NR 809.80(7)(b)3.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. 3. a. to f. do not apply.

NR 809.80(7)(b)4.4. A water supplier need not report the data listed in subd. 1. if all data listed in this paragraph remains on file at the public water system and the department determines that the water supplier has submitted all the information required by this paragraph for at least 12 months.

NR 809.80(7)(c)1.1. If during any 4 hour monitoring period the turbidity exceeds 0.3 NTU or at any time during the month, turbidity measurements indicate the 95th percentile turbidity level of 0.5 NTU will be exceeded for that month, the water supplier shall inform the department as soon as possible, but no later than the end of the next business day.

NR 809.80(7)(c)2.2. 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 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(8)(8) Records retention and reporting. Public water systems shall maintain the results of individual filter monitoring taken under s. NR 810.38 (2) for at least 3 years. Water suppliers shall report that they have conducted individual filter turbidity monitoring under s. NR 810.38 (2) (b) within 10 days after the end of each month the public water system serves water to the public. Water suppliers shall report individual filter turbidity measurement results taken under s. NR 810.38 (2) within 10 days after the end of each month the public water system serves water to the public only if measurements demonstrate one or more of the conditions in pars. (a) to (d). Water suppliers for public water systems that use lime softening may apply to the department for alternative exceedance levels for the levels specified in pars. (a) to (d) if they can demonstrate that higher turbidity levels in individual filters are due to lime carryover only and not due to degraded filter performance.

NR 809.80(8)(a)(a) For any individual filter that has a measured turbidity level of greater than 1.0 NTU in 2 consecutive measurements taken 15 minutes apart, the water supplier shall report the filter number, the turbidity measurement, and the dates on which the exceedance occurred. In addition, the water supplier shall either produce a filter profile for the filter within 7 days of the exceedance, if the water supplier is not able to identify an obvious reason for the abnormal filter performance, and report that the profile has been produced or report the obvious reason for the exceedance.

NR 809.80(8)(b)(b) For any individual filter that has a measured turbidity level of greater than 0.5 NTU in 2 consecutive measurements taken 15 minutes apart at the end of the first 4 hours of continuous filter operation after the filter has been backwashed or otherwise taken offline, the water supplier shall report the filter number, the turbidity, and the dates on which the exceedance occurred. In addition, the water supplier shall either produce a filter profile for the filter within 7 days of the exceedance, if the water supplier not able to identify an obvious reason for the abnormal filter performance, and report that the profile has been produced or report the obvious reason for the exceedance.

NR 809.80(8)(c)(c) For any individual filter that has a measured turbidity level of greater than 1.0 NTU in 2 consecutive measurements taken 15 minutes apart at any time in each of 3 consecutive months, the water supplier shall report the filter number, the turbidity measurement, and the dates on which the exceedance occurred. In addition, the water supplier shall conduct a self-assessment of the filter within 14 days of the exceedance and report that the self-assessment was conducted. The self-assessment shall consist of at least the following components: assessment of filter performance; development of a filter profile; identification and prioritization of factors limiting filter performance; assessment of the applicability of corrections; and preparation of a filter self-assessment report.

NR 809.80(8)(d)(d) For any individual filter that has a measured turbidity level of greater than 2.0 NTU in 2 consecutive measurements taken 15 minutes apart at any time in each of 2 consecutive months, the water supplier shall report the filter number, the turbidity measurement, and the dates on which the exceedance occurred. In addition, the water supplier shall arrange for the conduct of a comprehensive performance evaluation by the department or a third party approved by the department no later than 30 days following the exceedance and have the evaluation completed and submitted to the department no later than 90 days following the exceedance.

NR 809.80(8)(e)1.1. If at any time the turbidity exceeds 1 NTU on representative samples of filtered water in a public water system using conventional filtration treatment or direct filtration, the water supplier system shall inform the department as soon as possible, but no later than the end of the next business day.

NR 809.80(8)(e)2.2. If at any time the turbidity in representative samples of filtered water exceeds the maximum level set by the department under s. NR 810.29 (5) for filtration technologies other than conventional filtration treatment, direct filtration, slow sand filtration or diatomaceous earth filtration, the water supplier shall inform the department as soon as possible, but no later than the end of the next business day.

NR 809.80(9)(9) Waterborne disease reporting. Each water supplier, upon discovering that a waterborne disease outbreak potentially attributable to the water supplier’s 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(9m)(9m) Seasonal system start-up procedure reporting. Before serving water to the public, the water supplier for a seasonal public water system must certify to the department that it has complied with the department-approved start-up procedure.