Groundwater Rule (GWR) violations in Wisconsin
20 active public water systems in Wisconsin had a Groundwater Rule (GWR) violation in the past three years, 20 of them in the latest quarter of EPA's data. What Groundwater Rule (GWR) is and why it matters.
Systems with a Groundwater Rule (GWR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Glendale Waterworks Glendale · Milwaukee County |
12,883 | 3 | 2 | |
|
Antigo Waterworks Antigo · Langlade County |
7,780 | 3 | 2 | |
|
Seven Mile Fair Expo Bldg Caledonia · Racine County |
999 | 1 | 1 | |
|
Seven Mile Fair Market Square Caledonia · Racine County |
999 | 1 | 1 | |
|
Laona Sanitary Dist Laona · Forest County |
950 | 4 | 2 | |
|
Hillcrest Estates MHP Altoona · Eau Claire County |
850 | 2 | 2 | |
|
Paris School Kenosha · Kenosha County |
300 | 1 | 1 | |
|
Butternut Waterworks Butternut · Ashland County |
283 | 6 | 3 | |
|
Sheldon Water Utility Sheldon · Rusk County |
265 | 6 | 1 | |
|
Kiltie INC Oconomowoc · Waukesha County |
200 | 1 | 1 | |
|
Norris INC Mukwonago · Waukesha County |
141 | 5 | 4 | |
|
Ludwell Estates Elkhorn · Walworth County |
100 | 6 | 1 | |
|
Caledonia Village Hall Caledonia · Racine County |
40 | 2 | 1 | |
|
Spring Green Estates South Spring Green · Sauk County |
40 | 2 | 1 | |
|
Pearces Mobile Home Estates Mauston · Juneau County |
37 | 8 | 3 | |
|
Arbor View Assisted Living 2 Burlington · Racine County |
35 | 5 | 3 | |
|
Lincoln Crest Apartments Twin Lakes · Kenosha County |
32 | 3 | 2 | |
|
Keyes Lake Mobile Home Park Florence · Florence County |
30 | 5 | 3 | |
|
Rays Boneyard Saloon Lena · Oconto County |
25 | 1 | 1 | |
|
Swetz Country Corner Blenker · Wood County |
25 | 2 | 2 |
About this data
A system is counted once if any of its violations in the past three years involved Groundwater Rule (GWR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Groundwater Rule (GWR) 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.