All water systems in Wisconsin
11,026 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Milwaukee Waterworks Milwaukee · Milwaukee County |
626,000 | 0 | 0 | |
|
Madison Water Utility Madison · Dane County |
272,000 | 2 | 1 | |
|
Green Bay Waterworks Green Bay · Brown County |
107,369 | 0 | 0 | |
|
Racine Waterworks Racine · Racine County |
105,100 | 1 | 1 | |
|
Kenosha Water Utility Kenosha · Kenosha County |
99,218 | 0 | 0 | |
|
Appleton Waterworks Menasha · Outagamie County |
74,511 | 3 | 1 | |
|
Waukesha Water Utility Waukesha · Waukesha County |
70,718 | 2 | 1 | |
|
Eau Claire Waterworks Eau Claire · Eau Claire County |
70,587 | 0 | 0 | |
|
Janesville Water Utility Janesville · Rock County |
64,415 | 0 | 0 | |
|
West Allis Waterworks West Allis · Milwaukee County |
63,240 | 0 | 0 | |
|
Oshkosh Waterworks Oshkosh · Winnebago County |
63,000 | 1 | 0 | |
|
LA Crosse Waterworks La Crosse · La Crosse County |
53,000 | 0 | 0 | |
|
Sheboygan Water Utilities Sheboygan · Sheboygan County |
49,931 | 2 | 1 | |
|
Wauwatosa Waterworks Wauwatosa · Milwaukee County |
49,064 | 0 | 0 | |
|
Fond DU Lac Waterworks Fond Du Lac · Fond du Lac County |
44,678 | 2 | 1 | |
|
Wausau Waterworks Wausau · Marathon County |
39,994 | 0 | 0 | |
|
Sun Prairie Utilities Sun Prairie · Dane County |
39,300 | 0 | 0 | |
|
Beloit City of Beloit · Rock County |
36,677 | 1 | 0 | |
|
North Shore Water Commission Glendale · Milwaukee County |
35,598 | 0 | 0 | |
|
Manitowoc Waterworks Manitowoc · Manitowoc County |
34,500 | 0 | 0 | |
|
West Bend Waterworks West Bend · Washington County |
32,149 | 5 | 0 | |
|
Oak Creek Waterworks Oak Creek · Milwaukee County |
32,104 | 2 | 1 | |
|
Fitchburg Utility Dist 1 Fitchburg · Dane County |
29,900 | 0 | 0 | |
|
Brookfield Water Utility Brookfield · Waukesha County |
29,070 | 2 | 0 | |
|
New Berlin Water Utility New Berlin · Waukesha County |
27,899 | 1 | 1 | |
|
Neenah Waterworks Neenah · Winnebago County |
27,506 | 0 | 0 | |
|
Stevens Point Waterworks Stevens Point · Portage County |
26,717 | 0 | 0 | |
|
Superior Water Light & Power Company Superior · Douglas County |
26,084 | 2 | 1 | |
|
DE Pere Waterworks SA 1 De Pere · Brown County |
25,660 | 0 | 0 | |
|
Watertown Waterworks Watertown · Jefferson County |
23,945 | 1 | 0 | |
|
Middleton Waterworks Middleton · Dane County |
23,868 | 3 | 1 | |
|
Menomonee Falls WW Surface Water Menomonee Falls · Waukesha County |
23,867 | 0 | 0 | |
|
Franklin Water Utility Franklin · Milwaukee County |
22,500 | 1 | 1 | |
|
Caledonia Water Utility Village of Caledonia · Racine County |
21,819 | 3 | 1 | |
|
Grand Chute TN San Dist 1 Grand Chute · Outagamie County |
21,583 | 2 | 0 | |
|
South Milwaukee Waterworks South Milwaukee · Milwaukee County |
21,340 | 0 | 0 | |
|
Howard Waterworks Green Bay · Brown County |
21,133 | 3 | 0 | |
|
Germantown Water Utility Germantown · Washington County |
20,027 | 2 | 1 | |
|
Wis Rapids Water Works & Lighting Comm Wisconsin Rapids · Wood County |
20,000 | 0 | 0 | |
|
Marshfield Utilities Marshfield · Wood County |
18,815 | 0 | 0 | |
|
Cudahy Waterworks Cudahy · Milwaukee County |
18,659 | 0 | 0 | |
|
Hudson Waterworks Hudson · St. Croix County |
18,558 | 3 | 1 | |
|
Onalaska Waterworks Onalaska · La Crosse County |
18,000 | 0 | 0 | |
|
Ashwaubenon Waterworks Green Bay · Brown County |
17,730 | 1 | 0 | |
|
Kaukauna Utilities Kaukauna · Outagamie County |
17,493 | 0 | 0 | |
|
Bellevue Waterworks Green Bay · Brown County |
16,715 | 2 | 1 | |
|
Beaver Dam Water Utility Beaver Dam · Dodge County |
16,200 | 1 | 1 | |
|
River Falls Waterworks River Falls · Pierce County |
16,000 | 2 | 1 | |
|
Weston Municipal Utilities Weston · Marathon County |
16,000 | 1 | 1 | |
|
Menomonie Waterworks Menomonie · Dunn County |
15,950 | 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.