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 809.562 - General requirements for disinfection byproducts and disinfection residuals Stage 1 DBP

Current through June 24, 2024
(1) GENERAL. The following requirements
				  establish criteria under which water supplier for community water systems, or
				  CWSs, and nontransient, noncommunity water systems, or NTNCWSs, which add a
				  chemical disinfectant to the water in any part of the drinking water treatment
				  process shall modify their practices to meet MCLs and MRDLs in s.
				  NR
				  809.561(2) and (3) (a), respectively,
				  and shall meet the treatment technique requirements for disinfection byproduct
				  precursors in s.
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				  809.561(4). Water suppliers for
				  transient noncommunity water systems, or TNCWSs, that use chlorine dioxide as a
				  disinfectant or oxidant shall modify their practices to meet the MRDL for
				  chlorine dioxide in s.
				  NR
				  809.561(3) (a) according to the
				  criteria established in this section. MCLs have been established for TTHM and
				  HAA5 and treatment technique requirements for disinfection byproduct precursors
				  to limit the levels of known and unknown disinfection byproducts which may have
				  adverse health effects. These disinfection byproducts may include chloroform,
				  bromodichloromethane, dibromochloromethane, bromoform, dichloroacetic acid, and
				  trichloroacetic acid.
(2)
				  COMPLIANCE TIMEFRAMES. Unless otherwise noted, all public water systems shall
				  comply with the requirements of this subchapter as follows:
(a) All public water systems serving 10,000
				  or more persons that are CWSs or NTNCWSs and that are supplied by a surface
				  water source or by a groundwater source under the direct influence of surface
				  water shall comply with this subchapter beginning January 1, 2002.
(b) Public water systems serving fewer than
				  10,000 persons that are CWSs or NTNCWSs and that are supplied by a surface
				  water source or by a groundwater source under the direct influence of surface
				  water and all public water systems using only groundwater not under the direct
				  influence of surface water shall comply with this subchapter beginning January
				  1, 2004.
(c) Public water systems
				  serving 10,000 or more persons that are transient NCWSs and use chlorine
				  dioxide as a disinfectant or oxidant and are supplied by a surface water source
				  or by a groundwater source under the direct influence of surface water shall
				  comply with any requirements for chlorine dioxide and chlorite in this
				  subchapter beginning January 1, 2002.
(d) Public water systems that are transient
				  NCWSs and use chlorine dioxide as a disinfectant or oxidant and that serve
				  fewer than 10,000 persons and are supplied by a surface water source or by a
				  groundwater source under the direct influence of surface water or that are
				  public water systems using only groundwater not under the direct influence of
				  surface water shall comply with any requirements for chlorine dioxide in this
				  subchapter beginning January 1, 2004.
(e) A consecutive system that does not add a
				  disinfectant but delivers water that has been treated with a primary or
				  residual disinfectant other than ultraviolet light, shall comply with
				  analytical and monitoring requirements for chlorine and chloramines in s.
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				  809.565(6) (a) and the compliance
				  requirements in s.
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				  809.566(3) (a) beginning April 1,
				  2009 and shall report monitoring results under s.
				  NR
				  809.567(3).