NR 809.331(4)(b)(b) Water supplier for unfiltered public water systems are not required to conduct source water monitoring under this section if the public water system will provide a total of at least 3-log Cryptosporidium inactivation, equivalent to meeting the treatment requirements for unfiltered public water systems with a mean Cryptosporidium concentration of greater than 0.01 oocysts/L in s. NR 810.36.

NR 809.331(4)(c)(c) If a water supplier chooses to provide the level of treatment in par. (a) or (b), as applicable, rather than start source water monitoring, the water supplier shall notify the department in writing no later than the date the public water system is otherwise required to submit a sampling schedule for monitoring under s. NR 809.332. Alternatively, a water supplier may choose to stop sampling at any point after the public water system has initiated monitoring if the water supplier notifies the department in writing that the public water system will provide this level of treatment. Water supplier shall install and operate technologies to provide this level of treatment by the applicable treatment compliance date in s. NR 810.37.

NR 809.331(5)(5) Plants operating only part of the year. Water suppliers for public water systems with surface water treatment plants that operate for only part of the year shall conduct source water monitoring in accordance with this section, but with the following modifications:

NR 809.331(5)(a)(a) Water supplier shall sample their source water only during the months that the plant operates unless the department specifies another monitoring period based on plant operating practices.

NR 809.331(5)(b)(b) Water supplier for public water systems with plants that operate less than six months per year and that monitor for Cryptosporidium shall collect at least six Cryptosporidium samples per year during each of two years of monitoring. Samples shall be evenly spaced throughout the period the plant operates.

NR 809.331(6)(a)(a) A water supplier for a public water system that begins using a new source of surface water or GWUDI after the public water system is required to begin monitoring under sub. (3) shall monitor the new source on a schedule the department approves. Source water monitoring shall meet the requirements of this section. The public water system shall also meet the bin classification and Cryptosporidium treatment requirements of ss. NR 810.34 and 810.35 or s. NR 810.36, as applicable, for the new source on a schedule the department approves.

NR 809.331(6)(b)(b) The requirements of this section apply to public water systems with surface water treatment plants that begin operation after the monitoring start date applicable to the public water system’s size under sub. (3).

NR 809.331(6)(c)(c) The water supplier shall begin a second round of source water monitoring no later than 6 years following initial bin classification under s. NR 810.34 or determination of the mean Cryptosporidium level under s. NR 810.36, as applicable.

NR 809.331(7)(7) Monitoring violation. Failure to collect any source water sample required under this section in accordance with the sampling schedule, sampling location, analytical method, approved laboratory, and reporting requirements of s. NR 809.332 to s. NR 809.336 is a monitoring violation.

NR 809.331(8)(8) Grandfathering monitoring data. The water supplier may use monitoring data collected prior to the applicable monitoring start date in sub. (3) to meet the initial source water monitoring requirements in sub. (1). This data, referred to as grandfathered data, may substitute for an equivalent number of months of data at the end of the monitoring period. All data submitted under this section shall meet the requirements in s. NR 809.334.

NR 809.332(1)(1) Sampling schedules. Water suppliers for public water systems required to conduct source water monitoring under s. NR 809.331 shall submit a sampling schedule that specifies the calendar dates when the water supplier will collect each required sample.

NR 809.332(1)(a)(a) Water suppliers shall submit sampling schedules no later than 3 months prior to the applicable date listed in s. NR 809.331 (3), Table H, for each round of required monitoring.

NR 809.332(1)(b)(b) Water suppliers for public water systems serving at least 10,000 people shall submit their sampling schedule for the initial round of source water monitoring under s. NR 809.331 (1) to EPA. If a water supplier is unable to submit the sampling schedule electronically, the water supplier may use an alternative approach for submitting the sampling schedule subject to EPA approval.

NR 809.332(1)(c)(c) Water suppliers for public water systems serving fewer than 10,000 people shall submit their sampling schedules for the initial round of source water monitoring under s. NR 809.331 (1) to the EPA or the department.

NR 809.332(1)(d)(d) Water suppliers shall submit sampling schedules for the second round of source water monitoring under s. NR 809.331 (2) to the department.

NR 809.332(1)(e)(e) If EPA or the department does not respond to a water supplier regarding its sampling schedule, the water supplier shall sample at the reported schedule.

NR 809.332(2)(2) Sample collection. Water suppliers shall collect samples no later than two days before or two days later than the dates indicated in their sampling schedule. Thus samples shall be collected within a five-day period around the scheduled date, unless one of the conditions of par. (a) or (b) applies.

NR 809.332(2)(a)(a) If an extreme condition or situation exists that may pose danger to the sample collector, or that cannot be avoided and causes the water supplier to be unable to sample in the scheduled five-day period, the water supplier shall sample as close to the scheduled date as feasible unless the department approves an alternative sampling date. The water supplier shall submit an explanation for the delayed sampling date to the department concurrent with the shipment of the sample to the laboratory.

NR 809.332(2)(b)(b) If a water supplier is unable to report a valid analytical result for a scheduled sampling date due to equipment failure, loss of or damage to the sample, failure to comply with the analytical method requirements, including the quality control requirements in s. NR 809.334, or the failure of an approved laboratory to analyze the sample, then the water supplier shall collect a replacement sample. The water supplier shall collect the replacement sample no later than 21 days after receiving information that an analytical result cannot be reported for the scheduled date unless the water supplier demonstrates that collecting a replacement sample within this time frame is not feasible or the department approves an alternative resampling date. The water supplier shall submit an explanation for the delayed sampling date to the department concurrent with the shipment of the sample to the laboratory.

NR 809.332(3)(3) Revising sampling schedules. Water supplier for public water systems that fail to meet the criteria of sub. (2) for any source water sample required under s. NR 809.331 shall revise their sampling schedules to add dates for collecting all missed samples. The water supplier shall submit the revised schedule to the department for approval before the water supplier begins collecting the missed samples.

NR 809.333(1)(1) General requirements. Water suppliers for public water systems required to conduct source water monitoring under s. NR 809.331 shall collect samples for each plant that treats a surface water or GWUDI source. Where multiple plants draw water from the same influent, such as the same pipe or intake, the department may approve one set of monitoring results to be used to satisfy the requirements of s. NR 809.331 for all plants.

NR 809.333(2)(2) Sample collection location. The water supplier shall collect source water samples prior to chemical treatment, such as coagulants, oxidants and disinfectants, unless the public water system meets the condition of this subsection. The department may approve a water supplier to collect a source water sample after chemical treatment if the department determines that collecting a sample prior to chemical treatment is not feasible for the public water system and that the chemical treatment is unlikely to have a significant adverse effect on the analysis of the sample.

NR 809.333(3)(3) Recycled filter backwash. Water suppliers for public water systems that recycle filter backwash water shall collect source water samples prior to the point of filter backwash water. All public water systems that recycle filter backwash water shall comply with all of the requirements under ss. NR 810.295, 811.860, and 811.862.