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 |
|---|---|---|---|---|
| Sherwood Waterworks | Sherwood, WI | 3,114 | 150 | - |
| Oostburg Waterworks | Oostburg, WI | 3,110 | 13 | - |
| Lake Como Sanitary Dist 1 | Lake Geneva, WI | 3,038 | 97 | - |
| Hortonville Water Utility | Hortonville, WI | 3,028 | 54 | - |
| New Holstein Waterworks | New Holstein, WI | 3,012 | 52 | - |
| Woodside Sports Complex | Mauston, WI | 3,008 | 8 | - |
| WI DOT Rest Area 22 Turtle | Madison, WI | 3,005 | 34 | - |
| WI DOT Rest Area 13 Aztalan | Madison, WI | 3,004 | 72 | - |
| Park Falls Waterworks | Park Falls, WI | 2,993 | 247 | - |
| Amery Waterworks | Amery, WI | 2,962 | 36 | - |
| Lake Delton Waterworks | Lake Delton, WI | 2,914 | 14 | - |
| Oconto Falls Waterworks | Oconto Falls, WI | 2,892 | 21 | - |
| Somerset Waterworks | Somerset, WI | 2,854 | 44 | - |
| Kewaunee Waterworks | Kewaunee, WI | 2,848 | 137 | - |
| Mendota Mental Health Inst | Madison, WI | 2,787 | 17 | - |
| Rome Water Utility | Nekoosa, WI | 2,775 | 10 | - |
| Genoa City Waterworks | Genoa City, WI | 2,766 | 248 | - |
| Luxemburg Waterworks | Luxemburg, WI | 2,737 | 12 | - |
| Belleville Waterworks | Belleville, WI | 2,712 | 12 | - |
| Lomira Waterworks | Lomira, WI | 2,701 | 188 | - |
| Brockway Sanitary Dist 1 | Black River Falls, WI | 2,692 | 31 | - |
| Denmark Waterworks | Denmark, WI | 2,684 | 30 | Clean |
| Osceola Waterworks | Osceola, WI | 2,680 | 57 | - |
| Mondovi Waterworks | Mondovi, WI | 2,667 | 30 | - |
| Spooner Waterworks | Spooner, WI | 2,653 | 79 | - |
| Juneau Waterworks | Juneau, WI | 2,627 | 45 | - |
| Williams Bay Waterworks | Williams Bay, WI | 2,601 | 135 | - |
| Hayward Water Utility | Hayward, WI | 2,552 | 72 | - |
| New Lisbon Waterworks | New Lisbon, WI | 2,526 | 135 | - |
| Poynette Waterworks | Poynette, WI | 2,520 | 74 | - |
| Deerfield Waterworks | Deerfield, WI | 2,510 | 45 | - |
| Fennimore Waterworks | Fennimore, WI | 2,507 | 43 | - |
| WI DOT Rest Area 11 Dekorra East Bound | Madison, WI | 2,505 | 64 | - |
| WI DOT Rest Area 17 Milton | Madison, WI | 2,503 | 23 | - |
| Winneconne Waterworks | Winneconne, WI | 2,502 | 169 | - |
| Abbotsford Waterworks | Abbotsford, WI | 2,502 | 121 | - |
| Belgium Waterworks | Belgium, WI | 2,493 | 54 | - |
| Mineral Point Waterworks | Mineral Point, WI | 2,487 | 93 | - |
| Westby Waterworks | Westby, WI | 2,400 | 13 | - |
| Nekoosa Waterworks | Nekoosa, WI | 2,394 | 25 | - |
| Neillsville Waterworks | Neillsville, WI | 2,384 | 18 | - |
| Lakeland Sanitary Dist 1 | Minocqua, WI | 2,381 | 20 | - |
| Dousman Water Utility | Dousman, WI | 2,350 | 129 | - |
| New Glarus Waterworks | New Glarus, WI | 2,348 | 132 | - |
| Cumberland Waterworks | Cumberland, WI | 2,311 | 43 | - |
| Walworth Waterworks | Walworth, WI | 2,304 | 69 | - |
| Wautoma Water Dept | Wautoma, WI | 2,280 | 49 | - |
| Washburn Waterworks | Washburn, WI | 2,280 | 44 | - |
| Fredonia Waterworks | Fredonia, WI | 2,279 | 35 | - |
| Kohler Waterworks | Kohler, WI | 2,271 | 46 | - |