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 |
| Mequon Colony Estates | Mequon, WI | 75 | 53 | - |
| Alberta Subdivision | Thiensville, WI | 75 | 30 | - |
| Linden Lane Apts 141 | Milwaukee, WI | 75 | 275 | - |
| Little Red School House | Kewaskum, WI | 75 | 445 | - |
| Range Line Inn | Mequon, WI | 75 | 19 | - |
| WI DNR Harrington Beach Welcome Center & North Picnic | Madison, WI | 75 | 64 | - |
| WI DNR Harrington Beach Quarry Lake | Madison, WI | 75 | 94 | - |
| Mequon Retail II LLC | Whitefish Bay, WI | 75 | 13 | - |
| Lions Den Gorge Co Park | Port Washington, WI | 75 | 0 | - |
| Raymond Christian Fellowship | Franksville, WI | 75 | 53 | - |
| Case Eagle Park | Sturtevant, WI | 75 | 0 | - |
| Uncle Bucks | Bristol, WI | 75 | 47 | - |
| Lake Beulah Golf Club | Mukwonago, WI | 75 | 15 | - |
| Booth Lake Memorial Park - Lower & Upper Pavilion | East Troy, WI | 75 | 19 | - |
| River Jacks Bar & Grill | Elkhorn, WI | 75 | 27 | - |
| Lucky Shotz | Hartford, WI | 75 | 10 | - |
| West Bend Country Club | West Bend, WI | 75 | 0 | - |
| Elm Grove Terrace | Mequon, WI | 75 | 28 | - |
| Nagawaukee Park Picnic Area 5 | Waukesha, WI | 75 | 26 | - |
| Techniplas US LLC Plant 2 | Nashotah, WI | 75 | 91 | - |
| Techniplas US LLC Warehouse | Nashotah, WI | 75 | 22 | - |
| Apartments of Stoneridge | Pewaukee, WI | 75 | 71 | - |
| Phantom Lake YMCA Camp Welcome Center. | Mukwonago, WI | 75 | 0 | - |
| WI DNR Harrington Beach Visitor Center | Madison, WI | 75 | 51 | - |
| S & L Motors | Pulaski, WI | 75 | 0 | - |
| Ephraim Shores Motel | Ephraim, WI | 75 | 42 | - |
| Ashs | Florence, WI | 75 | 0 | - |
| WI DNR Kmsfnu Mauthe Lk Shower | Madison, WI | 75 | 1 | - |
| Francis J Simon Field | Eldorado, WI | 75 | 8 | - |
| Eden Village Park - Grahl Ave. | Eden, WI | 75 | 0 | - |
| Rosendale Dairy LLC South Parlor | Kaukauna, WI | 75 | 2 | - |
| Toms Quality Millwork and Hardwoods Inc | Campbellsport, WI | 75 | 13 | - |
| Advocap Inc Headstart | Fond Du Lac, WI | 75 | 23 | - |
| Green Lake Cmpgd Store | Green Lake, WI | 75 | 15 | - |
| Branch Station | Whitelaw, WI | 75 | 4 | - |
| Northland Mission | Dunbar, WI | 75 | 329 | - |
| Oxford Food & Fuel Pantry | Sun Prairie, WI | 75 | 9 | - |
| First Presbyterian Ch | Westfield, WI | 75 | 12 | - |
| Allen Estates LLC | Oak Creek, WI | 75 | 14 | - |
| Fox Cities Builders | Seymour, WI | 75 | 4 | - |
| New Hope United Methodist Church | Greenbush, WI | 75 | 26 | - |
| Mt Morris Camp Sandhill Bldg | Wautoma, WI | 75 | 0 | - |
| Seneca Foods Berlin Migrant Camp 223 | Berlin, WI | 75 | 13 | - |
| Pick N Save | Milwaukee, WI | 75 | 9 | - |
| Cumberland Golf Club | Cumberland, WI | 75 | 0 | - |
| Gosnells Packer Inn | Prairie Farm, WI | 75 | 0 | - |
| Nelson Cheese Factory the Original | Nelson, WI | 75 | 0 | - |
| WI DNR Merrick Entrance Station | Madison, WI | 75 | 56 | - |
| Township 23 Distillery | Nelson, WI | 75 | 0 | - |
| Chippewa Co Round Lake Park | Chippewa Falls, WI | 75 | 0 | - |