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 809.07 - Maximum contaminant level goals for primary contaminants

Current through June 24, 2024
(1) Maximum
				  contaminant level goals (MCLGs) are zero for the following contaminants:
Giardia lamblia
Cryptosporidium
Legionella
Escherichia coli
Viruses
Lead
Arsenic
Chloroform
Bromodichloromethane
Bromoform
Bromate
Dichloroacetic acid
Combined radium-226 and radium-228
Beta particle and photon radioactivity
Gross alpha particle activity (excluding radon and
					 uranium)
Uranium
(2) Maximum contaminant level goals (MCLGs)
				  which are less than the MCLs are as follows:
Contaminant
MCLG in mg/ L
Acrylamide
0.00001
Alachlor
0.0004
Benzene
0.001
Benzo[a]pyrene
0.000002
Carbon tetrachloride
0.0003
Chlordane
0.00003
Chlorite
0.8
Dibromochoromethane
0.06
Dibromochloropropane
0.00003
Di(2-ethylhexyl)phthalate
0.003
1,2-Dichloroethane
0.0004
1,2-Dichloropropane
0.0005
Epichlorohydrin
0.004
Ethylene Dibromide
0.0000004
Heptachlor
0.000008
Heptachlor Epoxide
0.000004
Hexachlorobenzene
0.00002
Pentachlorophenol
0.0003
Polychlorinated biphenyls (PCBs)
0.000005
2,3,7,8-TCDD (Dioxin)
2 x 10-10
Tetrachloroethylene
0.0007
Thallium
0.0005
Toxaphene
0.00003
1,1,2-Trichloroethane
0.003
Trichloroethylene
0.003
Vinyl chloride
0.000015
(3)
				  MCLGs which equal the MCLs are as follows:
Contaminant
MCLG in mg/ L
Atrazine, (total chlorinated
								  residue)1
0.003
Antimony
0.006
Asbestos
7 Million fibers/L (longer than 10
								  micrometers)
Barium
2
Beryllium
0.004
Cadmium
0.005
Carbofuran
0.04
Chromium
0.1
Copper
1.3
Cyanide(as free Cyanide)
0.2
2,4-D
0.07
Dalapon
0.2
o-Dichlorobenzene
0.6
para-Dichlorobenzene
0.075
1,1-Dichloroethylene
0.007
cis-1,2-Dichloroethylene
0.07
trans-1,2-Dichloroethylene
0.1
Dichloromethane
0.005
Di(2-ethylhexyl)adipate
0.4
Dinoseb
0.007
Diquat
0.02
Endothall
0.1
Endrin
0.002
Ethylbenzene
0.7
Fluoride
4.0
Glyphosate
0.7
Hexachlorocyclopentadiene
0.05
Lindane
0.0002
Mercury
0.002
Methoxychlor
0.04
Monochlorobenzene
0.1
Nickel
0.1
Nitrate
10 (as Nitrogen)
Nitrite
1 (as Nitrogen)
Nitrate+Nitrite
10 (as Nitrogen)
Oxamyl
0.2
Picloram
0.5
Selenium
0.05
Simazine
0.004
Styrene
0.1
Toluene
1
1,2,4-Trichlorobenzene
0.07
1,1,1-Trichloroethane
0.2
1 Atrazine, total chlorinated
					 residue includes atrazine and its metabolites, diaminoatrazine, diethylatrazine
					 and deisopropylatrazine.
(4)
				  If a contaminant is not detected in a sample and if the limit of detection is
				  higher than the MCLG, the MCLG shall be considered not to have been
				  exceeded.
(5) Notwithstanding any
				  other provisions of this chapter, if a contaminant listed in sub. (2) is
				  detected at a concentration above the MCLG but below the MCL for that
				  contaminant, the following shall apply:
(a)
				  The water supplier shall collect a confirmation sample to verify the presence
				  of the contaminant, unless collected by the department.
(b) Based upon verified results and following
				  a determination by the department on the need for further action as specified
				  in par. (c), the water supplier shall provide public information to its
				  customers indicating the analytical results achieved and the health effects of
				  ingesting the substance at the concentration found.
(c) The department may require the water
				  supplier to prepare and submit a report which does all of the following:
1. Assesses the cause and significance of the
				  problem.
2. Analyzes the cost,
				  effectiveness and feasibility of alternatives for treating the water or
				  developing alternative water sources.
(d) If, based on the conclusions of the
				  report if required under par. (c), the department determines that action is
				  necessary to protect public health, it may require the water supplier to treat
				  or replace the water source.