Wisconsin Administrative Code
Department of Natural Resources
NR 800 - Environmental Protection - Water Supply
Chapter NR 809 - Safe Drinking Water
Subchapter III - Maximum Contaminant Levels, Maximum Residual Disinfectant Levels, Monitoring, Analytical Requirements and Control of Disinfection Byproducts, Disinfection Residuals and Stage 1 and Stage 2 DBP
Section NR 809.567 - Reporting and recordkeeping requirements for disinfection byproducts and disinfection residuals for Stage 1 DBP

Universal Citation: WI Admin Code § NR 809.567

Current through August 26, 2024

(1) REPORTING REQUIREMENTS. Water suppliers for public water systems required to be sampled quarterly or more frequently shall report to the department within 10 days after the end of each quarter in which samples were collected, notwithstanding the provisions of s. NR 809.563. Water suppliers for public water systems required to be sampled less frequently than quarterly shall report to the department within 10 days after the end of each monitoring period in which samples were collected.

(2) REPORTING AND RECORDKEEPING REQUIREMENTS FOR DISINFECTION BYPRODUCTS. Water suppliers for public water systems monitored for disinfection byproducts shall report the information specified in the following requirements:

(a) Water supplier for public water systems monitored for TTHM and HAA5 under the requirements of s. NR 809.565(2) on a quarterly or more frequent basis shall report all of the following:

1. The number of samples taken during the last quarter.

2. The location, date and result of each sample taken during the last quarter.

3. The arithmetic average of all samples taken in the last quarter.

4. The annual arithmetic average of the quarterly arithmetic averages for the last 4 quarters.

5. Whether the MCL was exceeded, as determined according to s. NR 809.566(2).

(b) Water supplier for public water systems monitored for TTHMs and HAA5s under the requirements of s. NR 809.565(2) less frequently than quarterly but at least annually shall report all of the following:

1. The number of samples taken during the last year.

2. The location, date and result of each sample taken during the last quarter.

3. The arithmetic average of all samples taken over the last year.

4. Whether the MCL was exceeded, as determined according to s. NR 809.566(2).

(c) Water supplier for public water systems monitored for TTHMs and HAA5s under the requirements of s. NR 809.565(2) less frequently than annually shall report all of the following:

1. The location, date and result of the last sample taken.

2. Whether the MCL was exceeded, as determined according to s. NR 809.566(2).

(d) Water supplier for public water systems monitored for chlorite under the requirements of s. NR 809.565(3) (a) shall report all of the following:

1. The number of samples taken each month for the last 3 months.

2. The location, date and result of each sample taken during the last quarter.

3. For each month in the reporting period, the arithmetic average of all samples taken in each 3 sample set collected in the distribution system.

4. Whether, based on s. NR 809.566(2) (c), the MCL was exceeded, and how many times it was exceeded each month.

(e) Water supplier for public water systems monitored for bromate under the requirements of s. NR 809.565(3) (b) shall report all of the following:

1. The number of samples taken during the last quarter.

2. The location, date and result of each sample taken during the last quarter.

3. The arithmetic average of the monthly arithmetic averages of all samples taken in the last year.

4. Whether the MCL was exceeded, as determined according to s. NR 809.566(2) (b).

(3) REPORTING AND RECORDKEEPING REQUIREMENTS FOR DISINFECTANTS. Water supplier for public water systems monitored for disinfectants shall report the information specified in the following:

(a) Water supplier for public water systems monitored for chlorine or chloramines under the requirements of s. NR 809.565(4) (a) shall report all of the following:

1. The number of samples taken during each month of the last quarter.

2. The monthly arithmetic average of all samples taken in each month for the last 12 months.

3. The arithmetic average of all monthly averages for the last 12 months.

4. Whether the MRDL was exceeded, as determined according to s. NR 809.566(3) (a).

(b) Water supplier for public water systems monitored for chlorine dioxide under the requirements of s. NR 809.565(4) (b) shall report all of the following information:

1. The dates, results and locations of samples taken during the last quarter.

2. Whether the MRDL was exceeded, as determined according to s. NR 809.566(3) (b).

3. Whether the MRDL was exceeded in any 2 consecutive daily samples and whether the resulting violation was acute or nonacute as determined according to s. NR 809.566(3) (b).

(4) DISINFECTION BYPRODUCT PRECURSORS, ENHANCED COAGULATION OR ENHANCED SOFTENING TREATMENT SYSTEMS. Water supplier for public water systems containing disinfection byproduct precursors or using enhanced coagulation or enhanced softening, shall report the information specified in the following:

(a) Water supplier for public water systems monitored monthly or quarterly for TOC under the requirements of s. NR 809.565(5) and required to meet the enhanced coagulation or enhanced softening requirements in s. NR 809.569(1) (b) or (c) shall report all of the following:

1. The number of paired samples of source water and treated water, both prior to continuous disinfection, taken during the last quarter.

2. The location, date and result of each paired sample and associated alkalinity taken during the last quarter.

3. For each month in the reporting period that paired samples were taken, the arithmetic average of the percent reduction of TOC for each paired sample and the required TOC percent removal.

4. Calculations for determining compliance with the TOC percent removal requirements, as provided in s. NR 809.569(3).

5. Whether the public water system is in compliance with the enhanced coagulation or enhanced softening percent removal requirements in s. NR 809.569(1) for the last 4 quarters.

(b) Water supplier for public water systems monitored monthly or quarterly for TOC under the requirements of s. NR 809.565(5) and meeting one or more of the alternative compliance criteria in s. NR 809.569(2) (b) or (c) shall report all of the following:

1. The alternative compliance criterion that the water supplier for the public water system is using.

2. The number of paired samples taken during the last quarter.

3. The location, date and result of each paired sample and associated alkalinity taken during the last quarter.

4. The running annual arithmetic average based on monthly averages or quarterly samples of source water TOC for public water systems meeting a criterion in s. NR 809.569(2) (b) 1. and 3. or of treated water TOC for public water systems meeting the criterion in s. NR 809.569(2) (b) 2.

5. The running annual arithmetic average based on monthly averages or quarterly samples of source water SUVA for public water systems meeting the criterion in s. NR 809.569(2) (b) 6. or of treated water SUVA for public water systems meeting the criterion in s. NR 809.569(2) (b) 7.

6. The running annual average of source water alkalinity for public water systems meeting the criterion in s. NR 809.569(2) (b) 3. and 4. and of treated water alkalinity for public water systems meeting the criterion in s. NR 809.569(2) (c) 1.

7. The running annual average for both TTHM and HAA5 for public water systems meeting the criterion in s. NR 809.569(2) (b) 3., 4., and 5.

8. The running annual average of the amount of magnesium hardness removal (as CaCO3 mg/L) for public water systems meeting the criterion in s. NR 809.567(2) (c) 2.

9. Whether the public water system is in compliance with the particular alternative compliance criterion in s. NR 809.569(2) (b) and (c).

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