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 |
| Five Corners Retail | Mequon, WI | 87 | 0 | - |
| Praise Fellowship Church | Muskego, WI | 87 | 29 | - |
| Goose The | White Lake, WI | 87 | 26 | - |
| Midwest Veterinary Supply | Sun Prairie, WI | 86 | 0 | - |
| Gfl Horicon Hauling | Horicon, WI | 86 | 0 | - |
| Crossroads Presbyterian Church & Preschool | Mequon, WI | 86 | 12 | - |
| Delafield Presbyterian Church | Delafield, WI | 86 | 8 | - |
| Bethlehem Lutheran Church Muskego | Muskego, WI | 86 | 12 | - |
| Nu Roc Health and Rehabilitation Center | Laona, WI | 86 | 33 | - |
| Didion Ethanol | Cambria, WI | 85 | 0 | - |
| Mazomanie MHP | Cedaredge, WI | 85 | 27 | - |
| Noras Bachelors II | Deerfield, WI | 85 | 2 | - |
| Dane Co Lake Farm Co Park Heritage Center | Madison, WI | 85 | 0 | - |
| Trinity Lutheran Church | Hartford, WI | 85 | 8 | - |
| Lkq Smart Parts | Hustisford, WI | 85 | 269 | - |
| Castle Rock Inn | Muscoda, WI | 85 | 8 | - |
| Silver Star | Avoca, WI | 85 | 24 | - |
| Buckhorn Supper Club | Milton, WI | 85 | 5 | - |
| Community Christian School of Baraboo | Baraboo, WI | 85 | 63 | - |
| Rays Mequon LLC | Wauwatosa, WI | 85 | 0 | - |
| Kruepke Trucking Inc | Jackson, WI | 85 | 0 | - |
| Sophias Restaurant | Beloit, WI | 85 | 0 | - |
| Bremer Manufacturing | Elkhart Lake, WI | 85 | 14 | - |
| Albatross Drive IN | Washington Island, WI | 85 | 97 | - |
| Ephraim Moravian Ch | Ephraim, WI | 85 | 91 | - |
| Island Pizza | Wasington Island, WI | 85 | 44 | - |
| Blue Bear Ellison Bay | Ellison Bay, WI | 85 | 77 | - |
| Old School Bar & Grill | Green Lake, WI | 85 | 22 | - |
| American Legion Post 351 | Montello, WI | 85 | 0 | - |
| Rumors Roadhouse | Plymouth, WI | 85 | 17 | - |
| Rolling Meadows of Larsen LLC | La Crosse, WI | 85 | 68 | - |
| Chetek Lanes Inc | Chetek, WI | 85 | 23 | - |
| Christian Harbor Youth Camp Inc-Lodge Well | Eau Claire, WI | 85 | 0 | - |
| Christian Harbor Youth Camp Inc Bathhouse | Eau Claire, WI | 85 | 10 | - |
| Camp Nawakwa Chalet Well | Chippewa Falls, WI | 85 | 3 | - |
| Tainter Woods Condominiums | Colfax, WI | 85 | 104 | - |
| Anthony Acres School | Mondovi, WI | 85 | 48 | - |
| Innsbruck Water Trust | West Salem, WI | 85 | 30 | - |
| Luck Golf Course Shop | Luck, WI | 85 | 0 | - |
| Kids at Play Child Care Center | Stoddard, WI | 85 | 173 | - |
| Trinity Lutheran Ch Ed Bldg | Arkdale, WI | 85 | 1 | - |
| Ponderosa Pines - Bathhouse | Stevens Point, WI | 85 | 8 | - |
| Yukon Trails Cmpgd-West Side Well | Chicago, WI | 85 | 17 | - |
| WI DNR Up Gresham Cmpgd 48 | Boulder Junction, WI | 85 | 5 | - |
| WI DNR Up Gresham Cmpgd 47 | Boulder Junction, WI | 85 | 17 | - |
| WI DNR Up Gresham Lndng 46 | Boulder Junction, WI | 85 | 0 | - |
| Hillside Tavern and Grill | Sayner, WI | 85 | 9 | - |
| Guides Inn | Boulder Jct, WI | 85 | 19 | - |
| Tamarack Health Hayward Medical Center | Hayward, WI | 85 | 167 | - |
| Sinissippi Lake Pub | Hustisford, WI | 84 | 3 | - |