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

Universal Citation: WI Admin Code ยง NR 809.07

Current through August 26, 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.

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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