source waters. (1) Sample Location, Collection Methods, and Number of Samples. (A) A water system that fails to meet the lead or copper action level on the basis of tap samples collected in accordance with 10 CSR 60-15.070 shall collect lead and copper source water samples in accordance with the following requirements regarding sample location, number of samples, and collection methods: 1. Ground water systems shall take a minimum of one (1) sample at every entry point to the distribution system which is representative of each well after treatment (hereafter called a sampling point). The system shall take one (1) sample at the same sampling point unless conditions make another sampling point more representative of each source or treatment plant; 2. Surface water systems shall take a minimum of one (1) sample at every entry point to the distribution system after any application of treatment or in the distribution system at a point which is representative of each source after treatment (hereafter called a sampling point). The system shall take each sample at the same sampling point unless conditions make another sampling point more representative of each source or treatment plant (Note: For the purposes of this requirement, surface water systems include systems with a combination of surface and ground sources); 3. If a system draws water from more than one (1) source and the sources are combined before distribution, the system must sample at an entry point to the distribution system during periods of normal operating conditions (that is, when water is representative of all sources being used); and 4. The department may reduce the total number of samples which must be analyzed by allowing the use of compositing. Compositing of samples must be done by certified laboratory personnel. Composite samples from a maximum of five (5) samples are allowed, provided that if the lead concentration in the composite sample is greater than or equal to 0.001 mg/l or the copper concentration is greater than or equal to 0.160 mg/l, then either: A. A follow-up sample shall be taken and analyzed within fourteen (14) days at each sampling point included in the composite; or B. If duplicates of or sufficient quantities from the original samples from each sampling point used in the composite are available, the system may use these instead of resampling. (B) Where the results of sampling indicate an exceedance of maximum permissible source water levels established under 10 CSR 60-5.040(2)(C), the department may require that one (1) additional sample be collected as soon as possible after the initial sample was taken (but not to exceed two (2) weeks) at the same sampling point. If the department-required confirmation sample is taken for lead or copper, then the results of the initial and confirmation sample shall be averaged in determining compliance with maximum permissible levels. Any sample value below the detection limit shall be considered to be zero (0). Any value above the detection limit but below the practical quantification level (PQL) shall b e a s t h e m e a s u r e d v a l u e o r b e c o n s i d e r e d o n e - h a l f ( 1 / 2 ) P Q L . ( 2 ) M o n i t o r i n g F r e q u e n c y A f t e r S y s t e m E x c e e d s T a p W a t e r A c t i o n L e v e l . A n y s y s t e m w h i c h e x c e e d s t h e l e a d o r c o p p e r a c t i o n l e v e l a t t h e t a p s h a l l c o l l e c t o n e ( 1 ) s o u r c e w a t e r s a m p l e f r o m e a c h e n t ry point to the distribution system no later than six (6) months after the end of the monitoring period during which the lead or copper action level was exceeded. For monitoring periods that are annual or less frequent, the end of the monitoring period is September 30 of the calendar year in which the sampling occurs, or if the department has established an alternate monitoring period, the last day of that period. (3) Monitoring Frequency After Installation of Source Water Treatment. Any system which installs source water treatment pursuant to 10 CSR 60-15.040 shall collect an additional source water sample from each entry point to the distribution system during two (2) consecutive six- (6-) month monitoring periods by the deadline specified in 10 CSR 60-15.040(1)(D). (4) Monitoring Frequency After the Department Specifies Maximum Permissible Source Water Levels or Determines that Source Water Treatment is not Needed. (A) A system shall monitor at the following specified frequency in cases where the department specifies maximum permissible source water levels under 10 CSR 60-15.040(2)(C) or determines that the system is not required to install source water treatment under 10 CSR 60-15.040(2)(A): 1. A water system using only ground water shall collect samples once during the three- (3-) year compliance period in effect when the applicable department determination under subsection (4)(A) of this rule is made. Those systems shall collect samples once during each subsequent compliance period. Triennial samples s ) p × Ø $ % \ ] 8 ö" $ z$ V' ) ) =7 ”= ž> ¢? A@ ÕB ÖB ÎL ÏL [ [ \ ©\ Àw „~ © ôéåÜÑÜÑÜÑÜÑÜÍÇ͹ʹͨš¨š¨Í¹‹¹zkÍg_g hY‚ CJ OJ hY‚ ht+d 6CJ OJ PJ QJ ^J ht+d 6;CJ OJ PJ QJ ^J ht+d 5CJ OJ PJ QJ ^J ht+d 0J PJ QJ RHb ^J ht+d 0J PJ QJ ^J ht+d 6ht+d CJ OJ PJ QJ ^J ht+d @ˆ ht+d hXS ;mH nH u hXS mH nH u hXS hXS 0J 5OJ QJ hXS 0J 5CJ QJ " ) I T p — w ¼ à ) a ´ ž ÷  x k › á ÷ C  6 œ ú õ õ õ õ ó ñ ï ï ï í í í ë ë ë ë ë ï í í ï ï ï ï ï ï $a$ $a$ œ · 8 ­ [ G } 0  ! l! â! z" z$ V' Ì* =+ ý û ù ÷ õ ý ó ñ ñ ñ ñ ñ ñ ñ Ï ´ ™ Æ/ 0ý Ðó p'°£C'A $ Æ/ 0ý Ðó p'°£C'A $ ! $$ Æ, 0ý ô”ˆ(°¤D(B $ „µ `„µ a$ =+ B, ê, œ- ›/ ò0 m2 #4 5 97 °8 õ8 Ð: _<