Wis. Admin. Code Department of Natural Resources NR 809.07

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Current through September 30, 2024

Section NR 809.07 - Maximum contaminant level goals for primary contaminants

(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.

Wis. Admin. Code Department of Natural Resources NR 809.07

CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.

Amended by, CR 15-049: am. (1) Register March 2016 No. 723, eff.4/1/2016