All water systems in Wisconsin
11,026 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Kwik Trip #973 Sussex · Waukesha County |
1,404 | 0 | 0 | |
|
WI Dot Rest Area 81 Southbound Westfield · Marquette County |
1,400 | 0 | 0 | |
|
Cornell Waterworks Cornell · Chippewa County |
1,390 | 1 | 0 | |
|
Woodville Waterworks Woodville · St. Croix County |
1,386 | 1 | 0 | |
|
New Berlin West Middle High School New Berlin · Waukesha County |
1,380 | 0 | 0 | |
|
Markesan Waterworks Markesan · Green Lake County |
1,365 | 0 | 0 | |
|
Cadott Waterworks Cadott · Chippewa County |
1,352 | 0 | 0 | |
|
Southern Door Sch Dist Brussels · Door County |
1,350 | 0 | 0 | |
|
WI Dot Rest Area 82 Northbound Westfield · Marquette County |
1,350 | 0 | 0 | |
|
Maple Bluff Waterworks Madison · Dane County |
1,342 | 1 | 1 | |
|
Black Creek Waterworks Black Creek · Outagamie County |
1,336 | 0 | 0 | |
|
Elroy Waterworks Elroy · Juneau County |
1,333 | 0 | 0 | |
|
Montello Waterworks Montello · Marquette County |
1,329 | 4 | 1 | |
|
Hillsboro Waterworks Hillsboro · Vernon County |
1,325 | 1 | 0 | |
|
Fox Bros Piggly Wiggly INC Hubertus Hubertus · Washington County |
1,314 | 1 | 0 | |
|
Loyal Waterworks Loyal · Clark County |
1,308 | 0 | 0 | |
|
Manawa Waterworks Manawa · Waupaca County |
1,300 | 3 | 1 | |
|
Marion Waterworks Marion · Waupaca County |
1,293 | 0 | 0 | |
|
Hertel West County |
1,281 | 1 | 0 | |
|
Blair Waterworks Blair · Trempealeau County |
1,280 | 0 | 0 | |
|
Fall Creek Waterworks Fall Creek · Eau Claire County |
1,269 | 4 | 1 | |
|
Road Ranger Travel Center Cottage Grove · Dane County |
1,267 | 0 | 0 | |
|
Gillett Waterworks Gillett · Oconto County |
1,264 | 0 | 0 | |
|
Theresa Waterworks Theresa · Dodge County |
1,262 | 1 | 0 | |
|
Mole Lake County |
1,260 | 4 | 1 | |
|
Barneveld Waterworks Barneveld · Iowa County |
1,258 | 4 | 1 | |
|
Elmbrook Memorial Hospital Brookfield · Waukesha County |
1,250 | 0 | 0 | |
|
Florence Utility Commission Florence · Florence County |
1,250 | 0 | 0 | |
|
McDonalds Vernon Big Bend · Waukesha County |
1,250 | 1 | 1 | |
|
Iola Waterworks Iola · Waupaca County |
1,249 | 0 | 0 | |
|
Frederic Waterworks Frederic · Polk County |
1,241 | 0 | 0 | |
|
Culvers of Newville Edgerton · Rock County |
1,233 | 0 | 0 | |
|
Shullsburg Waterworks Shullsburg · Lafayette County |
1,222 | 0 | 0 | |
|
Monticello Waterworks Monticello · Green County |
1,217 | 2 | 1 | |
|
Lakeland University Plymouth · Sheboygan County |
1,200 | 1 | 0 | |
|
Reedsville Waterworks Reedsville · Manitowoc County |
1,200 | 1 | 1 | |
|
Rockvale MHP Janesville · Rock County |
1,200 | 0 | 0 | |
|
Wilmot Union High School Wilmot · Kenosha County |
1,200 | 1 | 1 | |
|
Wittenberg Waterworks Wittenberg · Shawano County |
1,200 | 0 | 0 | |
|
Hazel Green Waterworks Hazel Green · Grant County |
1,193 | 3 | 1 | |
|
Hilbert Waterworks Hilbert · Calumet County |
1,176 | 0 | 0 | |
|
Princeton Waterworks Princeton · Green Lake County |
1,166 | 2 | 0 | |
|
Neopit County |
1,162 | 0 | 0 | |
|
Luck Waterworks Luck · Polk County |
1,150 | 0 | 0 | |
|
Merton Intermediate & Primary School Merton · Waukesha County |
1,130 | 0 | 0 | |
|
Cashton Waterworks Cashton · Monroe County |
1,120 | 0 | 0 | |
|
Amherst Waterworks Amherst · Portage County |
1,119 | 3 | 1 | |
|
Dane Waterworks Dane · Dane County |
1,117 | 0 | 0 | |
|
WI Dnr Devils Lake North Shore Baraboo · Sauk County |
1,115 | 1 | 0 | |
|
Pleasant Springs Travel Plaza Cottage Grove · Dane County |
1,110 | 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.