Public Water Systems
10,988 active public water systems in WI, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
| Hearts & Hands Inc of Mt Horeb | Mount Horeb, WI | 128 | 58 | - |
| Wingin It | Helenville, WI | 128 | 8 | - |
| Hitters Baseball Academy | Caledonia, WI | 128 | 0 | - |
| Peninsula Players | Fish Creek, WI | 128 | 46 | - |
| Best Western - Wittenberg | Wittenburg, WI | 128 | 8 | - |
| Marsh Inn | Mayville, WI | 127 | 8 | - |
| G & V Machine Co Inc | Ixonia, WI | 127 | 7 | - |
| Christian Life Church | Delavan, WI | 127 | 53 | - |
| Kettle Moraine YMCA - Holy Trinity Congregation | Newburg, WI | 127 | 22 | - |
| St Marys of the Lake Ch | Egg Harbor, WI | 127 | 25 | - |
| Bobbys Gas & Food Mart | Fond Du Lac, WI | 127 | 14 | - |
| C3 Church | Ellsworth, WI | 127 | 265 | - |
| Inspire Early Childhood Addition | Waunakee, WI | 126 | 0 | - |
| St Lukes Lutheran Church | Sullivan, WI | 126 | 15 | - |
| St Johns Lutheran Church | Oconomowoc, WI | 126 | 6 | - |
| St Martin's Catholic Chu | Campbellsport, WI | 126 | 13 | - |
| Hoffmanns Wissota Court | Chippewa Falls, WI | 126 | 30 | - |
| YMCA Camp Pepin - Dining Hall | Red Wing, WI | 126 | 4 | - |
| Kingdom Hall of Jehovahs Witnesses | Poynette, WI | 125 | 5 | - |
| Applewood Hill | Madison, WI | 125 | 14 | - |
| Maple Grove MHP | Beaver Dam, WI | 125 | 260 | - |
| WI DNR Nelson Dewey Walnut Grove Group Camp | Bagley, WI | 125 | 14 | - |
| St Lawrence Cath Parish Center | Jefferson, WI | 125 | 0 | - |
| Black Frog Grill LLC | Sullivan, WI | 125 | 9 | - |
| Natures Villa | Helenville, WI | 125 | 11 | - |
| WI DNR Rocky Arbor a Building | Baraboo, WI | 125 | 0 | - |
| Culvers Restaurant | Spring Green, WI | 125 | 5 | - |
| Kingdom Hall of Jehovahs Witnesses | Baraboo, WI | 125 | 7 | - |
| Eagle Chateau Apts | Mt Pleasant, WI | 125 | 164 | - |
| New Life Lutheran Church | Kenosha, WI | 125 | 25 | - |
| Prairie Apts 3 & 4 | Kenosha, WI | 125 | 143 | - |
| Lakewood Village Apts | Kenosha, WI | 125 | 128 | - |
| Homestead Hs Pavilion | Mequon, WI | 125 | 386 | - |
| Pathway Church | Burlington, WI | 125 | 25 | - |
| Echo Lake Foods Yorkville | Franksville, WI | 125 | 99 | - |
| Coachmans Terrace MHP | Farmington Hills, WI | 125 | 71 | - |
| Mars Restaurant & Resort | Lake Geneva, WI | 125 | 38 | - |
| Lake Geneva Country Club Clubhouse | Fontana, WI | 125 | 53 | - |
| Camp Alice Chester Shower House 10 | West Bend, WI | 125 | 12 | - |
| Hartford - Town - Concession Stand Restrooms | Hartford, WI | 125 | 3 | - |
| Camp Whitcomb Stiemke Lodge | Hartland, WI | 125 | 2 | - |
| Camp Whitcomb Friendship Lodge | Hartland, WI | 125 | 2 | - |
| WI DNR Kmsf Lapham Peak Evergreen Shelter | Madison, WI | 125 | 19 | - |
| WI DNR Pot Shower Bldg | Madison, WI | 125 | 19 | - |
| St Johns Lutheran Sch | Manitowoc, WI | 125 | 43 | - |
| Hoefts Resort & Campground Tavern Well | Cascade, WI | 125 | 0 | - |
| Countryside Christian Church | Pickett, WI | 125 | 0 | - |
| Gilmanton Elementary School | Gilmanton, WI | 125 | 13 | - |
| Gilmanton Middle/High School | Gilmanton, WI | 125 | 51 | - |
| WI DNR Mill Bluff Beach | Ontario, WI | 125 | 51 | - |