Nitrite violations in Wisconsin
32 active public water systems in Wisconsin had a Nitrite violation in the past three years, 1 of them in the latest quarter of EPA's data. What Nitrite is and why it matters.
Systems with a Nitrite violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
First Presbyterian CH Oxford Oxford · Marquette County |
70 | 2 | 0 | |
|
West Bend Waterworks West Bend · Washington County |
32,149 | 5 | 0 | |
|
Augusta Waterworks Augusta · Eau Claire County |
1,450 | 8 | 0 | |
|
Stone Lake Community County |
851 | 3 | 0 | |
|
Eleva Waterworks Eleva · Trempealeau County |
635 | 10 | 0 | |
|
Wicked Events and Rodeo Arena Medford · Taylor County |
603 | 4 | 1 | |
|
Lakeview Specialty Hospital Waterford · Racine County |
484 | 9 | 2 | |
|
Embarrass Waterworks Embarrass · Waupaca County |
346 | 6 | 0 | |
|
Eden Meats and Corner Express Eden · Fond du Lac County |
285 | 6 | 0 | |
|
Gratiot Waterworks Gratiot · Lafayette County |
224 | 7 | 1 | |
|
WI Dnr Pen Welckers PT Fish Creek · Door County |
107 | 1 | 0 | |
|
Ludwell Estates Elkhorn · Walworth County |
100 | 6 | 1 | |
|
Lynn Dairy INC Granton · Clark County |
100 | 1 | 0 | |
|
Grande Custom Ingredients Juda · Green County |
64 | 8 | 2 | |
|
Menominee Cultural Museum County |
53 | 3 | 1 | |
|
Lakeside Ultimart Oshkosh · Winnebago County |
50 | 2 | 0 | |
|
Prototek Digital Manufacturing (madison) LLC Blue Mounds · Dane County |
40 | 5 | 1 | |
|
WI Dnr Copper Falls Picnic Area and Campground N Mellen · Ashland County |
40 | 2 | 1 | |
|
Blackwell Community County |
39 | 1 | 0 | |
|
Pearces Mobile Home Estates Mauston · Juneau County |
37 | 8 | 3 | |
|
Dollar General 25597 Saxeville Wild Rose · Waushara County |
35 | 2 | 0 | |
|
Dollar General Gilman 24615 Gilman · Taylor County |
27 | 2 | 1 | |
|
Dollar General 24987 Cecil · Shawano County |
25 | 1 | 0 | |
|
Door 44 Winery Sturgeon Bay · Door County |
25 | 3 | 0 | |
|
Firecrackers Bar & Grill Rose Tn · Waushara County |
25 | 3 | 0 | |
|
Giddyup Dalton · Green Lake County |
25 | 1 | 0 | |
|
Hoppers Bar Marion · Shawano County |
25 | 2 | 0 | |
|
Immanuel Lutheran CH Cecil · Shawano County |
25 | 1 | 0 | |
|
Kelly Lake Kwik Stop Spruce Tn · Oconto County |
25 | 3 | 0 | |
|
ST Marys Church Custer Custer · Portage County |
25 | 1 | 0 | |
|
WI Dnr Governor Thompson State PK Maint Bldg Stephenson Tn · Marinette County |
25 | 3 | 0 | |
|
Willows End Resort and Campground Hazelhurst · Oneida County |
25 | 1 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrite, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrite 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.