NR 809.80(6)(b)8.g.g. If the department determines, based on site specific considerations, that a water supplier has no means for having a sample transported and analyzed for HPC by a certified laboratory within the requisite time and temperature conditions specified by s. NR 810.38 and that the public water system is providing adequate disinfection in the distribution system, the requirements of this subd. 8. a. to f. do not apply.

NR 809.80(6)(b)9.9. A water supplier need not report the data listed in subds. 1. and 3. to 6. if all data listed in par. (b) remain on file at the public water system and department determines that:

NR 809.80(6)(b)9.a.a. The water supplier has submitted to the department all the information required by subds. 1. to 8. for at least 12 months; and

NR 809.80(6)(b)9.b.b. The department has determined that the public water system is not required to provide filtration treatment.

NR 809.80(6)(c)(c) No later than 10 days after September 30, the end of each federal fiscal year, each water supplier shall provide to the department a report which summarizes the public water system’s compliance with all wellhead protection program requirements specified in s. NR 810.30 (2) (b).

NR 809.80(6)(d)(d) No later than 10 days after September 30, the end of each federal fiscal year, each water supplier shall provide to the department a report of the on-site inspection conducted during that year pursuant to s. NR 810.32 (2) (c), unless the on-site inspection was conducted by the department. If the inspection was conducted by the department, the department shall provide a copy of its report to the public water system.

NR 809.80(6)(e)1.1. Each water supplier, upon discovering that a waterborne disease outbreak potentially attributable to their public water system has occurred, shall report that occurrence to the department as soon as possible, but no later than by the end of the next business day.

NR 809.80(6)(e)2.2. If at any time the turbidity exceeds 5 NTU, the water supplier shall consult with the department as soon as possible, but no later than 24 hours after the exceedance is known, in accordance with the public notification requirements under s. NR 809.952 (2) (c).

NR 809.80(6)(e)3.3. If at any time the disinfectant residual falls below 0.2 mg/l in the water entering the distribution system, the water supplier shall notify the department as soon as possible, but no later than by the end of the next business day. The water supplier also shall notify the department by the end of the next business day whether or not the residual was restored to at least 0.2 mg/l within 4 hours.

NR 809.80(7)(7) Monthly operating reports — with filtration. A water supplier for a public water system that uses a surface water source or a groundwater source under the direct influence of surface water and provides filtration treatment shall report monthly to the department the information specified in this subsection.

NR 809.80(7)(a)(a) Turbidity measurements as required by s. NR 810.38 (2) (a) shall be reported within 10 days after the end of each month the public water system serves water to the public. Information that shall be reported includes:

NR 809.80(7)(a)1.1. The total number of filtered water turbidity measurements taken during the month and the highest daily turbidity measurement for each day.

NR 809.80(7)(a)2.2. The number and percentage of filtered water turbidity measurements taken during the month which are less than or equal to the turbidity limits specified in s. NR 810.29 for the filtration technology being used.

NR 809.80(7)(a)3.3. The date and value of any turbidity measurements taken during the month which exceed 1.0 NTU for public water systems using conventional or direct filtration, or which exceed the maximum level set in s. NR 810.29.

NR 809.80(7)(b)(b) Disinfection information specified in s. NR 810.38 shall be reported to the department within 10 days after the end of each month the public water system serves water to the public. Information that shall be reported includes:

NR 809.80(7)(b)1.1. For each day, the lowest measurement of residual disinfectant concentration in mg/l in water entering the distribution system.

NR 809.80(7)(b)2.2. The date and duration of each period when the residual disinfectant concentration in water entering the distribution system fell below 0.2 mg/l and when the department was notified of the occurrence.

NR 809.80(7)(b)3.3. The following information on the samples taken in the distribution system in conjunction with total coliform monitoring pursuant to s. NR 810.31:

NR 809.80(7)(b)3.a.a. Number of instances where the residual disinfectant concentration is measured;

NR 809.80(7)(b)3.b.b. Number of instances where the residual disinfectant concentration is not measured but heterotrophic bacteria plate count (HPC) is measured;

NR 809.80(7)(b)3.c.c. Number of instances where the residual disinfectant concentration is measured but not detected and no HPC is measured;

NR 809.80(7)(b)3.d.d. Number of instances where no residual disinfectant concentration is detected and where HPC is > 500/ml;