All water systems in Wisconsin
11,026 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Delavan Waterworks Delavan · Walworth County |
9,028 | 1 | 0 | |
|
Rice Lake Waterworks Rice Lake · Barron County |
9,012 | 1 | 0 | |
|
Plymouth Utilities Plymouth · Sheboygan County |
8,964 | 1 | 0 | |
|
Sheboygan Falls Utilities Sheboygan Falls · Sheboygan County |
8,687 | 1 | 1 | |
|
Pewaukee City Water and Sewer Utility Pewaukee · Waukesha County |
8,671 | 2 | 1 | |
|
Monona Waterworks Monona · Dane County |
8,624 | 0 | 0 | |
|
Jackson Waterworks Jackson · Washington County |
8,397 | 3 | 0 | |
|
Rhinelander Water & Wastewater Rhinelander · Oneida County |
8,234 | 2 | 1 | |
|
Mukwonago Waterworks Mukwonago · Waukesha County |
8,190 | 1 | 1 | |
|
Pewaukee Village Waterworks Pewaukee · Waukesha County |
8,166 | 2 | 1 | |
|
Muskego Water Utility Muskego · Waukesha County |
8,150 | 3 | 1 | |
|
Waupun Utilities Waupun · Dodge County |
8,056 | 0 | 0 | |
|
Ashland Water Utility Ashland · Ashland County |
8,000 | 3 | 0 | |
|
Jefferson Waterworks Jefferson · Jefferson County |
7,926 | 3 | 1 | |
|
Antigo Waterworks Antigo · Langlade County |
7,780 | 3 | 2 | |
|
MT Horeb Waterworks Mount Horeb · Dane County |
7,756 | 1 | 1 | |
|
Ripon Water Utility Ripon · Fond du Lac County |
7,716 | 2 | 1 | |
|
Kimberly Waterworks Kimberly · Outagamie County |
7,608 | 2 | 0 | |
|
Ledgeview TN Sanitary Dist 2 De Pere · Brown County |
7,602 | 2 | 0 | |
|
New London Waterworks New London · Waupaca County |
7,187 | 2 | 1 | |
|
Lake Geneva Utility Commission Lake Geneva · Walworth County |
7,107 | 1 | 1 | |
|
Kronenwetter Water & Sewer Utility Kronenwetter · Marathon County |
6,931 | 3 | 1 | |
|
Fox Point Waterworks Fox Point · Milwaukee County |
6,808 | 0 | 0 | |
|
Lake Hallie Waterworks Village of Chippewa Falls · Chippewa County |
6,701 | 4 | 2 | |
|
Town of Brookfield San Dist 4 Brookfield · Waukesha County |
6,419 | 1 | 0 | |
|
Rib Mountain Water Utility Wausau · Marathon County |
6,398 | 0 | 0 | |
|
Lake Mills Waterworks Lake Mills · Jefferson County |
6,211 | 2 | 2 | |
|
Waupaca Waterworks Waupaca · Waupaca County |
6,062 | 3 | 0 | |
|
Prairie DU Chien Waterworks Prairie Du Chien · Crawford County |
6,005 | 1 | 1 | |
|
Evansville Waterworks Evansville · Rock County |
5,703 | 2 | 0 | |
|
Slinger Water Utility Slinger · Washington County |
5,659 | 2 | 1 | |
|
Milton Waterworks Milton · Rock County |
5,588 | 0 | 0 | |
|
Berlin Waterworks Berlin · Green Lake County |
5,524 | 0 | 0 | |
|
Edgerton Waterworks Edgerton · Rock County |
5,512 | 2 | 1 | |
|
Harrison Utilities-Fka Waverly SD Menasha · Calumet County |
5,500 | 0 | 0 | |
|
HO Chunk Casino Baraboo · Sauk County |
5,486 | 0 | 0 | |
|
North Fond DU Lac Waterworks North Fond Du Lac · Fond du Lac County |
5,414 | 3 | 1 | |
|
Lawrence Waterworks De Pere · Brown County |
5,398 | 0 | 0 | |
|
Waterford Waterworks Waterford · Racine County |
5,368 | 3 | 1 | |
|
Sand Pillow County |
5,230 | 0 | 0 | |
|
Columbus Utilities Columbus · Columbia County |
5,173 | 2 | 1 | |
|
Mayville Waterworks Mayville · Dodge County |
5,112 | 0 | 0 | |
|
Richland Center Waterworks Richland Center · Richland County |
5,100 | 2 | 1 | |
|
East Troy Waterworks East Troy · Walworth County |
5,054 | 0 | 0 | |
|
West Salem Waterworks West Salem · La Crosse County |
5,045 | 0 | 0 | |
|
Shawano LK San Dist 1 Shawano · Shawano County |
4,950 | 1 | 1 | |
|
Union Grove Waterworks Union Grove · Racine County |
4,900 | 2 | 1 | |
|
Suamico Waterworks Suamico · Brown County |
4,697 | 0 | 0 | |
|
Clintonville Utilities Clintonville · Waupaca County |
4,635 | 2 | 1 | |
|
Windsor Water Utility South Windsor · Dane County |
4,607 | 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.