Radium-226 violations in Wisconsin
17 active public water systems in Wisconsin had a Radium-226 violation in the past three years, 6 of them in the latest quarter of EPA's data. What Radium-226 is and why it matters.
Systems with a Radium-226 violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Verona Waterworks Verona · Dane County |
14,030 | 3 | 1 | |
|
Pewaukee Village Waterworks Pewaukee · Waukesha County |
8,166 | 2 | 1 | |
|
Medford Waterworks Medford · Taylor County |
4,318 | 2 | 0 | |
|
Southern Wisconsin Center Union Grove · Racine County |
950 | 4 | 0 | |
|
Argyle Waterworks Argyle · Lafayette County |
823 | 2 | 0 | |
|
Wheeler Waterworks Assoc Wheeler · Dunn County |
317 | 5 | 2 | |
|
North Fond DU Lac Waterworks North Fond Du Lac · Fond du Lac County |
5,414 | 3 | 1 | |
|
Augusta Waterworks Augusta · Eau Claire County |
1,450 | 8 | 0 | |
|
Barneveld Waterworks Barneveld · Iowa County |
1,258 | 4 | 1 | |
|
Eleva Waterworks Eleva · Trempealeau County |
635 | 10 | 0 | |
|
Gresham Waterworks Gresham · Shawano County |
534 | 3 | 0 | |
|
Readstown Waterworks Readstown · Vernon County |
395 | 3 | 0 | |
|
Ludwell Estates Elkhorn · Walworth County |
100 | 6 | 1 | |
|
Wiota Sanitary District South Wayne · Lafayette County |
98 | 2 | 0 | |
|
Cottage Glen Condominiums Ellison Bay · Door County |
52 | 1 | 0 | |
|
Marshview Terrace Waupun · Dodge County |
40 | 3 | 1 | |
|
Keyes Lake Mobile Home Park Florence · Florence County |
30 | 5 | 3 |
About this data
A system is counted once if any of its violations in the past three years involved Radium-226, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Radium-226 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.