NR 809.203(3)(a)(a) Each water supplier that monitors for PCBs shall have each sample analyzed by a laboratory certified under ch. NR 149 using Method 505, 508, 508.1 or 525.2 as specified in Table CM and must achieve the required detection limits in this subsection.

NR 809.203(3)(b)(b) If one or more of 7 PCB Aroclors are detected as designated in this paragraph in any sample analyzed using Methods 505 and 508, the sample shall be reanalyzed using Method 508A to quantitate PCBs as decachlorobiphenyl.

NR 809.203(3)(c)(c) Compliance with the PCB MCL shall be determined based upon the quantitative results of analyses using Method 508A.

NR 809.203(4)(4) Sample collection. Samples shall be collected using containers and preservatives, and meeting the holding times specified in Table D. When an approved method that is not included in Table D is used to analyze samples, samples shall be collected using containers and preservatives, and meeting the holding times specified in the approved method. In all cases, samples should be analyzed as soon after collection as possible.

2 Chlorinated samples need to be dechlorinated at the time of collection. Samplers should follow the dechlorinating procedures contained in the approved methods.

NR 809.203(5)(5) Laboratory certification. Analyses under this section shall only be conducted by laboratories that have received certification under ch. NR 149 or have been approved by EPA.

NR 809.203 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 15-049: am. (1), (2), renum. (2) Table C to Table CM and am, am. (3) (a), (4) (intro.), r. and recr. (4) Table D Register March 2016 No. 723, eff. 4-1-16; CR 21-088: am. (1) Table, (2) Table CM, (4) Table D Register July 2022 No. 799, eff. 8-1-22; correction in Table CM, D made under s. 35.17, Stats., Register July 2022 No. 799.

NR 809.205(1)(1) General. Water suppliers for community and non-transient non-community water systems shall monitor for the synthetic organic contaminants listed in s. NR 809.20 for the purposes of determining compliance with the maximum contaminant levels as follows:

NR 809.205(1)(a)(a) Groundwater sources shall be sampled under normal operating conditions at every entry point to the distribution system which is representative of each well after treatment. Each sample shall be taken at the same location unless, if approved by the department, conditions make another sampling location more representative of each source or treatment plant.

NR 809.205(1)(b)(b) Surface water sources or combined surface water and groundwater sources shall be sampled at each entry point to the distribution system after treatment, or at locations in the distribution system that are representative of each source after treatment. Each sample shall be taken at the same sampling location unless, if approved by the department, conditions make another sampling location more representative of each source or treatment plant.

NR 809.205(1)(c)(c) If the public water system draws water from more than one source and the sources are combined before distribution, the public water system shall be sampled at an entry point to the distribution system during periods of normal operating conditions when water representative of all sources is being used.

NR 809.205(1)(d)(d) The water supplier for all new public water systems or for public water systems that use a new source of water that begin operation after January 22, 2004 shall demonstrate compliance with the MCLs specified in s. NR 809.20 in accordance with the requirements in this section. The water supplier shall also comply with the initial sampling frequencies specified by the department to ensure the public water system can demonstrate compliance with the MCLs. Routine and increased monitoring frequencies shall be conducted in accordance with the requirements of this section.

NR 809.205(1g)(a)(a) Community and non-transient non-community public water systems serving a population of 50,000 or more shall comply with initial monitoring requirements under sub. (1r) (a) for perfluorooctane sulfonic acid and perfluorooctanoic acid beginning on November 1, 2022.

NR 809.205(1g)(b)(b) Community and non-transient non-community public water systems serving a population of 10,000 to 49,999 shall comply with initial monitoring requirements under sub. (1r) (a) for perfluorooctane sulfonic acid and perfluorooctanoic acid beginning on February 1, 2023.

NR 809.205(1g)(c)(c) Community and non-transient non-community public water systems serving a population of less than 10,000 shall comply with initial monitoring requirements under sub. (1r) (a) for perfluorooctane sulfonic acid and perfluorooctanoic acid beginning on May 1, 2023.

NR 809.205(1r)(1r) Monitoring frequency for perfluorooctane sulfonic acid and perfluorooctanoic acid. Water suppliers shall monitor to determine compliance with the maximum contaminant level for perfluorooctane sulfonic acid and perfluorooctanoic acid at the following frequencies:

NR 809.205(1r)(a)(a) Initial monitoring. Water suppliers for new community public water systems or for community public water systems with new sources shall demonstrate compliance with the MCLs prior to initiating water service. Water suppliers for each community and non-transient, non-community water system shall take 4 consecutive quarterly samples for perfluorooctane sulfonic acid and perfluorooctanoic acid beginning on the dates specified under sub. (1g) or beginning with the year the public water system initiates water service, or a new source is put into service, and every compliance period thereafter unless the requirements of pars. (b) and (c) are met.

NR 809.205(1r)(b)(b) Initial waiver evaluation. For perfluorooctane sulfonic acid and perfluorooctanoic acid the department may waive the final 2 quarters of initial monitoring for a sampling point if the results of the samples from the previous 2 quarters are below the detection limit.

NR 809.205(1r)(c)(c) Routine monitoring. Sampling may be reduced to routine monitoring after the initial monitoring period as follows:

NR 809.205(1r)(c)1.1. ‘Public water systems serving greater than 3,300.’ Public water systems serving more than 3,300 persons that do not detect a contaminant in the initial compliance period or during 3 consecutive years of annual monitoring may reduce the sampling frequency to a minimum of 2 quarterly samples in one year during each repeat compliance period.

NR 809.205(1r)(c)2.2. ‘Public water systems serving 3,300 or less.’ Public water systems serving 3,300 persons or less that do not detect a contaminant in the initial compliance period or during 3 consecutive years of annual monitoring may reduce the sampling frequency to a minimum of one sample during each repeat compliance period.

NR 809.205(1r)(d)(d) Waiver request. Water suppliers for community and non-transient non-community systems may apply to the department for a waiver from the requirements under pars. (a) and (c) for perfluorooctane sulfonic acid and perfluorooctanoic acid. A water supplier shall reapply for a waiver for each compliance period. The waiver period shall not exceed 2 compliance periods.

NR 809.205(1r)(e)(e) Waiver evaluation. The department may grant a waiver from the requirements under pars. (a) and (c) after evaluating all of the following factors:

NR 809.205(1r)(e)1.1. ‘Waiver evaluation when the department determines a contaminant has not been used.’ The department may grant a waiver when the department determines a contaminant has not been used based on a system’s previous use information, including transport, storage, or disposal of the contaminant within the watershed or zone of influence of the public water system, or the results of analysis of a system’s water source.

NR 809.205(1r)(e)2.2. ‘Waiver evaluation when a contaminant has been used or its use is unknown.’ If previous use of the contaminant is unknown or it has been used previously, all of the following factors shall be used to determine whether a waiver is granted: