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National Drinking Water Database


Nitrate & nitrite in Wisconsin


Nitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, and erosion of natural deposits.

The Most Polluted Communities in Wisconsin

3,797 water utilities reported detecting Nitrate & nitrite in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Nitrate & nitrite level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Tree Acres Golf Course- Clubhouse
Plover, WI
505 of 519.76 ppm
(18 to 20.9 ppm)
2Willys Pub & Grill
Marathon, WI
754 of 418.5 ppm
(16.2 to 19.9 ppm)
3Postles Skate City
Rice Lake, WI
1004 of 418.35 ppm
(16.3 to 20.3 ppm)
4Marine Corps League
Beloit, WI
524 of 418.18 ppm
(17.4 to 19.6 ppm)
5Foxboro Golf Club Ltd
Oregon, WI
1684 of 418.13 ppm
(17.4 to 18.8 ppm)
6Ursa Logistics
Janesville, WI
504 of 418 ppm
(17.3 to 18.7 ppm)
7Bonnet Prairie Lutheran Church
Rio, WI
1004 of 417.93 ppm
(16.6 to 18.7 ppm)
8Mary's Home Cooking
Beloit, WI
583 of 316.67 ppm
(14.6 to 19.5 ppm)
9North Scott Baptist Church
Pardeeville, WI
1024 of 416.48 ppm
(15.7 to 17.9 ppm)
10Liberty Pole United Methodist
Viroqua, WI
654 of 416.45 ppm
(14.3 to 20.6 ppm)

Health Based Limits for Nitrate & nitrite

StandardDescriptionLevel
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.10 ppm
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.10 ppm
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.10 ppm

Violation Summary for Nitrate & nitrite in Wisconsin

There are no violations reported for this contaminant in Wisconsin