NR 809.328(1)(b) (b) Unless the department invalidates an E. coli-positive groundwater source sample collected under s. NR 809.325, a public water system is in violation of the treatment technique requirement under s. NR 809.327 if within 120 days or earlier if directed by the department, the conditions of subd. 1. or 2 are not met.

NR 809.328(1)(b)1. 1. The water supplier does not complete corrective action in accordance with any applicable department plan review processes under chs. NR 811 and 812, including department specified interim measures.

NR 809.328(1)(b)2. 2. The public water system is not in compliance with a department-approved corrective action plan and schedule.

NR 809.328(1)(c) (c) A water supplier for a groundwater system subject to the requirements of s. NR 809.327 (4) that fails to maintain at least 4-log treatment of viruses before or at the first customer for a groundwater source is in violation of the treatment technique requirement if the failure is not corrected within 4 hours of determining the public water system is not maintaining at least 4-log treatment of viruses before or at the first customer.

NR 809.328(2) (2) public notification for treatment technique violations. Water suppliers for groundwater systems shall give public notification under s. NR 809.952 for the treatment technique violations specified under this section.

NR 809.328 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 15-049: am. (1) (b) (intro.) Register March 2016 No. 723, eff. 4-1-16.

NR 809.329 NR 809.329 Reporting and recordkeeping requirements for groundwater systems.

NR 809.329(1) (1) Reporting. In addition to the requirements of ss. NR 809.31 and 809.80, a water supplier for a groundwater system regulated under s. NR 809.32 shall provide the following information to the department:

NR 809.329(1)(a) (a) A water supplier for a groundwater system conducting compliance monitoring under s. NR 809.327 (3) shall notify the department any time the public water system fails to meet any department-specified requirements including, but not limited to, minimum residual disinfectant concentration, membrane operating criteria or membrane integrity, and alternative treatment operating criteria, if the operation is not restored in accordance with the criteria or requirements within four hours. The water supplier shall notify the department as soon as possible, but in no case later than the end of the next business day after the failure.

NR 809.329(1)(b) (b) After completing any corrective action under s. NR 809.327 (2), a water supplier shall notify the department within 30 days of completion of the corrective action.

NR 809.329(2) (2) Recordkeeping. In addition to the requirements of s. NR 809.80, a water supplier for a public water system regulated under s. NR 809.32 shall maintain the following information in its records:

NR 809.329(2)(a) (a) Documentation of corrective actions. Documentation shall be kept for a period of not less than ten years.

NR 809.329(2)(b) (b) Documentation of notice to the public as required under s. NR 809.80. Documentation shall be kept for a period of not less than three years.

NR 809.329(2)(c) (c) Records of decisions under s. NR 809.325 (4) and records of invalidation of an E. coli-positive groundwater source sample under s. NR 809.323 (2). Documentation shall be kept for a period of not less than five years.

NR 809.329(2)(d) (d) For consecutive systems, documentation of notification to its wholesale systems of total-coliform positive samples that are not invalidated under s. NR 809.31 (3). Documentation shall be kept for a period of not less than five years.

NR 809.329(2)(e) (e) For public water systems, including wholesale systems, which are required to perform compliance monitoring under s. NR 809.327 (4) all of the following apply:

NR 809.329(2)(e)1. 1. Records of the department specified minimum disinfectant residual. Documentation shall be kept for a period of not less than ten years.

NR 809.329(2)(e)2. 2. Records of the lowest daily residual disinfectant concentration and records of the date and duration of any failure to maintain the department prescribed minimum residual disinfectant concentration for a period of more than four hours. Documentation shall be kept for a period of not less than five years.

NR 809.329(2)(e)3. 3. Records of department-specified compliance requirements for membrane filtration and of parameters specified by the department for department-approved alternative treatment and records of the date and duration of any failure to meet the membrane operating, membrane integrity, or alternative treatment operating requirements for more than 4 hours. Documentation shall be kept for a period of not less than five years.

NR 809.329 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 15-049: am. (2) (c), (d), (e) (intro.) Register March 2016 No. 723, eff. 4-1-16.

NR 809.33 NR 809.33 Surface water microbiological organisms and indicators.

NR 809.33(1) (1) General requirements. The requirements in this section establish or extend treatment techniques in lieu of maximum contaminant levels for Cryptosporidium. These requirements are in addition to requirements for filtration and disinfection in subch. II of ch. NR 810.

NR 809.33(2) (2) Applicability. These requirements apply to all surface water and GWUDI public water systems.

NR 809.33(2)(a) (a) Wholesale systems that supply water from a surface water or GWUDI source shall comply with the requirements of this section based on the population of the largest public water system in the combined distribution system.

NR 809.33(2)(b) (b) The requirements of this section for filtered public water systems apply to all public water systems required by s. NR 810.29 to provide filtration treatment, whether or not the public water system is currently operating a filtration system.

NR 809.33(2)(c) (c) The requirements of this section for unfiltered public water systems apply only to unfiltered public water systems that met and continue to meet the filtration avoidance criteria in s. NR 810.30 as applicable.

NR 809.33(3) (3) Requirements. Public water systems subject to this section shall comply with the following requirements:

NR 809.33(3)(a) (a) The following monitoring is required under this section:

NR 809.33(3)(a)1. 1. Water suppliers shall have conducted and submitted to EPA an initial round of source water monitoring for treatment plants existing as of January 5, 2006 under 40 CFR part 141 National Primary Drinking Water Regulations Subpart W that determined the level of treatment for Cryptosporidium needed under s. NR 810.34.