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 |
| WI DNR Kmsfnu Lizard Mound State Park | Madison, WI | 40 | 18 | - |
| Richfield Fire Station 2 & Firemans Park Concession Stand | Hubertus, WI | 40 | 11 | - |
| Evergreens | Pewaukee, WI | 40 | 225 | - |
| North Lake Inn | North Lake, WI | 40 | 4 | - |
| Country Aire Condos 4821 | Pewaukee, WI | 40 | 12 | - |
| Country Aire Condos 4835 | Pewaukee, WI | 40 | 23 | - |
| Country Aire Condos 4887 | Pewaukee, WI | 40 | 2 | - |
| Country Aire Condos 4875 | Pewaukee, WI | 40 | 8 | - |
| Pollworth Park Pavilion | Merton, WI | 40 | 26 | - |
| Delafield Library & City Hall | Delafield, WI | 40 | 0 | - |
| Genesee Lake RD Park | Summit, WI | 40 | 17 | - |
| Natures Classroom Institute Property LLC | Mukwonago, WI | 40 | 193 | - |
| Rogers Mem Hosp - Ladish Co Foundation Center | Oconomowoc, WI | 40 | 0 | - |
| Scotts Industrial Coatings LLC | Green Bay, WI | 40 | 2 | - |
| Lull Abi Inn | Algoma, WI | 40 | 56 | - |
| Middle Bar II LLC | Washington Island, WI | 40 | 109 | - |
| Baywoods Condominiums | Luxemburg, WI | 40 | 100 | - |
| Ephraim Village Admin Bldg Fire Dept | Ephraim, WI | 40 | 111 | - |
| YMCA Camp Wabansi | Green Bay, WI | 40 | 45 | - |
| Villaggios Steak House | Egg Harbor, WI | 40 | 20 | - |
| Eagle Harbor Inn Condos 2 | Ephraim, WI | 40 | 17 | - |
| Scouting America Camp Long Lake 5 Rotary | Waukesha, WI | 40 | 21 | - |
| Johnsburg Athletic Club Inc | Malone, WI | 40 | 2 | - |
| Sportsmans Resort and Bait & Tackle | Marquette, WI | 40 | 5 | - |
| Tucked Away Tavern | Manchester, WI | 40 | 20 | - |
| Shoto Corporation | Two Rivers, WI | 40 | 44 | - |
| Chiara Convent | Manitowoc, WI | 40 | 6 | - |
| Maple Leaf Dairy Inc West | Cleveland, WI | 40 | 86 | - |
| Hilltop Homestead of Crivitz South Pk | Crivitz, WI | 40 | 0 | - |
| Hilltop Resort Motel | Crivitz, WI | 40 | 0 | - |
| Hilltop Homestead of Crivitz North Pk | Crivitz, WI | 40 | 7 | - |
| Sportsmens Tavern Inc | Westfield, WI | 40 | 8 | - |
| End Zone Bar | Coloma, WI | 40 | 29 | - |
| Chateau Tavern | Montello, WI | 40 | 14 | - |
| Umos Camp 047 Montello Cntr | Oshkosh, WI | 40 | 0 | - |
| Nelsons Rustic Resort | Clintonville, WI | 40 | 44 | - |
| WI DNR Kmsfnu Butler Lk | Madison, WI | 40 | 22 | - |
| WI DNR Kmsfnu Parnell Tower | Madison, WI | 40 | 22 | - |
| Hub at Laacks Hall The | Sheboygan Falls, WI | 40 | 4 | - |
| Cars for 15K | Plymouth, WI | 40 | 0 | - |
| Camp Onaway Headquarters | Neenah, WI | 40 | 0 | - |
| Fremont Village Hall | Fremont, WI | 40 | 0 | - |
| Prime Core Inc | Waupaca, WI | 40 | 0 | - |
| Camp Twin Lakes South Shower Bldg | Waupaca, WI | 40 | 29 | - |
| Seneca Foods Berlin Facility | Berlin, WI | 40 | 8 | - |
| Camp Twin Lakes Duwe Lodge | Waupaca, WI | 40 | 16 | - |
| Triangle Farm Cmpgd | Fremont, WI | 40 | 6 | - |
| Waukau Youth Ctr | Waukau, WI | 40 | 23 | - |
| Wsi 8500 Martin Dr | Neenah, WI | 40 | 0 | - |
| Wsi 772 Specialists Ave | Neenah, WI | 40 | 4 | - |