NR 809.569(2)(b)5.5. The TTHM and HAA5 running annual averages are no greater than 0.040 mg/L and 0.030 mg/L, respectively, and the public water system uses only chlorine for primary disinfection and maintenance of a residual in the distribution system. NR 809.569(2)(b)6.6. The public water system’s source water SUVA, prior to any treatment and measured monthly according to s. NR 809.563 (6) (d), is less than or equal to 2.0 L/mg-m, calculated quarterly as a running annual average. NR 809.569(2)(b)7.7. The public water system’s finished water SUVA, measured monthly according to s. NR 809.563 (6) (d), is less than or equal to 2.0 L/mg-m, calculated quarterly as a running annual average. NR 809.569(2)(c)(c) Public water systems practicing enhanced softening that cannot achieve the TOC removals required by sub. (1) (b) may use the alternative compliance criteria in subds. 1. and 2. in lieu of complying with sub. (1) (b). Public water systems shall still comply with monitoring requirements in s. NR 809.565 (5). NR 809.569(2)(c)1.1. Softening that results in lowering the treated water alkalinity to less than 60 mg/L (as CaCO3), measured monthly according to s. NR 809.563 (6) (a) and calculated quarterly as a running annual average. NR 809.569(2)(c)2.2. Softening that results in removing at least 10 mg/L of magnesium hardness (as CaCO3), measured monthly according to s. NR 809.113 Table A and calculated quarterly as an annual running average. NR 809.569(3)(a)(a) Public water systems which are supplied by a surface water source or by a groundwater source under the direct influence of surface water, other than those identified in sub. (2) (b) or (c) shall comply with requirements contained in sub. (1) (b) or (c). Water suppliers shall calculate compliance quarterly, beginning after the water supplier for the public water system has collected 12 months of data, by determining an annual average using the following method: NR 809.569(3)(a)1.1. Determine actual monthly TOC percent removal, by using the following equation: (1-(treated water TOC/source water TOC)) x 100 = percent TOC removal. NR 809.569(3)(a)5.5. If the value calculated in subd. 4. is less than 1.00, the public water system is not in compliance with the TOC percent removal requirements. NR 809.569(3)(b)(b) Water supplier may use the provisions in subds. 1. to 5. in lieu of the calculations in par. (a) 1. to 5. to determine compliance with TOC percent removal requirements. NR 809.569(3)(b)1.1. In any month that the public water system’s treated or source water TOC level, measured according to s. NR 809.563 (6) (c), is less than 2.0 mg/L, the water supplier may assign a monthly value of 1.0, in lieu of the value calculated in par. (a) 3. when calculating compliance under the provisions of par. (a). NR 809.569(3)(b)2.2. In any month that a public water system practicing softening removes at least 10 mg/L of magnesium hardness as CaCO3, the water supplier may assign a monthly value of 1.0 in lieu of the value calculated in par. (a) 3. when calculating compliance under the provisions of par. (a). NR 809.569(3)(b)3.3. In any month that the public water system’s source water SUVA, prior to any treatment and measured according to s. NR 809.563 (6) (d), is < 2.0 L/mg-M, the water supplier may assign a monthly value of 1.0, in lieu of the value calculated in par. (a) 3. when calculating compliance under the provisions of par. (a). NR 809.569(3)(b)4.4. In any month that the public water system’s finished water SUVA, measured according to s. NR 809.563 (6) (d), is < 2.0 L/mg-M, the water supplier may assign a monthly value of 1.0 in lieu of the value calculated in par. (a) 3. when calculating compliance under the provisions of par. (a). NR 809.569(3)(b)5.5. In any month that a public water system practicing enhanced softening lowers alkalinity below 60 mg/L as CaCO3, the water supplier may assign a monthly value of 1.0, in lieu of the value calculated in par. (a) 3. when calculating compliance under the provisions of par. (a). NR 809.569(3)(c)(c) Public water systems which are supplied by a surface water source or by a groundwater source under the direct influence of surface water and which are using conventional filtration treatment may also comply with the requirements by meeting the criteria in sub. (2) (b) or (c). NR 809.569 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 15-049: am. (1) (b) Table V, 3., (2) (c) 2. Register March 2016 No. 723, eff. 4-1-16. NR 809.60NR 809.60 General requirements for Stage 2 DBP disinfection byproducts control. NR 809.60(1)(1) General. The following establish monitoring and other requirements for achieving compliance with maximum contaminant levels based on locational running annual averages (LRAA) for total trihalomethanes (TTHM) and haloacetic acids five (HAA5), and for achieving compliance with maximum residual disinfectant levels for chlorine and chloramine for certain consecutive systems. NR 809.60(2)(2) Applicability. A public water system is subject to these requirements if the public water system is a community water system or a nontransient noncommunity water system that uses a primary or residual disinfectant other than ultraviolet light or delivers or receives water that has been treated with a primary or residual disinfectant other than ultraviolet light. NR 809.60(3)(3) Schedule. Public water systems shall comply with the requirements on the schedule in Table X based on public water system population: 1 The department may grant up to an additional 24 months for compliance with MCLs and operational evaluation levels if the public water system requires capital improvements to comply with an MCL.
NR 809.60(4)(a)(a) Water suppliers for public water systems required to be monitored quarterly shall begin monitoring in the first full calendar quarter that includes the compliance date in the table in sub. (3).
