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 |
| Dane Co Token Creek Campground | Madison, WI | 40 | 0 | - |
| Zwingli United Church of Christ | Belleville, WI | 40 | 4 | - |
| Prairie Creek the Refuge Church | Sun Prairie, WI | 40 | 0 | - |
| Twin Valley Free Will Baptist Ch | Madison, WI | 40 | 0 | - |
| Middleton Town Hall Town Of | Verona, WI | 40 | 4 | - |
| Harris Moran Seed Co | Sun Prairie, WI | 40 | 0 | - |
| Country View Veterinary Clinic | Oregon, WI | 40 | 0 | - |
| Grace Evangelical Church | Madison, WI | 40 | 0 | - |
| Statewide Supply Inc | Cross Plains, WI | 40 | 0 | - |
| Prototek Digital Manufacturing (Madison) LLC | Blue Mounds, WI | 40 | 92 | - |
| Mayville Limestone Inc | Mayville, WI | 40 | 0 | - |
| Marshview Terrace | Stevens Point, WI | 40 | 134 | - |
| St Johns Ev Lutheran Church | Horicon, WI | 40 | 2 | - |
| St Marks Lutheran Church | Ixonia, WI | 40 | 5 | - |
| Sams Well Drilling | Randolph, WI | 40 | 14 | - |
| Potosi Community Bible Church | Potosi, WI | 40 | 0 | - |
| Bluffside Court | Cassville, WI | 40 | 42 | - |
| Gracies Point | Platteville, WI | 40 | 34 | - |
| WI DNR Nelson Dewey Campground | Bagley, WI | 40 | 24 | - |
| Grace Independent Baptist Church | Brodhead, WI | 40 | 10 | - |
| Farmers Implement Store | Mineral Point, WI | 40 | 9 | - |
| American Players Theatre Actors | Spring Green, WI | 40 | 6 | - |
| Zweifels Country View | Dodgeville, WI | 40 | 45 | - |
| Wolfs Mobile Homes | Whitewater, WI | 40 | 111 | - |
| Sullivan Veterans Memorial Park | Sullivan, WI | 40 | 0 | - |
| Farmington Recreational Assoc Park | Helenville, WI | 40 | 5 | - |
| Jefferson Co Humane Society | Jefferson, WI | 40 | 0 | - |
| Alta Genetics | Watertown, WI | 40 | 0 | - |
| Gfl Environmental | Hartland, WI | 40 | 11 | - |
| Hillpoint Hideaway | Hillpoint, WI | 40 | 0 | - |
| US Dairy Forage Research Center | Madison, WI | 40 | 11 | - |
| Double K D Ranch Bud Kd Well | Baraboo, WI | 40 | 7 | - |
| Spring Green Estates South | Marshfield, WI | 40 | 5 | - |
| Birchwood Transport Inc | Kenosha, WI | 40 | 21 | - |
| Twin Lakes Municipal Bldg | Twin Lakes, WI | 40 | 0 | - |
| Heidel RD Apts 139 | Milwaukee, WI | 40 | 131 | - |
| Heidel RD Apts 152 | Milwaukee, WI | 40 | 174 | - |
| Do It Best Hardware | Thiensville, WI | 40 | 5 | - |
| Riteway Bus Service-Cedarburg | Cedarburg, WI | 40 | 18 | - |
| Bog Golf Course Shop | Saukville, WI | 40 | 4 | - |
| Colour Bowl Salon & Wellness The | Thiensville, WI | 40 | 0 | - |
| Caledonia Village Hall | Racine, WI | 40 | 33 | - |
| Browns Lake Condos Well 2 Bldgs C & I | Burlington, WI | 40 | 26 | - |
| Rohner Range | Racine, WI | 40 | 19 | - |
| St George Serbian Orthodox Church | Racine, WI | 40 | 0 | - |
| East Troy S D 3 | East Troy, WI | 40 | 96 | - |
| Wagon Wheel | Delavan, WI | 40 | 26 | - |
| Chapel on the Hill Food Pantry | Lake Geneva, WI | 40 | 9 | - |
| St Lawrence C-Way | Hartford, WI | 40 | 57 | - |
| Traditions Pub | Fredonia, WI | 40 | 22 | - |