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 |
| Alexanders | Fish Creek, WI | 72 | 78 | - |
| Fox Marquette Mobile Home Park | Pardeeville, WI | 72 | 57 | - |
| Pine Drive Cmpgd | Holcombe, WI | 72 | 34 | - |
| Schiltz Properties | Madison, WI | 71 | 72 | - |
| Jcs Wind Lake | Waukesha, WI | 71 | 10 | - |
| Erin Hills Gc - Village Clubhouse & Cottages | Hartford, WI | 71 | 0 | - |
| Ephraim Condominiums | Egg Harbor, WI | 71 | 18 | - |
| Boardwalk Mhc | Irvine, WI | 71 | 205 | - |
| Evergreen Estates | Arbor Vitae, WI | 71 | 22 | - |
| Hoofbeat Ridge Bunk House and Mess Hall | Mazomanie, WI | 70 | 9 | - |
| On the Rox | Sauk City, WI | 70 | 14 | - |
| American Transmission Company | Waukesha, WI | 70 | 23 | - |
| Curtiss Street Bible Fellowship | Mazomanie, WI | 70 | 0 | - |
| Zion Lutheran Church | Ashippun, WI | 70 | 15 | - |
| Horicon Marsh Sportsmens Club, Inc of Mayville | Mayville, WI | 70 | 5 | - |
| WI DNR Wilson State Nursery Shop | Boscobel, WI | 70 | 12 | - |
| Equity Coop Livestock Sales Association | Richland Center, WI | 70 | 20 | - |
| Lucys Hideaway | Milton, WI | 70 | 12 | - |
| Expeditions Unltd Campground | Baraboo, WI | 70 | 10 | - |
| Zion Lutheran Church | Rock Springs, WI | 70 | 5 | - |
| Equinox Rei LLC Dellwood Estates | Minneapolis, WI | 70 | 19 | - |
| Summer Oaks Condo Assoc | Merrimac, WI | 70 | 23 | - |
| Anitas Cafe | Dodgeville, WI | 70 | 10 | - |
| Williamsburg 207 209 and 214 | Milwaukee, WI | 70 | 79 | - |
| Gordie Boucher Ford of Thiensville Inc | Greenfield, WI | 70 | 38 | - |
| Granite Microsystems | Mequon, WI | 70 | 279 | - |
| Eaton Cooper Power Systems | Franksville, WI | 70 | 12 | - |
| Small World Montessori School - Riverside | Racine, WI | 70 | 37 | - |
| Little Red Schoolhouse Colgate | Kewaskum, WI | 70 | 223 | - |
| Bank Five Nine- Brown Street | Oconomowoc, WI | 70 | 0 | - |
| Essential Industries Inc | Merton, WI | 70 | 0 | - |
| Chenequa Country Club Clubhouse | Hartland, WI | 70 | 2 | - |
| Crossing Community Church | Genesee Depot, WI | 70 | 10 | - |
| Sister Bay Moravian Ch | Sister Bay, WI | 70 | 47 | - |
| Northport Ferry Terminal | Wasington Island, WI | 70 | 21 | - |
| Top of the Hill Shops | Egg Harbor, WI | 70 | 35 | - |
| Horseshoe Bay Golf Public | Egg Harbor, WI | 70 | 38 | - |
| WI DNR Kmsfnu Mauthe Lk Upper 500S | Madison, WI | 70 | 0 | - |
| Nortera Foods Camp 194 | Fairwater, WI | 70 | 0 | - |
| Nortera Foods Camp 194 #2-Dining Facility | Fairwater, WI | 70 | 8 | - |
| Green Lake MHP | Cedar Rapids, WI | 70 | 20 | - |
| Shady Oaks Cmpgd Well Near Mgrs Trailer | Markesan, WI | 70 | 0 | - |
| Shady Oaks Cmpgd Well Near Front Gate | Markesan, WI | 70 | 0 | - |
| St Johns Ev Lutheran Ch | Kingston, WI | 70 | 73 | - |
| Wst Fab LLC | Manitowoc, WI | 70 | 0 | - |
| First Presbyterian Ch | Oxford, WI | 70 | 45 | - |
| Sunset Supper Club | Westfield, WI | 70 | 4 | - |
| Building Blocks Childcare Center | Sobieski, WI | 70 | 193 | - |
| Primal Eats LLC | Gillett, WI | 70 | 0 | - |
| Camp Norwid Kitchen | Niles, WI | 70 | 14 | - |