All water systems in Wisconsin
11,026 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Randolph Water Dept Randolph · Columbia County |
1,800 | 2 | 1 | |
|
Menomonee Falls WW Groundwater Menomonee Falls · Waukesha County |
1,796 | 0 | 0 | |
|
Fall River Waterworks Fall River · Columbia County |
1,793 | 2 | 1 | |
|
Cameron Waterworks Cameron · Barron County |
1,787 | 1 | 1 | |
|
Palmyra Waterworks Palmyra · Jefferson County |
1,756 | 0 | 0 | |
|
Mazomanie Waterworks Mazomanie · Dane County |
1,744 | 1 | 0 | |
|
Whiting Waterworks Stevens Point · Portage County |
1,743 | 0 | 0 | |
|
Osseo Waterworks Osseo · Trempealeau County |
1,701 | 1 | 0 | |
|
Marathon City Waterworks Marathon City · Marathon County |
1,695 | 2 | 1 | |
|
Galesville Waterworks Galesville · Trempealeau County |
1,679 | 2 | 0 | |
|
Kettle Moraine High School & Wales Elem School Wales · Waukesha County |
1,670 | 2 | 1 | |
|
Shorewood Hills Waterworks Madison · Dane County |
1,670 | 3 | 1 | |
|
Homestead High School Mequon · Ozaukee County |
1,650 | 1 | 0 | |
|
Stratford Waterworks Stratford · Marathon County |
1,643 | 3 | 1 | |
|
Cambridge Water & Sewer Utility Cambridge · Dane County |
1,638 | 3 | 1 | |
|
Thorp Waterworks Thorp · Clark County |
1,636 | 2 | 1 | |
|
Spring Green Waterworks Spring Green · Sauk County |
1,626 | 0 | 0 | |
|
Fox Lake Waterworks Fox Lake · Dodge County |
1,610 | 1 | 1 | |
|
WI Dot Rest Area 63 Lomira South Bound Lomira · Dodge County |
1,601 | 0 | 0 | |
|
WI Dot Rest Area 64 Lomira North Bound Lomira · Dodge County |
1,601 | 0 | 0 | |
|
Random Lake Waterworks Random Lake · Sheboygan County |
1,594 | 0 | 0 | |
|
Fleet Farm Muskego Main Store Muskego · Waukesha County |
1,585 | 0 | 0 | |
|
Darien Waterworks Darien · Walworth County |
1,573 | 0 | 0 | |
|
Elkhart Lake Waterworks Elkhart Lake · Sheboygan County |
1,567 | 0 | 0 | |
|
Red Cliff North County |
1,562 | 4 | 0 | |
|
Niagara Waterworks Niagara · Marinette County |
1,561 | 0 | 0 | |
|
Federal Correctional Institution Oxford · Adams County |
1,550 | 2 | 1 | |
|
Quad Graphics Lomira · Dodge County |
1,550 | 0 | 0 | |
|
Sharon Waterworks Sharon · Walworth County |
1,549 | 4 | 3 | |
|
Kettle Moraine Correctional Institution Plymouth · Sheboygan County |
1,544 | 0 | 0 | |
|
Eagle River Waterworks Eagle River · Vilas County |
1,530 | 3 | 1 | |
|
Brooklyn Waterworks Brooklyn · Green County |
1,524 | 0 | 0 | |
|
Cleveland Waterworks Cleveland · Manitowoc County |
1,524 | 2 | 0 | |
|
McDonalds Mequon Mequon · Ozaukee County |
1,524 | 1 | 1 | |
|
Bangor Waterworks Bangor · La Crosse County |
1,520 | 0 | 0 | |
|
River Bend Resort Watertown · Jefferson County |
1,520 | 0 | 0 | |
|
Hurley Waterworks Hurley · Iron County |
1,515 | 3 | 1 | |
|
Concordia University Mequon · Ozaukee County |
1,500 | 2 | 1 | |
|
Independence Waterworks Independence · Trempealeau County |
1,500 | 0 | 0 | |
|
Black Earth Waterworks Black Earth · Dane County |
1,493 | 2 | 0 | |
|
Edgar Waterworks Edgar · Marathon County |
1,491 | 2 | 1 | |
|
Bonduel Waterworks Bonduel · Shawano County |
1,475 | 0 | 0 | |
|
Orfordville Waterworks Orfordville · Rock County |
1,475 | 0 | 0 | |
|
Phillips Waterworks Phillips · Price County |
1,473 | 2 | 1 | |
|
Grantsburg Waterworks Grantsburg · Burnett County |
1,460 | 2 | 1 | |
|
Muscoda Waterworks Muscoda · Grant County |
1,453 | 0 | 0 | |
|
Augusta Waterworks Augusta · Eau Claire County |
1,450 | 8 | 0 | |
|
Mishicot Waterworks Mishicot · Manitowoc County |
1,432 | 0 | 0 | |
|
West Baraboo Waterworks West Baraboo · Sauk County |
1,414 | 0 | 0 | |
|
Spring Valley Waterworks Spring Valley · Pierce County |
1,409 | 0 | 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.