Public Water Systems
654 active public water systems in SD, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
|---|---|---|---|---|
| Sioux Falls | Sioux Falls, SD | 216,462 | 5 | Clean |
| Rapid City | Rapid City, SD | 72,009 | 14 | Detected |
| Aberdeen | Aberdeen, SD | 27,989 | 91 | Detected |
| Brookings Municipal Utilities | Brookings, SD | 23,377 | 12 | Clean |
| Watertown Municipal Utilities | Watertown, SD | 23,230 | 10 | Clean |
| Web Water Development Association | Aberdeen, SD | 20,750 | 8 | Clean |
| Mitchell | Mitchell, SD | 15,651 | 106 | Clean |
| Yankton | Yankton, SD | 15,411 | 91 | Clean |
| Huron | Huron, SD | 14,263 | 11 | Clean |
| Pierre | Pierre, SD | 14,091 | 9 | Clean |
| Box Elder | Box Elder, SD | 14,000 | 330 | Clean |
| Minnehaha Community Water Corp | Dell Rapids, SD | 13,435 | 16 | Clean |
| By Water District | Tabor, SD | 13,320 | 21 | Clean |
| Spearfish | Spearfish, SD | 12,193 | 19 | Clean |
| Mid-Dakota Rural Water | Miller, SD | 11,833 | 3 | Clean |
| Vermillion | Vermillion, SD | 11,695 | 3 | Clean |
| Rapid Valley Sanitary District | Rapid City, SD | 11,408 | 15 | Detected |
| Brandon | Brandon, SD | 11,048 | 43 | Clean |
| Harrisburg | Harrisburg, SD | 10,297 | 14 | Detected |
| Ellsworth Afb | Ellsworth Afb, SD | 9,100 | 17 | Clean |
| Tea | Tea, SD | 7,381 | 24 | Clean |
| Sturgis | Sturgis, SD | 7,020 | 87 | Clean |
| Kingbrook I Rural Water System | Arlington, SD | 6,455 | 9 | Clean |
| Randall Community Water District | Lake Andes, SD | 6,248 | 15 | Clean |
| Brookings-Deuel Rural Water System | Toronto, SD | 6,200 | 9 | Clean |
| Madison | Madison, SD | 6,191 | 86 | Clean |
| Lincoln County Rural Water System | Sioux Falls, SD | 5,965 | 6 | Detected |
| Big Sioux Community Water System | Egan, SD | 5,800 | 6 | Clean |
| Brown-Day-Marshall RWS | Britton, SD | 5,673 | 6 | Clean |
| Belle Fourche | Belle Fourche, SD | 5,617 | 282 | Clean |
| South Lincoln Rural Water System | Beresford, SD | 5,250 | 66 | Clean |
| Grant-Roberts Rural Water System | Milbank, SD | 5,050 | 10 | Clean |
| Tripp County Water User District | Winner, SD | 4,860 | 147 | Clean |
| Clay Rural Water System | Wakonda, SD | 4,780 | 12 | Clean |
| Wr/Lj - Mni Wiconi | Murdo, SD | 4,720 | 2 | Detected |
| Black Hawk Water User District | Black Hawk, SD | 4,500 | 124 | Clean |
| Tm Rural Water District | Parker, SD | 4,250 | 6 | Clean |
| Nps-Mount Rushmore National Memorial | Keystone, SD | 4,100 | 68 | Detected |
| Sioux Rural Water System | Watertown, SD | 4,012 | 13 | Clean |
| Eagle Butte | Eagle Butte, SD | 4,000 | 64 | Clean |
| Dakota Dunes Cid | Dakota Dunes, SD | 3,700 | 3 | - |
| Dell Rapids | Dell Rapids, SD | 3,633 | 13 | Clean |
| Milbank | Milbank, SD | 3,544 | 6 | - |
| Davison Rural Water System Inc | Mitchell, SD | 3,485 | 7 | - |
| Hartford | Hartford, SD | 3,396 | 33 | - |
| Hot Springs | Hot Springs, SD | 3,395 | 8 | Clean |
| Mobridge | Mobridge, SD | 3,261 | 44 | Clean |
| Canton | Canton, SD | 3,066 | 66 | - |
| North Sioux City | North Sioux City, SD | 3,042 | 69 | - |
| Lead | Lead, SD | 2,982 | 10 | - |
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