All water systems in Wisconsin
11,026 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sheboygan TN Waterworks Sheboygan · Sheboygan County |
4,596 | 0 | 0 | |
|
Dodgeville Waterworks Dodgeville · Iowa County |
4,583 | 0 | 0 | |
|
Oconto Waterworks Oconto · Oconto County |
4,583 | 2 | 0 | |
|
Mauston Waterworks Mauston · Juneau County |
4,456 | 2 | 1 | |
|
Baldwin Waterworks Baldwin · St. Croix County |
4,440 | 1 | 0 | |
|
Oneida #1 or Site #1 County |
4,393 | 1 | 0 | |
|
Viroqua Waterworks Viroqua · Vernon County |
4,362 | 0 | 0 | |
|
Medford Waterworks Medford · Taylor County |
4,318 | 2 | 0 | |
|
Kewaskum Waterworks Kewaskum · Washington County |
4,309 | 0 | 0 | |
|
Saukville Waterworks Saukville · Ozaukee County |
4,268 | 0 | 0 | |
|
Prescott Waterworks Prescott · Pierce County |
4,258 | 0 | 0 | |
|
Chilton Waterworks Chilton · Calumet County |
4,191 | 2 | 0 | |
|
Cross Plains Waterworks Cross Plains · Dane County |
4,100 | 1 | 0 | |
|
Bloomfield, Village of Pell Lake · Walworth County |
4,071 | 5 | 1 | |
|
Pulaski Waterworks Pulaski · Brown County |
4,040 | 0 | 0 | |
|
Prairie DU Sac Waterworks Prairie Du Sac · Sauk County |
4,006 | 2 | 1 | |
|
Keshena County |
3,960 | 0 | 0 | |
|
Algoma TN Sanitary Dist 1 Oshkosh · Winnebago County |
3,935 | 0 | 0 | |
|
Kiel Waterworks Kiel · Manitowoc County |
3,932 | 1 | 0 | |
|
Cabelas Richfield Richfield · Washington County |
3,931 | 0 | 0 | |
|
Lancaster Waterworks Lancaster · Grant County |
3,907 | 0 | 0 | |
|
Yorkville Utility Dist 1 Sturtevant · Racine County |
3,900 | 3 | 0 | |
|
Marshall Waterworks Marshall · Dane County |
3,862 | 0 | 0 | |
|
Wrightstown Waterworks Wrightstown · Brown County |
3,815 | 1 | 0 | |
|
Hobart Waterworks S a 1 Hobart · Brown County |
3,758 | 1 | 0 | |
|
Arcadia Waterworks Arcadia · Trempealeau County |
3,737 | 0 | 0 | |
|
Waupun Correctional Inst Waupun · Dodge County |
3,706 | 2 | 1 | |
|
Horicon Waterworks Horicon · Dodge County |
3,682 | 0 | 0 | |
|
Bloomer Waterworks Bloomer · Chippewa County |
3,680 | 2 | 1 | |
|
Omro Waterworks Omro · Winnebago County |
3,629 | 1 | 0 | |
|
Combined Locks Waterworks Combined Locks · Outagamie County |
3,609 | 3 | 1 | |
|
Black River Falls Waterworks Black River Falls · Jackson County |
3,608 | 3 | 1 | |
|
Seymour Waterworks Seymour · Outagamie County |
3,601 | 0 | 0 | |
|
Waterloo Waterworks Waterloo · Jefferson County |
3,520 | 2 | 1 | |
|
Sauk City Waterworks Sauk City · Sauk County |
3,518 | 1 | 0 | |
|
Stanley Waterworks Stanley · Chippewa County |
3,500 | 2 | 0 | |
|
Barron Light & Water Dept Barron · Barron County |
3,423 | 1 | 0 | |
|
Peshtigo Waterworks Peshtigo · Marinette County |
3,420 | 3 | 0 | |
|
Mosinee Waterworks Mosinee · Marathon County |
3,406 | 1 | 1 | |
|
Somerset Waterworks Somerset · St. Croix County |
3,334 | 3 | 1 | |
|
Johnson Creek Waterworks Johnson Creek · Jefferson County |
3,318 | 4 | 1 | |
|
Ellsworth Waterworks Ellsworth · Pierce County |
3,304 | 2 | 2 | |
|
Brillion Waterworks Brillion · Calumet County |
3,262 | 0 | 0 | |
|
Freedom Sanitary District Freedom · Outagamie County |
3,260 | 1 | 0 | |
|
WI Dot Rest Area 12 Dekorra West Bound Poynette · Columbia County |
3,255 | 0 | 0 | |
|
Boscobel Waterworks Boscobel · Grant County |
3,237 | 0 | 0 | |
|
Wisconsin Dells Waterworks Wisconsin Dells · Columbia County |
3,232 | 2 | 0 | |
|
Algoma Waterworks Algoma · Kewaunee County |
3,219 | 0 | 0 | |
|
Brodhead Waterworks Brodhead · Green County |
3,216 | 0 | 0 | |
|
Rothschild Waterworks Rothschild · Marathon County |
3,190 | 2 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.
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.