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 809.33 - Surface water microbiological organisms and indicators
Universal Citation: WI Admin Code ยง NR 809.33
Current through August 26, 2024
(1) GENERAL REQUIREMENTS. The requirements in this section establish or extend treatment techniques in lieu of maximum contaminant levels for Cryptosporidium. These requirements are in addition to requirements for filtration and disinfection in subch. II of ch. NR 810.
(2) APPLICABILITY. These requirements apply to all surface water and GWUDI public water systems.
(a) Wholesale systems that supply water from
a surface water or GWUDI source shall comply with the requirements of this
section based on the population of the largest public water system in the
combined distribution system.
(b)
The requirements of this section for filtered public water systems apply to all
public water systems required by s.
NR 810.29 to provide filtration treatment, whether or not
the public water system is currently operating a filtration system.
(c) The requirements of this section for
unfiltered public water systems apply only to unfiltered public water systems
that met and continue to meet the filtration avoidance criteria in s.
NR 810.30 as applicable.
(3) REQUIREMENTS. Public water systems subject to this section shall comply with the following requirements:
(a) The following monitoring is required
under this section:
1. Water suppliers shall
have conducted and submitted to EPA an initial round of source water monitoring
for treatment plants existing as of January 5, 2006 under 40 CFR part 141
National Primary Drinking Water Regulations Subpart W that determined the level
of treatment for Cryptosporidium needed under s.
NR 810.34.
2.
Water suppliers shall conduct source water monitoring as part of the treatment
approval process for plants constructed after January 5, 2006 under s.
NR 811.21(1)
(f). This monitoring shall include
Cryptosporidium, E. coli, and turbidity to determine what
level of Cryptosporidium treatment shall be provided using the
requirements of the bin classifications under s.
NR 810.34.
3.
A second round of source water monitoring for each plant that treats a surface
water or GWUDI source shall be conducted by the water supplier and submitted to
the department as required in s.
NR 809.331(2). This monitoring may
include sampling for Cryptosporidium, E. coli, and turbidity
as described in ss.
NR 809.331 to 809.336, to determine what level, if
any, of additional Cryptosporidium treatment the public water
system shall provide.
(b) Water suppliers that plan to make a
significant change to the disinfection practice at a public water system shall
develop disinfection profiles and calculate disinfection benchmarks, as
described in s.
NR 810.32.
(c) Water suppliers for filtered public water
systems shall determine their Cryptosporidium treatment bin
classification as described in s.
NR 810.34 and provide additional treatment for
Cryptosporidium, if required, as described in s.
NR 810.35. All unfiltered public water systems shall
provide treatment for Cryptosporidium as described in s.
NR 810.36. Filtered and unfiltered public water systems
shall implement Cryptosporidium treatment according to the
schedule in s.
NR 810.37.
(d) Water suppliers for public water systems
with an uncovered finished water storage facilities shall comply with the
requirements to cover the facility or treat the discharge from the facility as
described in s.
NR 810.28.
(e) Water suppliers for public water systems
required to provide additional treatment for Cryptosporidium
shall implement microbial toolbox options that are designed and operated as
described in ss.
NR 810.41 to 810.46.
(f) Water supplier shall comply with the
applicable recordkeeping and reporting requirements described in ss.
NR 809.336 and 809.82.
(4) SURFACE WATER TREATMENT TECHNIQUE VIOLATIONS. Surface water and GWUDI public water systems are in violation of the treatment technique requirements for turbidity if any of the requirements of s. NR 810.29(1) to (4) are not met.
Disclaimer: These regulations may not be the most recent version. Wisconsin may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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