Wisconsin Administrative Code
Department of Natural Resources
NR 800 - Environmental Protection - Water Supply
Chapter NR 809 - Safe Drinking Water
Subchapter I - Maximum Contaminant Levels, Monitoring and Analytical Requirements for Primary Drinking Water Contaminants
Section NR 809.207 - Compliance requirements for synthetic organic contaminants

Universal Citation: WI Admin Code § NR 809.207

Current through August 26, 2024

(1) MCL COMPLIANCE DETERMINATION. Compliance with synthetic organic contaminant MCLs shall be determined as follows:

(a) Compliance with the synthetic organic contaminant MCLs specified in s. NR 809.20 shall be determined based on the analytical results obtained at each entry point. If one entry point is in violation of an MCL, the public water system is in violation of the MCL.

(b) For public water systems which are conducting monitoring more frequently than annual, compliance is determined by a running annual average of all samples taken at each entry point. If the annual average of any entry point is greater than the MCL, then the public water system is out of compliance. If the initial sample or a subsequent sample would cause the annual average to be exceeded, then the public water system is out of compliance immediately.

(c) If monitoring is conducted annually or less frequently, the public water system is out of compliance if the level of a contaminant at any entry point is greater than the MCL. Compliance shall be based on the average value of the initial sample and the confirmation sample.

(d) Any contaminant listed in s. NR 809.20 that is detected shall be quantified. Any sample below the reported method detection limit shall be calculated at zero for the purposes of determining the averages in pars. (b) and (c).

(e) If a public water system fails to collect the required number of samples, compliance shall be based on the total number of samples collected.

(2) DETECTION OF SYNTHETIC CONTAMINANTS NOT LISTED IN S. NR 809.20(1). Any detection of a synthetic organic contaminant not listed in s. NR 809.20(1) shall be reported to the department with the other monitoring reports required under this section. The laboratory shall indicate whether any detected synthetic organic contaminant not listed in s. NR 809.20(1) has been confirmed or tentatively identified, and when a numerical result is reported, whether the result is quantitative or an estimate.

(3) USE OF ANALYTICAL RESULTS. The department may determine compliance or initiate enforcement action based upon analytical results and other information compiled by their sanctioned representatives and agencies.

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