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 |
| Fort McCoy Range 36 | Fort McCoy, WI | 25 | 4 | - |
| Tunnel Trail Cmpgd | Beaver Dam, WI | 25 | 8 | - |
| Thrune Visitors Center | Coon Valley, WI | 25 | 9 | - |
| Tomah Pentacostal Assembly | Tomah, WI | 25 | 0 | - |
| Deer Run Cmpgrnd | Warrens, WI | 25 | 6 | - |
| Leon Community Center | Sparta, WI | 25 | 12 | - |
| Cataract Essential Services (Ces) | Sparta, WI | 25 | 53 | - |
| St Marys Ridge Church | Cashton, WI | 25 | 51 | - |
| Restwell Inn LLC | Tomah, WI | 25 | 3 | - |
| Dark Horse | La Crosse, WI | 25 | 37 | - |
| Equity Co-Op Sales Barn | Sparta, WI | 25 | 24 | - |
| WI DNR Elroy Sparta Bike Trail - Sparta Campground East 2 | Madison, WI | 25 | 17 | - |
| Fort McCoy Airfield | Fort McCoy, WI | 25 | 4 | - |
| Holiday Lodge Resort | Warrens, WI | 25 | 0 | - |
| Alchemy Brew Pub | Sparta, WI | 25 | 75 | - |
| Leon Valley Campground Store | Sparta, WI | 25 | 16 | - |
| Skogdalen Lutheran Church | Westby, WI | 25 | 11 | - |
| Warrens Jellystone | Warren, WI | 25 | 12 | - |
| Eagles Club | Sparta, WI | 25 | 101 | - |
| Smart Sand Inc - West Office Well | Yardley, WI | 25 | 4 | - |
| Sparta First Church of the Nazarene | Sparta, WI | 25 | 0 | - |
| Leon Valley Campground Well House | Sparta, WI | 25 | 0 | - |
| Dorset Valley Schoolhouse Restaurant | Wilton, WI | 25 | 0 | - |
| Cataract Mart | Sparta, WI | 25 | 5 | - |
| Oasis Church | Tomah, WI | 25 | 0 | - |
| Fort McCoy Cactf | Fort McCoy, WI | 25 | 8 | - |
| Justin Trails B & B Resort 1 | Sparta, WI | 25 | 0 | - |
| Justin Trails B & B Resort 2 | Sparta, WI | 25 | 0 | - |
| Church of the Nazarene | Tomah, WI | 25 | 0 | - |
| Lake Pepin Cmpgd | Pepin, WI | 25 | 8 | - |
| Alcivia Durand Agronomy | Cottage Grove, WI | 25 | 0 | - |
| Durand Rod & Gun Club | Durand, WI | 25 | 0 | - |
| Trenton Island Yacht Club | Ellsworth, WI | 25 | 11 | - |
| Bible Center Church | Maiden Rock, WI | 25 | 0 | - |
| Ono United Methodist Church | Plum City, WI | 25 | 22 | - |
| Ellsworth Country Club | Ellsworth, WI | 25 | 5 | - |
| WI DNR Kinnickinnic Pk Office | Madison, WI | 25 | 43 | - |
| Sixty Three Express Hager City LLC | Ellsworth, WI | 25 | 9 | - |
| Rock Elm United Methodist Church | Elmwood, WI | 25 | 0 | - |
| Unitarian Universalist Society | River Falls, WI | 25 | 0 | - |
| St Johns United Church of Christ | Prescott, WI | 25 | 0 | - |
| Immanuel Lutheran Church | Maiden Rock, WI | 25 | 0 | - |
| Evangelical Free Church | Plum City, WI | 25 | 0 | - |
| Clydes Corner | Beldenville, WI | 25 | 0 | - |
| Mollys on Main | Arkansaw, WI | 25 | 1 | - |
| Young Acres LLC | Prescott, WI | 25 | 0 | - |
| Gilman Lutheran Church | Spring Valley, WI | 25 | 3 | - |
| American Legion Park - Park RD | Plum City, WI | 25 | 14 | - |
| Vieths Bar | Ellsworth, WI | 25 | 16 | - |
| Waverlys Full Throttle Saloon | Elmwood, WI | 25 | 6 | - |