Nitrate-Nitrite (Combined) violations in Wisconsin
19 active public water systems in Wisconsin had a Nitrate-Nitrite (Combined) violation in the past three years, 1 of them in the latest quarter of EPA's data. What Nitrate-Nitrite (Combined) is and why it matters.
Systems with a Nitrate-Nitrite (Combined) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Jimz Farmstand Juneau · Dodge County |
32 | 1 | 1 | |
|
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 | |
|
Lakeview Specialty Hospital Waterford · Racine County |
484 | 9 | 2 | |
|
West Koshkonong Lutheran Church Stoughton · Dane County |
352 | 1 | 0 | |
|
Eden Meats and Corner Express Eden · Fond du Lac County |
285 | 6 | 0 | |
|
Gratiot Waterworks Gratiot · Lafayette County |
224 | 7 | 1 | |
|
Ludwell Estates Elkhorn · Walworth County |
100 | 6 | 1 | |
|
ST Adalbert Catholic Church Rosholt · Portage County |
93 | 2 | 0 | |
|
School House Tavern Westfield · Marquette County |
81 | 1 | 0 | |
|
Grande Custom Ingredients Juda · Green County |
64 | 8 | 2 | |
|
Menominee Cultural Museum County |
53 | 3 | 1 | |
|
Mullins Cheese Marshfield · Marathon County |
40 | 3 | 1 | |
|
Blackwell Community County |
39 | 1 | 0 | |
|
Pearces Mobile Home Estates Mauston · Juneau County |
37 | 8 | 3 | |
|
Barrel Inn Ashland · Ashland County |
25 | 2 | 1 | |
|
Eagles Club Sparta · Monroe County |
25 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate-Nitrite (Combined), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate-Nitrite (Combined) 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.