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 |
| Sheldon Northwoods Country Store | Sheldon, WI | 77 | 4 | - |
| Bedrock Church | Rio, WI | 76 | 8 | - |
| Peace Through Christ Lutheran Church | Middleton, WI | 76 | 0 | - |
| Lebanon Firemens Park | Lebanon, WI | 76 | 0 | - |
| Dew Drop Inn | Bagley, WI | 76 | 35 | - |
| Bethel Horizons - Adamah | Dodgeville, WI | 76 | 0 | - |
| North Shore Winchester Gun Club | Franksville, WI | 76 | 17 | - |
| K & S Manufacturing Bldg 1 | Ixonia, WI | 76 | 30 | - |
| Eastbay Cmpgd | Eleva, WI | 76 | 0 | - |
| Hunky Dory Resort | Balsam Lake, WI | 76 | 68 | - |
| Rivers Eatery at Ideal Market | Cable, WI | 76 | 5 | - |
| Dane Co Lake Farm Park Group Camp | Madison, WI | 75 | 36 | - |
| Primrose Lutheran Church | Belleville, WI | 75 | 18 | - |
| St Pauls Educational Center | Deerfield, WI | 75 | 48 | - |
| Vermont Lutheran Church | Black Earth, WI | 75 | 0 | - |
| Rockdale Lutheran Church | Cambridge, WI | 75 | 26 | - |
| Springfield Corner Inn | Deforest, WI | 75 | 9 | - |
| Lake Farm Co Park Shelter 1 | Madison, WI | 75 | 0 | - |
| Lake Farm Co Park Boat Launch | Madison, WI | 75 | 5 | - |
| Lake Farm Co Park Shelter 3 | Madison, WI | 75 | 5 | - |
| Lake Farm Co Park Shelter 2 | Madison, WI | 75 | 0 | - |
| Ashippun Sportsmens Club | Ashippun, WI | 75 | 10 | - |
| Waupun Equipment Co Inc | Waupun, WI | 75 | 106 | - |
| Mayville City Ziegler Park | Mayville, WI | 75 | 5 | - |
| Kingdom Hall of Jehovahs Witnesses | Beaver Dam, WI | 75 | 0 | - |
| WI DNR Wyalusing Indoor Group Camp | Bagley, WI | 75 | 12 | - |
| Big H Campground | Cassville, WI | 75 | 0 | - |
| Biddick Inc | Livingston, WI | 75 | 0 | - |
| Happy Hooves LLC | Cassville, WI | 75 | 0 | - |
| St Mary Help of Christians | Sullivan, WI | 75 | 3 | - |
| Firemens Park | Sullivan, WI | 75 | 2 | - |
| WI DNR Sandhill Station Cmpgrd New | Madison, WI | 75 | 12 | - |
| Zion Ev Lutheran Church | Evansville, WI | 75 | 22 | - |
| Cooksville Lutheran Church | Evansville, WI | 75 | 17 | - |
| Carver Roehl North | Janesville, WI | 75 | 44 | - |
| Magnolia Bluff 2 Bottom | Janesville, WI | 75 | 16 | - |
| Kingdom Hall of Jehovahs Witnesses | Beloit, WI | 75 | 12 | - |
| Town of Rock Community Park | Afton, WI | 75 | 30 | - |
| Lower Dells Mhc | Boca Raton, WI | 75 | 35 | - |
| Sauk Co White Mound Park Campground | Hillpoint, WI | 75 | 4 | - |
| Hartje Lumber | La Valle, WI | 75 | 43 | - |
| Glacier View Subdivision | Baraboo, WI | 75 | 444 | - |
| WI DNR Richard Bong Beach Bubbler | Madison, WI | 75 | 25 | - |
| Silver Lake Marina | Forest Park, WI | 75 | 24 | - |
| Conservation Club of Kenosha County | Bristol, WI | 75 | 2 | - |
| Village View Pup | Twin Lakes, WI | 75 | 21 | - |
| St John the Baptist Church & Providence Cath School | Kansasville, WI | 75 | 22 | - |
| Conservation Club of Kenosha County Shotgun Range | Bristol, WI | 75 | 0 | - |
| Whitnall Park Lutheran Church | Hales Corners, WI | 75 | 37 | - |
| Falk Park Well | Oak Creek, WI | 75 | 2 | - |