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 809.68 - Reporting and recordkeeping requirements for Stage 2 DBP
Universal Citation: WI Admin Code ยง NR 809.68
Current through August 26, 2024
(1) REPORTING.
(a) Water suppliers shall report all of the
following information for each monitoring location to the department no later
than 10 days after the end of any quarter in which monitoring is required:
1. Number of samples taken during the
quarter.
2. Date and results of
each sample taken during the quarter.
3. Arithmetic average of quarterly results
for the four quarters immediately previous for each monitoring location (LRAA),
beginning at the end of the fourth calendar quarter that follows the compliance
date and at the end of each subsequent quarter. If the LRAA calculated based on
fewer than four quarters of data would cause the MCL to be exceeded regardless
of the monitoring results of subsequent quarters, the water supplier shall
report this information to the department as part of the first report due
following the compliance date or anytime thereafter that this determination is
made. If the public water system is required to conduct monitoring at a
frequency that is less than quarterly, the water supplier shall make compliance
calculations beginning with the first compliance sample taken after the
compliance date, unless the public water system is required to conduct
increased monitoring under s.
NR 809.63(2).
4. If the MCL for TTHM or HAA5s was violated
at any monitoring location.
5. Any
operational evaluation levels that were exceeded during the quarter and, if so,
the location and date, and the calculated TTHM and HAA5 levels.
(b) Water suppliers for surface
water or groundwater under the direct influence of surface water systems
seeking to qualify for or remain on reduced TTHM or HAA5 monitoring, shall
report the following source water TOC information for each treatment plant that
treats surface water or groundwater under the direct influence of surface water
to the department no later than 10 days after the end of any quarter in which
monitoring is required:
1. The number of
source water TOC samples taken each month during the previous
quarter.
2. The date and result of
each sample taken during the previous quarter.
3. The quarterly average of monthly samples
taken during the previous quarter or the result of the quarterly
sample.
4. The running annual
average (RAA) of quarterly averages from the past four quarters.
5. Whether the RAA exceeded 4.0
mg/L.
(c) The department
may choose to perform calculations and determine whether the MCL was exceeded
or the public water system is eligible for reduced monitoring in lieu of having
the water supplier report that information
(2) RECORDKEEPING. The water supplier shall retain any s. NR 809.62 monitoring plans and monitoring results collected under s. NR 809.61 as required by s. NR 809.82.
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