Diquat violations in Wisconsin
19 active public water systems in Wisconsin had a Diquat violation in the past three years. What Diquat is and why it matters.
Health effects: Chronic exposure to diquat is associated with cataracts and kidney damage in animal studies. Acute high-level exposure causes gastrointestinal distress. EPA has not classified diquat as a human carcinogen. Individuals with kidney conditions may be at elevated risk from chronic exposure.
Systems with a Diquat violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
West Bend Waterworks West Bend · Washington County |
32,149 | 5 | 0 | |
|
Middleton Waterworks Middleton · Dane County |
23,868 | 3 | 1 | |
|
Fredonia Waterworks Fredonia · Ozaukee County |
2,279 | 1 | 0 | |
|
Weyauwega Waterworks Weyauwega · Waupaca County |
1,820 | 1 | 0 | |
|
Augusta Waterworks Augusta · Eau Claire County |
1,450 | 8 | 0 | |
|
Eleva Waterworks Eleva · Trempealeau County |
635 | 10 | 0 | |
|
Lakeview Specialty Hospital Waterford · Racine County |
484 | 9 | 2 | |
|
Embarrass Waterworks Embarrass · Waupaca County |
346 | 6 | 0 | |
|
Gratiot Waterworks Gratiot · Lafayette County |
224 | 7 | 1 | |
|
Eagle Chateau Apts Kenosha · Kenosha County |
125 | 3 | 2 | |
|
Grande Cheese Company Juda · Green County |
110 | 4 | 1 | |
|
Northland Mission Dunbar · Marinette County |
75 | 7 | 0 | |
|
Boardwalk MHC New London · Waupaca County |
71 | 2 | 0 | |
|
Grande Custom Ingredients Juda · Green County |
64 | 8 | 2 | |
|
Hillside County |
63 | 3 | 0 | |
|
Bit O Green LLC MHP Arena · Iowa County |
49 | 5 | 1 | |
|
Colonial Gardens Homes Fond Du Lac · Fond du Lac County |
48 | 5 | 0 | |
|
Sand Hill County |
38 | 2 | 0 | |
|
Pearces Mobile Home Estates Mauston · Juneau County |
37 | 8 | 3 |
About this data
A system is counted once if any of its violations in the past three years involved Diquat, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Diquat 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.