NR 809.566(3)(a)1.1. Compliance shall be based on a running annual arithmetic average, computed quarterly, of monthly averages of all samples collected by the water supplier for a public water system under s. NR 809.565 (4) (a). If the average of quarterly averages covering any consecutive 4-quarter period exceeds the MRDL, the public water system is in violation of the MRDL and the water supplier shall notify the public pursuant to subch. VII, in addition to reporting to the department pursuant to s. NR 809.567. NR 809.566(3)(a)2.2. In cases where chlorine and chloramines are used for residual disinfection during the year, compliance shall be determined by including together all monitoring results of both chlorine and chloramines in calculating compliance. Reports submitted pursuant to s. NR 809.567 shall clearly indicate which residual disinfectant was analyzed for each sample. NR 809.566(3)(b)1.1. A public water system has an acute violation of the MRDL for chlorine dioxide when any daily sample taken at the entrance to the distribution system exceeds the MRDL and on the following day one or more of the 3 samples taken in the distribution system exceeds the MRDL. If both exceedances occur, the public water system is in violation of the MRDL and the water supplier shall take immediate corrective action to lower the level of chlorine dioxide below the MRDL and shall notify the public pursuant to the procedures for acute health risks in s. NR 809.951. Failure to take samples in the distribution system the day following an exceedance of the chlorine dioxide MRDL at the entrance to the distribution system shall also be considered an MRDL violation and the water supplier shall notify the public of the violation in accordance with the provisions for acute violations under s. NR 809.951. NR 809.566(3)(b)2.2. A public water system has a nonacute violation for chlorine dioxide when any 2 consecutive daily samples taken at the entrance to the distribution system exceed the MRDL and all distribution system samples taken are below the MRDL. A water supplier for a public water system with a nonacute violation shall take corrective action to lower the level of chlorine dioxide below the MRDL at the point of sampling and shall notify the public pursuant to the procedures for nonacute health risks in subch. VII. Failure to monitor at the entrance to the distribution system the day following an exceedance of the chlorine dioxide MRDL at the entrance to the distribution system is also an MRDL violation and the water supplier shall notify the public of the violation in accordance with the provisions for nonacute violations under subch. VII. NR 809.566(4)(4) Compliance requirements for Disinfection byproduct precursors (DBPP). Compliance with disinfection byproduct precursors shall be determined as specified in s. NR 809.569 (1). Water suppliers for public water systems may begin monitoring to determine whether Step 1 TOC removals can be met 12 months prior to the compliance date for the public water system. This monitoring is not required and failure to monitor during this period is not a violation. However, any water supplier that does not monitor during this period, and then determines in the first 12 months after the compliance date that it is not able to meet the Step 1 requirements in s. NR 809.569 (1) (b) and therefore applies for alternate minimum TOC removal (Step 2) requirements, is not eligible for retroactive approval of alternate minimum TOC removal (Step 2) requirements as allowed pursuant to s. NR 809.569 (1) (c) and is in violation. Water supplier may apply for alternate minimum TOC removal (Step 2) requirements any time after the compliance date. For public water systems required to meet Step 1 TOC removals, if the value calculated under s. NR 809.569 (3) (a) or (b) is less than 1.00, the public water system is in violation of the treatment technique requirements and the water supplier shall notify the public pursuant to subch. VII in addition to reporting to the department pursuant to s. NR 809.567. NR 809.566 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10. NR 809.567NR 809.567 Reporting and recordkeeping requirements for disinfection byproducts and disinfection residuals for Stage 1 DBP. NR 809.567(1)(1) Reporting requirements. Water suppliers for public water systems required to be sampled quarterly or more frequently shall report to the department within 10 days after the end of each quarter in which samples were collected, notwithstanding the provisions of s. NR 809.563. Water suppliers for public water systems required to be sampled less frequently than quarterly shall report to the department within 10 days after the end of each monitoring period in which samples were collected. NR 809.567(2)(2) Reporting and recordkeeping requirements for Disinfection byproducts. Water suppliers for public water systems monitored for disinfection byproducts shall report the information specified in the following requirements: NR 809.567(2)(a)(a) Water supplier for public water systems monitored for TTHM and HAA5 under the requirements of s. NR 809.565 (2) on a quarterly or more frequent basis shall report all of the following: NR 809.567(2)(a)2.2. The location, date and result of each sample taken during the last quarter. NR 809.567(2)(a)4.4. The annual arithmetic average of the quarterly arithmetic averages for the last 4 quarters. NR 809.567(2)(b)(b) Water supplier for public water systems monitored for TTHMs and HAA5s under the requirements of s. NR 809.565 (2) less frequently than quarterly but at least annually shall report all of the following: NR 809.567(2)(b)2.2. The location, date and result of each sample taken during the last quarter. NR 809.567(2)(c)(c) Water supplier for public water systems monitored for TTHMs and HAA5s under the requirements of s. NR 809.565 (2) less frequently than annually shall report all of the following: NR 809.567(2)(d)2.2. The location, date and result of each sample taken during the last quarter. NR 809.567(2)(d)3.3. For each month in the reporting period, the arithmetic average of all samples taken in each 3 sample set collected in the distribution system. NR 809.567(2)(e)2.2. The location, date and result of each sample taken during the last quarter. NR 809.567(2)(e)3.3. The arithmetic average of the monthly arithmetic averages of all samples taken in the last year. NR 809.567(3)(3) Reporting and recordkeeping requirements for disinfectants. Water supplier for public water systems monitored for disinfectants shall report the information specified in the following: NR 809.567(3)(a)(a) Water supplier for public water systems monitored for chlorine or chloramines under the requirements of s. NR 809.565 (4) (a) shall report all of the following: NR 809.567(3)(a)2.2. The monthly arithmetic average of all samples taken in each month for the last 12 months. NR 809.567(3)(a)3.3. The arithmetic average of all monthly averages for the last 12 months. NR 809.567(3)(b)(b) Water supplier for public water systems monitored for chlorine dioxide under the requirements of s. NR 809.565 (4) (b) shall report all of the following information: NR 809.567(3)(b)1.1. The dates, results and locations of samples taken during the last quarter. NR 809.567(3)(b)3.3. Whether the MRDL was exceeded in any 2 consecutive daily samples and whether the resulting violation was acute or nonacute as determined according to s. NR 809.566 (3) (b). NR 809.567(4)(4) Disinfection byproduct precursors, enhanced coagulation or enhanced softening treatment systems. Water supplier for public water systems containing disinfection byproduct precursors or using enhanced coagulation or enhanced softening, shall report the information specified in the following: NR 809.567(4)(a)(a) Water supplier for public water systems monitored monthly or quarterly for TOC under the requirements of s. NR 809.565 (5) and required to meet the enhanced coagulation or enhanced softening requirements in s. NR 809.569 (1) (b) or (c) shall report all of the following: NR 809.567(4)(a)1.1. The number of paired samples of source water and treated water, both prior to continuous disinfection, taken during the last quarter. NR 809.567(4)(a)2.2. The location, date and result of each paired sample and associated alkalinity taken during the last quarter. NR 809.567(4)(a)3.3. For each month in the reporting period that paired samples were taken, the arithmetic average of the percent reduction of TOC for each paired sample and the required TOC percent removal. NR 809.567(4)(a)5.5. Whether the public water system is in compliance with the enhanced coagulation or enhanced softening percent removal requirements in s. NR 809.569 (1) for the last 4 quarters. NR 809.567(4)(b)(b) Water supplier for public water systems monitored monthly or quarterly for TOC under the requirements of s. NR 809.565 (5) and meeting one or more of the alternative compliance criteria in s. NR 809.569 (2) (b) or (c) shall report all of the following: NR 809.567(4)(b)1.1. The alternative compliance criterion that the water supplier for the public water system is using. NR 809.567(4)(b)3.3. The location, date and result of each paired sample and associated alkalinity taken during the last quarter. NR 809.567(4)(b)5.5. The running annual arithmetic average based on monthly averages or quarterly samples of source water SUVA for public water systems meeting the criterion in s. NR 809.569 (2) (b) 6. or of treated water SUVA for public water systems meeting the criterion in s. NR 809.569 (2) (b) 7. NR 809.567 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10. NR 809.569NR 809.569 Treatment technique for control of disinfection byproduct (DBP) precursors. For public water systems using conventional treatment which are supplied by a surface water source or by a groundwater source under the direct influence of surface water, the department identifies enhanced coagulation or enhanced softening as treatment techniques to control the level of disinfection byproduct precursors in drinking water and distribution systems. Treatment technique requirements for DBP precursors shall comply with the following: NR 809.569(1)(1) Enhanced coagulation and enhanced softening performance requirements. NR 809.569(1)(a)(a) Public water systems using enhanced coagulation or enhanced softening shall achieve the percent reduction of TOC specified in par. (b) between the source water and the combined filter effluent, unless the department approves the water supplier’s request for alternate minimum TOC removal (Step 2) requirements under par. (c). NR 809.569(1)(b)(b) Required Step 1 TOC reductions, indicated in Table V, are based upon specified source water parameters measured in accordance with s. NR 809.563 (6). Public water systems practicing softening are required to meet the Step 1 TOC reductions in the far-right column, source water alkalinity >120 mg/L, for the specified source water TOC: Table V
Step 1 Required Removal of TOC by Enhanced Coagulation and Enhanced Softening for Surface Water Systems Using Conventional Treatment
NR 809.569(1)(b)1.1. Public water systems meeting at least one of the conditions in sub. (2) (b) 1. to 7. are not required to operate with enhanced coagulation. NR 809.569(1)(b)2.2. Softening treatment systems meeting one of the alternative compliance criteria in sub. (2) (c) are not required to operate with enhanced softening. NR 809.569(1)(b)3.3. Public water systems practicing softening shall meet the TOC removal requirements in the column marked >120 for source water alkalinity in mg/L as CaCO3. NR 809.569(1)(c)(c) Water supplier for public water systems using conventional treatment which are supplied by a surface water source or by a groundwater source under the direct influence of surface water which cannot achieve the Step 1 TOC removals required by par. (b) due to water quality parameters or operational constraints shall apply to the department, within 3 months of failure to achieve the TOC removals required by par. (b), for approval of alternative minimum TOC (Step 2) removal requirements submitted by the water supplier. If the department approves the alternative minimum TOC removal (Step 2) requirements, the department may make those requirements retroactive for the purposes of determining compliance. Until the department approves the alternative minimum TOC removal (Step 2) requirements, the public water system shall meet the Step 1 TOC removals contained in par. (b). NR 809.569(1)(d)(d) Applications made to the department by the water supplier for enhanced coagulation treatment systems for approval of alternative minimum TOC removal (Step 2) requirements under par. (c) shall include, as a minimum, results of bench- or pilot-scale testing conducted under subd. 1. and used to determine the alternate enhanced coagulation level. NR 809.569(1)(d)1.1. Alternate enhanced coagulation level shall be determined to be coagulation at a coagulant dose and pH as determined by the method described in this subdivision and subds. 2. to 5. such that an incremental addition of 10 mg/L of alum, or equivalent amount of ferric salt, results in a TOC removal of < 0.3 mg/ L. The percent removal of TOC at this point on the “TOC removal versus coagulant dose’’ curve shall be determined to be the minimum TOC removal required for the public water system. Once approved by the department, this minimum requirement supersedes the minimum TOC removal required by the table in par. (b). This requirement will be effective until the department approves a new value based on the results of a new bench- and pilot-scale test. Failure to achieve department-set alternative minimum TOC removal levels is a violation of this chapter and the federal national primary drinking water regulations. NR 809.569(1)(d)2.2. Bench- or pilot-scale testing of enhanced coagulation shall be conducted by using representative water samples and adding 10 mg/L increments of alum, or equivalent amounts of ferric salt, until the pH is reduced to a level less than or equal to the enhanced coagulation Step 2 target pH shown in Table W: Table W
Enhanced Coagulation Step 2 Target pH
Alkalinity (mg/L as CaCO3) Target pH
0-60 5.5
>60-120 6.3
>120-240 7.0
>240 7.5
NR 809.569(1)(d)3.3. For waters with alkalinity of less than 60 mg/L for which addition of small amounts of alum or equivalent addition of iron coagulant drives the pH below 5.5 before significant TOC removal occurs, the public water system shall add necessary chemicals to maintain the pH between 5.3 and 5.7 in samples until the TOC removal of 0.3 mg/L per 10 mg/L alum added, or equivalent addition of iron coagulant, is reached. NR 809.569(1)(d)4.4. The public water system may be operated at any coagulant dose or pH necessary, consistent with other national public drinking water rules or NPDWRs, to achieve the minimum TOC percent removal approved under par. (c). NR 809.569(1)(d)5.5. If the TOC removal is consistently less than 0.3 mg/L of TOC per 10 mg/L of incremental alum dose at all dosages of alum, or equivalent addition of iron coagulant, the water is deemed to contain TOC not amenable to enhanced coagulation. The water supplier may then apply to the department for a waiver of enhanced coagulation requirements. NR 809.569(2)(a)(a) Public water systems using conventional filtration treatment which are supplied by a surface water source or by a groundwater source under the direct influence of surface water shall operate with enhanced coagulation or enhanced softening to achieve the TOC percent removal levels specified in sub. (1) unless the public water system meets at least one of the alternative compliance criteria listed in par. (b) or (c).
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