NR 809.833(3)(c)4.c.c. When compliance with the MCL is determined on a public water system-wide basis by calculating a running annual average of all samples at all sampling points: the average and range of detection expressed in the same units as the MCL.

NR 809.833 NoteNote: When rounding of results to determine compliance with the MCL is allowed by the regulations, rounding should be done prior to multiplying the results by the factor listed in Appendix A of this subchapter.

NR 809.833(3)(c)5.b.b. When it is reported pursuant to s. NR 810.29, the highest monthly value. The report should include an explanation of the reasons for measuring turbidity.

NR 809.833(3)(c)5.c.c. When it is reported pursuant to s. NR 810.29, the highest single measurement and the lowest monthly percentage of samples meeting the turbidity limits specified in s. NR 810.29 for the filtration technology being used. The report should include an explanation of the reasons for measuring turbidity.

NR 809.833(3)(c)6.6. For lead and copper: the 90th percentile value of the most recent round of sampling and the number of sampling sites exceeding the action level.

NR 809.833(3)(c)7.7. For E. coli analytical results under s. NR 809.31, the total number of positive samples.

NR 809.833(3)(c)8.8. The likely sources of detected contaminants to the best of the water supplier’s knowledge. Specific information regarding contaminants may be available in sanitary surveys and source water assessments, and should be used when available to the water supplier. If the water supplier lacks specific information on the likely source, the report shall include one or more of the typical sources for that contaminant listed in Appendix A to this subchapter that are most applicable to the public water system.

NR 809.833(3)(d)(d) If a community water system distributes water to its customers from multiple hydraulically independent distribution systems that are fed by different raw water sources, the table should contain a separate column for each service area and the report should identify each separate distribution system. Alternatively, water suppliers could produce separate reports tailored to include data for each service area.

NR 809.833(3)(e)(e) The tables shall clearly identify any data indicating violations of MCLs or treatment techniques and the report shall contain a clear and readily understandable explanation of the violation including: the length of the violation, the potential adverse health effects, and actions taken by the water supplier to address the violation. To describe the potential health effects, the water supplier shall use the relevant language of Appendix A to this subchapter.

NR 809.833(3)(f)(f) For detected unregulated contaminants for which monitoring is required, except Cryptosporidium, the tables shall contain the average and range at which the contaminant was detected. The report may include a brief explanation of the reasons for monitoring for unregulated contaminants.

NR 809.833(4)(a)(a) If the water supplier has performed any monitoring for Cryptosporidium, including monitoring performed to satisfy the requirements of 40 CFR sub. D, part 141, s. 141.143 (information collection rule), which indicates that Cryptosporidium may be present in the source water or the finished water, the report shall include all of the following:

NR 809.833(4)(b)(b) If the water supplier has performed any monitoring for radon which indicates that radon may be present in the finished water, the report shall include all of the following:

NR 809.833(4)(c)(c) If the water supplier has performed additional monitoring which indicates the presence of other contaminants in the finished water, the report shall include all of the following:

NR 809.833(4)(c)2.2. An explanation of the significance of the results noting the existence of a health advisory or a proposed regulation.

NR 809.833 NoteNote: To determine the significance of the results it is recommended that water supplier call the Safe Drinking Water Hotline at 800–426–4791.

NR 809.833(5)(5) Compliance with all drinking water regulations. In addition to the requirements of sub. (3) (f), the report shall note any violation that occurred during the year covered by the report of a requirement listed in this subsection. The report also shall include a clear and readily understandable explanation of the violation, any potential adverse health effects, and the steps the water supplier has taken to correct the violation. All of the following violations shall be included:

NR 809.833(5)(a)(a) Failure to comply with requirements for monitoring and reporting of compliance data.

NR 809.833(5)(b)(b) For public water systems which have failed to install adequate filtration or disinfection equipment or processes, or have had a failure of the equipment or processes which constitutes a violation, the report shall include the following language as part of the explanation of potential adverse health effects. Inadequately treated water may contain disease-causing organisms. These organisms include bacteria, viruses and parasites, which can cause symptoms such as nausea, cramps, diarrhea and associated headaches.

NR 809.833(5)(c)(c) Lead and copper control requirements that are prescribed by subch. II. For public water systems that fail to take one or more actions prescribed by s. NR 809.541 (4), 809.542, 809.543, 809.544 or 809.545, the report shall include the applicable language of Appendix A to this subchapter for lead, copper or both.

NR 809.833(5)(d)(d) Treatment techniques for Acrylamide and Epichlorohydrin that are prescribed by subch. I. For public water systems that violate the requirements of s. NR 809.25 (4), the report shall include the relevant language from Appendix A to this subchapter.