NR 809.541(3)
(3) Laboratory certification. Analyses for alkalinity, calcium, conductivity, orthophosphate, pH, silica, and temperature may be performed by any person acceptable to the department. Analyses under this section for lead and copper shall only be conducted by laboratories that have been certified by EPA or the department. To obtain certification to conduct analyses for lead and copper, laboratories shall meet all of the requirements in sub.
(4) (a) to
(c).
NR 809.541(4)
(4) Laboratory evaluation samples. For certification under sub.
(3) laboratories shall analyze performance evaluation samples, which include lead and copper, provided by or acceptable to EPA or the department at least once a year by each method for which the laboratory desires certification; and the following:
NR 809.541(4)(a)1.
1. For lead:
±30 percent of the actual amount in the Performance Evaluation sample when the actual amount is greater than or equal to 0.005 mg/L. The Practical Quantitation Level, or PQL for lead is 0.005 mg/L.
NR 809.541(4)(a)2.
2. For copper:
±10 percent of the actual amount in the Performance Evaluation sample when the actual amount is greater than or equal to 0.050 mg/L. The Practical Quantitation Level, or PQL for copper is 0.050 mg/L.
NR 809.541(4)(b)
(b) Achieve the method detection limit for lead of 0.001 mg/L according to the procedures in appendix B of
40 CFR part 136. This need only be accomplished if the laboratory will be processing source water composite samples under s.
NR 809.549 (1) (a) 4. NR 809.541(4)(c)
(c) Be currently certified by EPA or the department under ch.
NR 149 to perform analyses to the specifications described in pars.
(a) and
(b).
NR 809.541(5)
(5) Data reporting requirements. Laboratories shall report data as follows:
NR 809.541(5)(a)
(a) All lead and copper levels measured between the PQL and MDL shall be either reported as measured or they can be reported as one-half the PQL specified for lead and copper in par.
(a). All levels below the lead and copper MDLs shall be reported as zero.
NR 809.541(5)(b)
(b) All copper levels measured between the PQL and the MDL shall be either reported as measured or they can be reported as one-half the PQL at 0.025 mg/L. All levels below the copper MDL shall be reported as zero.
NR 809.541(6)
(6) Treatment Reporting requirements. Water suppliers shall report to the department any information required by the treatment provisions of this subchapter and s.
NR 809.55.
NR 809.541(7)
(7) Recordkeeping requirements. Water suppliers shall maintain records in accordance with s.
NR 809.82.
NR 809.541(8)
(8) Violation of national primary drinking water regulations. Failure to comply with the applicable requirements of ss.
NR 809.113,
809.541 to
809.549,
809.80, and
809.82, including requirements established by the department pursuant to these provisions, shall constitute a violation of the primary drinking water regulations for lead or copper, or both.
NR 809.541(9)
(9) Premise owner notification of lead and copper results. Water suppliers shall provide owners or occupants of all premises used in the lead and copper monitoring program the analytical results of all samples collected at that site. If sample results at a sample location exceed 15
ug/L for lead and 1300
ug/L for copper, water supplier shall inform premise owners or occupants of health effects and measures necessary to lower lead or copper levels.
NR 809.541 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10; correction in (4) (b) made under s.
13.92 (4) (b) 7., Stats.,
Register January 2013 No. 685;
CR 15-049: am. (4) (c)
Register March 2016 No. 723, eff. 4-1-16.
NR 809.542
NR 809.542 Applicability of corrosion control treatment steps for small, medium and large-size water systems. NR 809.542(1)(1)
Corrosion control treatment requirements. Water suppliers shall complete the applicable corrosion control treatment requirements described in s.
NR 809.543 by the deadlines established.
NR 809.542(1)(a)
(a) The water supplier for a large system shall complete the corrosion control treatment steps specified in sub.
(4), unless the public water system is deemed to have optimized corrosion control under sub.
(2) (b) or
(c).
NR 809.542(1)(b)
(b) The water supplier for a small system and a medium-size system shall complete the corrosion control treatment steps specified in sub.
(5), unless the public water system is deemed to have optimized corrosion control under sub.
(2) (a),
(b) or
(c).
NR 809.542(2)
(2) Determination of optimum corrosion control. A public 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 public water system satisfies one of the criteria specified in pars.
(a) to
(c). Any public water system deemed to have optimized corrosion control under this subsection, 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.
NR 809.542(2)(a)
(a) A small or medium-size water system is deemed to have optimized corrosion control if the public water system meets the lead and copper action levels during each of 2 consecutive 6-month monitoring periods conducted in accordance with s.
NR 809.547.
NR 809.542(2)(b)
(b) Any public water system may be deemed by the department to have optimized corrosion control treatment if the water supplier demonstrates to the satisfaction of the department that they have conducted activities equivalent to the corrosion control steps applicable to the public water systems under this section. If the department makes this determination, it shall provide the water supplier with written notice explaining the basis for its decision and shall specify the water quality control parameters representing optimal corrosion control in accordance with s.
NR 809.543 (6). Public 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 s.
NR 809.543 (8) and continue to conduct lead and copper tap and water quality parameter sampling in accordance with ss.
NR 809.547 (4) (c) and
809.548 (4), respectively. A water supplier shall provide the department with all of the following information in order to support a determination under this subsection:
NR 809.542(2)(b)2.
2. A report explaining the test methods used by the water supplier to evaluate the corrosion control treatments listed in s.
NR 809.543 (3) (a), the results of all tests conducted, and the basis for the water supplier's selection of optimal corrosion control treatment.
NR 809.542(2)(b)3.
3. 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.
NR 809.542(2)(b)4.
4. The results of tap water samples collected in accordance with s.
NR 809.547 at least once every 6 months for one year after corrosion control has been installed.
NR 809.542(2)(c)
(c) Any public water system is deemed to have optimized corrosion control if the water supplier submits results of tap water monitoring conducted in accordance with s.
NR 809.547 and source water monitoring conducted in accordance with s.
NR 809.549 that demonstrates for 2 consecutive 6-month monitoring periods that the difference between the 90
th percentile tap water lead level computed under s.
NR 809.54 (3) (c), and the highest source water lead concentration, is less than the practical quantitation level for lead specified in
40 CFR 141.89(a)(1)(ii).
NR 809.542(2)(c)1.
1. The department may deem that public water systems whose highest source water lead level is below method detection limit have optimized corrosion control under this subsection if the 90
th percentile tap water lead level is less than or equal to the practical quantitation level for 2 consecutive 6-month monitoring periods.
NR 809.542(2)(c)2.
2. Any public water system deemed to have optimized corrosion control in accordance with this subsection shall continue monitoring for lead and copper at the tap no less frequently than once every 3 calendar years using the reduced number of sites specified in s.
NR 809.547 (3) and collecting the samples at times and locations specified in s.
NR 809.547 (4) (d) 4. Any water supplier for a public water system that has not conducted a round of monitoring pursuant to s.
NR 809.547 (4) (d) since September 30, 1997, shall complete a round of monitoring pursuant to this subsection as specified by the department.
NR 809.542(2)(c)3.
3. Any water suppliers for a public water system deemed to have optimized corrosion control pursuant to this paragraph shall notify the department in writing pursuant to s.
NR 809.55 (1) (c) 3. of any upcoming long-term change in treatment or addition of a new source as described in that section. The department shall review and approve the addition of a new source or long-term change in water treatment before it is implemented by the water supplier. The department may require any water supplier to conduct additional monitoring or to take other action the department deems appropriate to ensure that the water supplier maintains minimal levels of corrosion in the distribution system.
NR 809.542(2)(c)4.
4. As of December 1, 2002, a public water system is not deemed to have optimized corrosion control under this subsection, and the water supplier shall implement corrosion control treatment pursuant to subd.
5. unless the public water system meets the copper action level.
NR 809.542(2)(c)5.
5. Any public water system triggered into corrosion control because it is no longer deemed to have optimized corrosion control under this subsection shall implement corrosion control treatment in accordance with the deadlines in sub.
(5). Any large system shall adhere to the schedule specified in that paragraph for medium-size systems, with the time periods for completing each step being triggered by the date the public water system is no longer deemed to have optimized corrosion control under this subsection.
NR 809.542(3)
(3) Criteria for completing corrosion control treatment studies for small and medium-size systems. Any water supplier for a small or medium-size water system that is required to complete the corrosion control steps due to the exceedance of the lead or copper action level may cease completing the treatment steps whenever the public water system meets both action levels during each of 2 consecutive monitoring periods conducted pursuant to s.
NR 809.547 and the results are submitted to the department. If any such public water system thereafter exceeds the lead or copper action level during any monitoring period, the water supplier 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 water supplier to repeat treatment steps previously completed by the water supplier if the department determines that this is necessary to properly implement the treatment requirements. The department shall notify the water supplier in writing of such a determination and explain the basis for its decision. The water supplier for a small or medium-size water system shall implement corrosion control treatment steps in accordance with sub.
(5), including a public water system deemed to have optimized corrosion control under sub.
(2) (a), whenever it exceeds the lead or copper action level.
NR 809.542(4)
(4) Treatment steps and deadlines for large systems. Except as provided in sub.
(2) (b) and
(c), water suppliers for large systems shall complete the following corrosion control treatment steps by the indicated dates:
NR 809.542(4)(a)
(a) Step 1: The water supplier shall conduct initial monitoring during 2 consecutive 6-month monitoring periods by January 1, 1993.
NR 809.542(4)(b)
(b) Step 2: The water supplier shall complete corrosion control studies and submit option for optimal corrosion control treatment to the department by July 1, 1994.
NR 809.542(4)(c)
(c) Step 3: The department shall approve optimal corrosion control treatment by January 1, 1995.
NR 809.542(4)(d)
(d) Step 4: The water supplier shall install optimal corrosion control treatment by January 1, 1997.
NR 809.542(4)(e)
(e) Step 5: The water supplier shall complete follow-up sampling by January 1, 1998.
NR 809.542(4)(f)
(f) Step 6: The department shall review installation of treatment and approve optimal water quality control parameters by July 1, 1998.
NR 809.542(4)(g)
(g) Step 7: The water supplier shall operate in compliance with the department-approved optimal water quality control parameters and continue to conduct tap sampling.
NR 809.542(5)
(5) Treatment steps and deadlines for small and medium-size systems. Except as provided in sub.
(2), water suppliers for small and medium-size systems shall complete the following corrosion control treatment steps by the indicated time periods:
NR 809.542(5)(a)
(a) Step 1: The water supplier shall conduct initial tap sampling until the public water system either exceeds the lead or copper action level or becomes eligible for reduced monitoring under s.
NR 809.547 (4) (d). A water supplier exceeding the lead or copper action level shall recommend optimal corrosion control treatment, under s.
NR 809.543 (1), within six months after the end of the monitoring period during which the public water system exceeds one of the action levels.
NR 809.542(5)(b)
(b) Step 2: Within 12 months after the end of the monitoring period during which a public water system exceeds the lead or copper action level, the department may require the water supplier to perform corrosion control studies, under s.
NR 809.543 (2). If the department does not require the water supplier to perform such studies, the department shall specify optimal corrosion control treatment, under s.
NR 809.543 (4) within the following timeframes:
NR 809.542(5)(b)1.
1. For medium-size systems, within 18 months after the end of the monitoring period during which such public water system exceeds the lead or copper action level.
NR 809.542(5)(b)2.
2. For small systems, within 24 months after the end of the monitoring period during which such public water system exceeds the lead or copper action level.
NR 809.542(5)(c)
(c) Step 3: If the department requires a water supplier to perform corrosion control studies under step 2, the water supplier shall complete the studies within 18 months after the department requires the studies be conducted.
NR 809.542(5)(d)
(d) Step 4: If the water supplier has performed corrosion control studies under step 2, the department shall review and determine adequacy of public water system's optimal corrosion control treatment within 6 months after completion of step 3.
NR 809.542(5)(e)
(e) Step 5: The water supplier shall install optimal corrosion control treatment within 24 months after the department approves the treatment.
NR 809.542(5)(f)
(f) Step 6: The water supplier shall complete follow-up sampling within 36 months after the department approves optimal corrosion control treatment.
NR 809.542(5)(g)
(g) Step 7: The department shall review the installation of treatment and approve optimal water quality control parameters within 6 months after completion of step 6.
NR 809.542(5)(h)
(h) Step 8: The water supplier shall operate in compliance with the department-approved optimal water quality control parameters and continue to conduct tap sampling.
NR 809.542 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10; correction in (2) (c) made under s.
13.92 (4) (b) 7., Stats.,
Register November 2010 No. 659;
CR 15-049: am. (2) (c) 3.
Register March 2016 No. 723, eff. 4-1-16; correction in (5) (b) made under s.
13.92 (4) (b) 7., Stats.,
Register July 2022 No. 799.
NR 809.543
NR 809.543 Description of corrosion control treatment requirements. Each water supplier shall complete the following corrosion control treatment requirements which are applicable to their public water system under s.
NR 809.542.
NR 809.543(1)
(1) Water supplier recommendation regarding corrosion control treatment. Based upon the results of lead and copper tap monitoring and water quality parameter monitoring, water supplier for a small and medium-size water systems exceeding the lead or copper action level shall recommend installation of one or more of the corrosion control treatments listed in sub.
(3) (a) which the water supplier believes constitutes optimal corrosion control for that public water system. The department may require the water supplier to conduct additional water quality parameter monitoring in accordance with s.
NR 809.548 (2) to assist the department in reviewing the water supplier's recommendation. In no case may the time period for installation of optimal corrosion control treatment on a small or medium-size system exceed the schedule as listed in s.
NR 809.542 (5) (a) to
(h).
NR 809.543(2)
(2) Department decision to require studies of corrosion control treatment by small and medium-size systems. The department may require the water supplier of any small or medium-size system that exceeds the lead or copper action level to perform corrosion control studies under sub.
(3) to identify optimal corrosion control treatment for the public water system.
NR 809.543(3)(a)(a) Any water supplier 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 public water system:
NR 809.543(3)(a)3.
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.
NR 809.543(3)(b)
(b) The water supplier shall evaluate each of the corrosion control treatments listed in par.
(a) using either pipe rig or loop tests, metal coupon tests, partial-system tests, or analyses based on documented analogous treatments with other public water systems of similar size, water chemistry and distribution system configuration.
NR 809.543(3)(c)
(c) The water supplier shall measure all of the following water quality parameters in any tests conducted before and after evaluating the corrosion control treatments listed in par.
(a):
NR 809.543(3)(c)7.
7. Orthophosphate (when an inhibitor containing a phosphate compound is used).
NR 809.543(3)(d)
(d) The water supplier shall identify all chemical or physical constraints that limit or prohibit the use of a particular corrosion control treatment and document such constraints with at least one of the following:
NR 809.543(3)(d)1.
1. Data and documentation showing that a particular corrosion control treatment has adversely affected other water treatment processes when used by another public water system with comparable water quality characteristics.
NR 809.543(3)(d)2.
2. Data and documentation demonstrating that the water supplier 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, or both.
NR 809.543(3)(e)
(e) The water supplier shall evaluate the effect of the chemicals used for corrosion control treatment on other water quality treatment processes.
NR 809.543(3)(f)
(f) On the basis of an analysis of the data generated during each evaluation, the water supplier shall recommend to the department in writing the treatment option that the corrosion control studies indicate constitutes optimal corrosion control treatment for that public water system. The water supplier shall provide a rationale for its recommendation along with all supporting documentation specified in pars.
(a) to
(e).
NR 809.543(4)
(4) Department evaluation of optimal corrosion control treatment. NR 809.543(4)(a)(a) Based upon consideration of available information including, where applicable, studies performed under sub.
(3) and a water supplier's recommended treatment alternative, the department shall either approve the corrosion control treatment option recommended by the water supplier, or designate alternative corrosion control treatments from among those listed in sub.
(3) (a). When approving optimal treatment, the department shall consider the effects that additional corrosion control treatment will have on water quality parameters and on other water quality treatment processes.
NR 809.543(4)(b)
(b) The department shall notify the water supplier of its decision on optimal corrosion control treatment in writing and explain the basis for this determination. If the department requests additional information to aid its review, the water supplier shall provide the information.
NR 809.543(5)
(5) Installation of optimal corrosion control. Each water supplier shall properly install and operate throughout the public water system's distribution system the optimal corrosion control treatment approved by the department under sub.
(4).
NR 809.543(6)
(6) Department review of treatment. The department shall evaluate the results of all lead and copper tap samples and water quality parameter samples submitted by the water supplier and determine whether the water supplier has properly installed and operated the optimal corrosion control treatment approved by the department in sub.
(4). Upon reviewing the results of tap water and water quality parameter monitoring by the water supplier, both before and after the water supplier installs optimal corrosion control treatment, the department shall establish ranges for water quality parameters.
NR 809.543(7)
(7) Approval of optimal water quality control parameters. The department shall review the water supplier's recommendations and select the values for the applicable water quality control parameters listed in sub.
(3) which reflect optimal corrosion control treatment for the public water system. The department may specify values for additional water quality control parameters to reflect optimal corrosion control for the public water system. The department shall notify the water supplier in writing of these determinations and explain the basis for its decision. At a minimum, the department shall establish all of the following:
NR 809.543(7)(a)
(a) A minimum value or a range of values for pH measured at each entry point to the distribution system.
NR 809.543(7)(b)
(b) A minimum pH value, measured in all tap samples. The value shall be equal to or greater than 7.0, unless the water supplier provides information to indicate that meeting a pH level of 7.0 is not technologically feasible or is not necessary for the public water system to optimize corrosion control.
NR 809.543(7)(c)
(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 protect the interior walls of the pipes of the distribution system from corrosion.
NR 809.543(7)(d)
(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.
NR 809.543(7)(e)
(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.
NR 809.543(8)
(8) Continued operation and monitoring. All water suppliers 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 sub.
(7), in accordance with this subsection for all samples collected under s.
NR 809.548 (4). Compliance with the requirements of this subsection shall be determined every 6 months, as specified under s.
NR 809.548 (4). A public water system is out of compliance with the requirements of this subsection for a 6-month period if it has excursions for any department-specified parameter on more than 9 days during the period. An excursion occurs whenever the daily value for one 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. The department may delete results of obvious sampling errors from this calculation. Daily values are calculated as follows:
