NR 809.207(1)(c)(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.

NR 809.207(1)(d)(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).

NR 809.207(1)(e)(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.

NR 809.207(2)(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.

NR 809.207(3)(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.

NR 809.24(1)(1) Applicability. The following maximum contaminant levels for volatile organic contaminants (VOC) apply to community water systems and non-transient, non-community water systems.

NR 809.24(2)(2) Best available treatment. The following are the BATs available for achieving compliance with the maximum contaminant level for the volatile organic chemicals listed in sub. (1):

NR 809.24(2)(b)(b) Central treatment using granular activated carbon, except for vinyl chloride and dichloromethane.

NR 809.24(3)(3) Alternative treatment. The department may approve the use of alternative treatment not listed in sub. (2), if a water supplier demonstrates to the department, using pilot studies or other means, that the alternative treatment is sufficient to achieve compliance with the MCLs in sub. (1).

NR 809.243(1)(1) Detection limits. For the purposes of this section, detection is defined as >0.0005 mg/l, except for vinyl chloride for which detection is defined as >0.0002 mg/L.

NR 809.243(2)(2) Analytical methods. Analysis for the volatile organic contaminants listed in s. NR 809.24 shall be conducted using the methods prescribed in Table E.

1 Procedures for Methods 502.2, 524.2, and 551.1 are in Methods for the Determination of Organic Compounds in Drinking Water Supplement III, EPA/600/R-95-131, August 1995. These documents are available from the National Technical Information Service (NTIS), U.S. Department of Commerce, 5285 Port Royal Road, Springfield, Virginia 22161. The toll free number is 1-800-553-6847.

2 EPA Method 524.3, Version 1.0. “Measurement of Purgeable Organic Compounds in Water by Capillary Column Gas Chromatography/Mass Spectrometry,” June 2009. EPA 815–B–09–009. Available at http://epa.gov/safewater/methods/analyticalmethods_ogwdw.html.

NR 809.243(3)(3) Sample collection. Samples shall be collected using containers, preservatives and holding times specified in s. NR 809.203 (4) Table D. In all cases, samples should be analyzed as soon after collection as possible.

NR 809.243(4)(4) 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 809.243(5)(5) Laboratory evaluation. Each certified laboratory shall determine the method detection limit (MDL) at which it is capable of detecting VOCs as defined in federal law under 40 CFR, Part 136, Appendix B. The maximum acceptable MDL is 0.0005 mg/L for all VOCs except vinyl chloride, which is 0.0002 mg/L.

NR 809.243 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 15-049: am. (1), (2) Table E footnotes, (5) Register March 2016 No. 723, eff. 4-1-16.

NR 809.245(1)(1) General. Water suppliers for community and non-transient non-community water systems shall monitor for the contaminants listed in s. NR 809.24 for purposes of determining compliance with the maximum contaminant levels as follows:

NR 809.245(1)(a)(a) Groundwater sources shall be sampled 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 location more representative of each source, treatment plant, or within the distribution system.