All water systems in Wisconsin
11,026 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Ladysmith Waterworks Ladysmith · Rusk County |
3,184 | 0 | 0 | |
|
Tomahawk Waterworks Tomahawk · Lincoln County |
3,180 | 2 | 2 | |
|
Lodi Waterworks Lodi · Columbia County |
3,146 | 3 | 1 | |
|
Sherwood Waterworks Sherwood · Calumet County |
3,114 | 4 | 1 | |
|
Oostburg Waterworks Oostburg · Sheboygan County |
3,110 | 0 | 0 | |
|
Lake Como Sanitary Dist 1 Lake Geneva · Walworth County |
3,038 | 0 | 0 | |
|
Dry Town County |
3,030 | 0 | 0 | |
|
Hortonville Water Utility Hortonville · Outagamie County |
3,028 | 3 | 0 | |
|
New Holstein Waterworks New Holstein · Calumet County |
3,012 | 0 | 0 | |
|
Woodside Sports Complex Mauston · Juneau County |
3,008 | 0 | 0 | |
|
WI Dot Rest Area 22 Turtle Beloit · Rock County |
3,005 | 0 | 0 | |
|
Park Falls Waterworks Park Falls · Price County |
2,993 | 0 | 0 | |
|
Amery Waterworks Amery · Polk County |
2,962 | 3 | 2 | |
|
Lac DU Flambeau County |
2,962 | 1 | 0 | |
|
Lake Delton Waterworks Lake Delton · Sauk County |
2,914 | 1 | 0 | |
|
Oconto Falls Waterworks Oconto Falls · Oconto County |
2,892 | 2 | 0 | |
|
Kewaunee Waterworks Kewaunee · Kewaunee County |
2,848 | 1 | 0 | |
|
South-Central Water System County |
2,805 | 1 | 0 | |
|
Mendota Mental Health Inst Madison · Dane County |
2,787 | 1 | 1 | |
|
Rome Water Utility Nekoosa · Adams County |
2,775 | 1 | 0 | |
|
Genoa City Waterworks Genoa City · Walworth County |
2,766 | 2 | 0 | |
|
Luxemburg Waterworks Luxemburg · Kewaunee County |
2,737 | 1 | 0 | |
|
Belleville Waterworks Belleville · Green County |
2,712 | 0 | 0 | |
|
Lomira Waterworks Lomira · Dodge County |
2,701 | 4 | 1 | |
|
Brockway Sanitary Dist 1 Black River Falls · Jackson County |
2,692 | 0 | 0 | |
|
Denmark Waterworks Denmark · Brown County |
2,684 | 3 | 1 | |
|
Osceola Waterworks Osceola · Polk County |
2,680 | 2 | 1 | |
|
Mondovi Waterworks Mondovi · Buffalo County |
2,667 | 1 | 0 | |
|
Spooner Waterworks Spooner · Washburn County |
2,653 | 1 | 0 | |
|
Juneau Waterworks Juneau · Dodge County |
2,627 | 2 | 1 | |
|
Williams Bay Waterworks Williams Bay · Walworth County |
2,601 | 2 | 2 | |
|
Hayward Water Utility Hayward · Sawyer County |
2,552 | 0 | 0 | |
|
New Lisbon Waterworks New Lisbon · Juneau County |
2,526 | 2 | 1 | |
|
Poynette Waterworks Poynette · Columbia County |
2,520 | 3 | 0 | |
|
Deerfield Waterworks Deerfield · Dane County |
2,510 | 0 | 0 | |
|
Fennimore Waterworks Fennimore · Grant County |
2,507 | 2 | 2 | |
|
WI Dot Rest Area 11 Dekorra East Bound Poynette · Columbia County |
2,505 | 0 | 0 | |
|
WI Dot Rest Area 17 Milton Janesville · Rock County |
2,503 | 0 | 0 | |
|
Abbotsford Waterworks Abbotsford · Marathon County |
2,502 | 3 | 2 | |
|
Winneconne Waterworks Winneconne · Winnebago County |
2,502 | 4 | 1 | |
|
Belgium Waterworks Belgium · Ozaukee County |
2,493 | 2 | 0 | |
|
Mineral Point Waterworks Mineral Point · Iowa County |
2,487 | 3 | 2 | |
|
Westby Waterworks Westby · Vernon County |
2,400 | 3 | 1 | |
|
Nekoosa Waterworks Nekoosa · Wood County |
2,394 | 0 | 0 | |
|
Neillsville Waterworks Neillsville · Clark County |
2,384 | 2 | 1 | |
|
Lakeland Sanitary Dist 1 Minocqua · Oneida County |
2,381 | 4 | 1 | |
|
Dousman Water Utility Dousman · Waukesha County |
2,350 | 3 | 0 | |
|
New Glarus Waterworks New Glarus · Green County |
2,348 | 2 | 1 | |
|
Cumberland Waterworks Cumberland · Barron County |
2,311 | 0 | 0 | |
|
Walworth Waterworks Walworth · Walworth County |
2,304 | 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.