Nitrate violations in Wisconsin
226 active public water systems in Wisconsin had a Nitrate violation in the past three years, 9 of them still unresolved. What Nitrate is and why it matters.
Health effects: Methemoglobinemia in infants under 6 months: gut bacteria convert nitrate to nitrite, which blocks oxygen transport in blood. Pregnant women should also take precautions. Chronic adult exposure at elevated levels may increase cancer risk.
Systems with a Nitrate violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Amherst Waterworks Amherst · Portage County |
1,119 | 3 | 1 | |
|
Nordic Mountain Bistro Lodge Wild Rose · Waushara County |
220 | 1 | 1 | |
|
Buliks Mobile Home Park Spooner · Washburn County |
93 | 4 | 1 | |
|
ST Adalbert Catholic Church Rosholt · Portage County |
93 | 2 | 0 | |
|
Willow Springs Garden Wausau · Marathon County |
50 | 1 | 0 | |
|
Hidden Acres Mobile PK 2 Arbor Vitae · Vilas County |
39 | 1 | 0 | |
|
Little Toes Daycare Center Alma Center · Jackson County |
35 | 1 | 0 | |
|
Kelly Lake Kwik Stop Spruce Tn · Oconto County |
25 | 3 | 0 | |
|
Sauk Prairie Trap and Skeet Club Prairie Du Sac · Sauk County |
25 | 1 | 1 | |
|
Brookfield Water Utility Brookfield · Waukesha County |
29,070 | 2 | 0 | |
|
Whitewater Waterworks Whitewater · Walworth County |
14,000 | 2 | 0 | |
|
Tomah Waterworks Tomah · Monroe County |
9,192 | 1 | 0 | |
|
Plymouth Utilities Plymouth · Sheboygan County |
8,964 | 1 | 0 | |
|
Prairie Village Water Trust North Prairie · Waukesha County |
2,100 | 3 | 0 | |
|
Red Cliff North County |
1,562 | 4 | 0 | |
|
Lone Rock Waterworks Lone Rock · Richland County |
895 | 1 | 0 | |
|
Stone Lake Community County |
851 | 3 | 0 | |
|
Cambria Waterworks Cambria · Columbia County |
767 | 1 | 0 | |
|
Ridgeway Waterworks Ridgeway · Iowa County |
690 | 3 | 0 | |
|
Madison Country Day School Waunakee · Dane County |
660 | 2 | 0 | |
|
Carter Community County |
634 | 1 | 0 | |
|
WI Dnr Devils Lake Upper Ice Age Campground Baraboo · Sauk County |
500 | 1 | 0 | |
|
Lakeview Specialty Hospital Waterford · Racine County |
484 | 9 | 2 | |
|
Kendall Waterworks Kendall · Monroe County |
458 | 4 | 3 | |
|
Manor Hill Mobile Home Park Eden · Fond du Lac County |
400 | 1 | 0 | |
|
WI Dnr Harrington Beach Shower Bldg Belgium · Ozaukee County |
400 | 1 | 0 | |
|
Readstown Waterworks Readstown · Vernon County |
395 | 3 | 0 | |
|
Embarrass Waterworks Embarrass · Waupaca County |
346 | 6 | 0 | |
|
Wilderness Crossing Travel Cntr Wittenberg · Shawano County |
313 | 3 | 0 | |
|
Browntown Waterworks Browntown · Green County |
256 | 7 | 1 | |
|
Red Cabin at Green Acres Fond Du Lac · Fond du Lac County |
254 | 2 | 0 | |
|
Lake Wisconsin Country Club Prairie Du Sac · Columbia County |
250 | 2 | 0 | |
|
Dairy State Cheese Rudolph · Wood County |
235 | 1 | 0 | |
|
Richards of Dunbar Dunbar Tn · Marinette County |
220 | 3 | 1 | |
|
Plum Petroleum LLC Plum City · Pierce County |
202 | 3 | 0 | |
|
Smoke and Spice Stephenson Tn · Marinette County |
200 | 3 | 1 | |
|
Dairyfood USA INC Blue Mounds · Dane County |
160 | 4 | 0 | |
|
Church of Jesus Christ of Latter-Day Saints Sun Prairie · Dane County |
150 | 1 | 0 | |
|
Country Cove Court LLC Hudson · St. Croix County |
150 | 2 | 0 | |
|
Indian Shores Front Shower Woodruff · Oneida County |
150 | 3 | 0 | |
|
WI Dnr Harrington Beach Campground Handpump Belgium · Ozaukee County |
150 | 1 | 0 | |
|
Village Bar Cuba City · Grant County |
129 | 3 | 1 | |
|
Black Frog Grill LLC Sullivan · Jefferson County |
125 | 1 | 0 | |
|
Deer Trail Village Mosinee · Marathon County |
120 | 7 | 0 | |
|
Franklin MHP Franklin · Milwaukee County |
118 | 3 | 1 | |
|
Station 44 Markesan · Green Lake County |
115 | 2 | 0 | |
|
Anchorage Cove Condos East Parking Egg Harbor · Door County |
113 | 3 | 0 | |
|
Americinn Dodgeville · Iowa County |
112 | 4 | 0 | |
|
Schleichers Chute Inn LLC Suring · Oconto County |
110 | 3 | 1 | |
|
Four Seasons Resort Beecher Tn · Marinette County |
110 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Wisconsin records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.