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 |
| St Andrew Lutheran Church | West Bend, WI | 259 | 0 | - |
| St Martin of Tours Cong | Franklin, WI | 258 | 299 | - |
| Camp Jcc Pool & Lodge | Fredonia, WI | 258 | 8 | - |
| Little Dumplings Early Learning Center | Oconomowoc, WI | 258 | 0 | - |
| North Shore Chophouse | Edgerton, WI | 257 | 4 | - |
| Immanuel Lutheran Church | Watertown, WI | 256 | 16 | - |
| Browntown Waterworks | Browntown, WI | 256 | 131 | - |
| Yogi Bears Jellystone Park #1 Comfort Station | Wisconsin Dells, WI | 256 | 3 | - |
| Yogi Bears Jellystone Park #2 Comfort Station | Wisconsin Dells, WI | 256 | 7 | - |
| Yogi Bears Jellystone Park #3 Comfort Station | Wisconsin Dells, WI | 256 | 16 | - |
| WI Dells KOA Campground Lower Well | Casper, WI | 255 | 2 | - |
| WI Dells KOA Campground Upper Well | Casper, WI | 255 | 0 | - |
| WI DNR Devils Lake South Shore Shelter | Baraboo, WI | 255 | 15 | - |
| Hidden Glen Golf Course Clubhouse | Cedarburg, WI | 255 | 108 | - |
| Gieses Country Market | Van Dyne, WI | 255 | 13 | - |
| Rio Lobo LLC | Weyauwega, WI | 255 | 0 | - |
| Maine Elementary School | Wausau, WI | 255 | 506 | - |
| WI DNR Wyalusing Visitors Station | Bagley, WI | 254 | 33 | - |
| Newville Travel Centersubway | Edgerton, WI | 254 | 18 | - |
| St Lawrence Church | Hartford, WI | 254 | 217 | - |
| Red Cabin at Green Acres | Fond Du Lac, WI | 254 | 24 | - |
| Stoney Acres | Athens, WI | 254 | 0 | - |
| Ironton Waterworks | Lavalle, WI | 253 | 135 | - |
| Cornerstone Church | Grafton, WI | 253 | 0 | - |
| Eden Elementary School | Campbellsport, WI | 253 | 11 | - |
| Our Lady of the Lakes-St Nicholas Chapel | Random Lake, WI | 253 | 29 | - |
| Antigo Bass Lake Country Club | Deerbrook, WI | 253 | 45 | - |
| Bethlehem Lutheran Church | Portage, WI | 252 | 0 | - |
| St Johns Catholic Church & Parsonage | Rubicon, WI | 252 | 7 | - |
| Stags Tavern | Germantown, WI | 252 | 18 | - |
| Country Inn | Berlin, WI | 252 | 14 | - |
| Washington Reformation Ucc | Monticello, WI | 251 | 0 | - |
| Wayside Tavern | Jefferson, WI | 251 | 18 | - |
| Nashotah Park | Waukesha, WI | 251 | 44 | - |
| Lake Wisconsin Country Club | Prairie Du Sac, WI | 250 | 5 | - |
| Yahara Hills NE Lower Shelter | Madison, WI | 250 | 0 | - |
| Yahara Hills SW Upper Shelter | Madison, WI | 250 | 0 | - |
| McKay Center | Madison, WI | 250 | 5 | - |
| WI DNR Gov Dodge Cox Hollow Open Camp | Dodgeville, WI | 250 | 73 | - |
| WI DNR Blue Mound Lower Well | Blue Mounds, WI | 250 | 23 | - |
| WI DNR Blue Mound Fobm Shelter | Blue Mounds, WI | 250 | 13 | - |
| Bark River Campground - Main Building System | Jefferson, WI | 250 | 2 | - |
| WI DNR Glacial Drumlin Trail Sullivan Rst AR | Delafield, WI | 250 | 107 | - |
| Ste Well 1 | Beloit, WI | 250 | 4 | - |
| Chapparal RV Resort LLC | Hayward, WI | 250 | 0 | - |
| Trinity Ev Lutheran School & Church - Freistadt | Mequon, WI | 250 | 86 | - |
| Riversite | Mequon, WI | 250 | 26 | - |
| Reuter Pavilion | Mequon, WI | 250 | 6 | - |
| Eagle Lake Manor | Kansasville, WI | 250 | 75 | - |
| YMCA Camp Maclean Lodge | Burlington, WI | 250 | 7 | - |