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 |
| Milton KOA RV Resort | Milton, WI | 505 | 2 | - |
| WI DNR Mirror Lake Office/Shop | Baraboo, WI | 505 | 13 | - |
| Holy Trinity Church & Learning Center | Oconomowoc, WI | 505 | 71 | - |
| Burger King Waukesha | Downers Grove, WI | 505 | 4 | - |
| St Edward Sch & Ch | Appleton, WI | 505 | 29 | Clean |
| Linn Presbyterian Church | Lake Geneva, WI | 504 | 31 | - |
| Rstore #4518 | Richmond, WI | 504 | 2 | - |
| Perry Lutheran Church | Mount Horeb, WI | 503 | 14 | - |
| St Joseph San Dist 1 | La Crosse, WI | 503 | 61 | - |
| Missing Links Golf Range | Mequon, WI | 502 | 3 | - |
| Alto Reformed Church | Waupun, WI | 502 | 21 | - |
| Northport Mart | New London, WI | 502 | 0 | - |
| WI DNR Mirror Lake Sandstone Ridge | Baraboo, WI | 501 | 5 | - |
| WI DOT Wayside 17 West Point | Madison, WI | 500 | 6 | - |
| WI DNR Gov Dodge Cox Hollow Picnic | Dodgeville, WI | 500 | 22 | - |
| WI DNR Blue Mound Upper Well | Blue Mounds, WI | 500 | 30 | - |
| Lake Joy Showers and Laundry | Belmont, WI | 500 | 8 | - |
| WI DNR Devils Lake Upper Ice Age Campground | Baraboo, WI | 500 | 27 | - |
| Benson Corners - Preet Petroleum & Pizza Time | Bristol, WI | 500 | 25 | - |
| Fischer Park-West | Sturtevant, WI | 500 | 2 | - |
| Fischer Park-East | Sturtevant, WI | 500 | 0 | - |
| Caseys General Store #3775 | Ankeny, WI | 500 | 0 | - |
| Country Estates Sanitary District Town of Lyons 1 | Burlington, WI | 500 | 380 | - |
| Interlaken Resort and Village | Lake Geneva, WI | 500 | 63 | - |
| Rosewood Dinner Theater | Delavan, WI | 500 | 4 | - |
| Sunburst Ski Area | Kewaskum, WI | 500 | 6 | - |
| Sunburst Snowtubing Area | Kewaskum, WI | 500 | 0 | - |
| Tonawanda Elementary School | Elm Grove, WI | 500 | 21 | - |
| Lake Drive Water Trust | Waukesha, WI | 500 | 17 | - |
| Calumet Co Park Showers | Hilbert, WI | 500 | 8 | - |
| Pioneer Westfield High Sch | Westfield, WI | 500 | 5 | - |
| Waldo Waterworks | Waldo, WI | 500 | 11 | - |
| Hingham Church | Hingham, WI | 500 | 26 | - |
| Pops 202 | Cayce, WI | 500 | 43 | - |
| Lake Holcombe Convenience Store | Chippewa Falls, WI | 500 | 5 | - |
| Eastbay | Eleva, WI | 500 | 0 | - |
| Lake Wissota Golf | Chippewa Falls, WI | 500 | 0 | - |
| Belle Ame Vineyard | River Falls, WI | 500 | 0 | - |
| Sand Valley Golf Resort Hole 11 | Chicago, WI | 500 | 13 | - |
| WI DOT Wayside 2 Orange Camp Douglas | Madison, WI | 500 | 11 | - |
| Three Lakes Sanitary District | Three Lakes, WI | 500 | 33 | - |
| Scouting America Camp Tesomas Program Center and Dining Hall | Weston, WI | 500 | 0 | - |
| Bulls Eye Golf Club | Wisconsin Rapids, WI | 500 | 5 | - |
| St Michaels Catholic Parish | Hewitt, WI | 500 | 4 | - |
| Bay City Waterworks | Bay City, WI | 499 | 29 | - |
| Taylor Waterworks | Taylor, WI | 498 | 122 | - |
| Auburndale High School | Auburndale, WI | 498 | 96 | - |
| Raymond School | Franksville, WI | 497 | 189 | - |
| Holland TN Sanitary Dist | Kaukauna, WI | 495 | 71 | - |
| St Cloud Waterworks | St Cloud, WI | 494 | 24 | - |