Public Water Systems
5,117 active public water systems in IL, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
|---|---|---|---|---|
| Volo | Volo, IL | 6,629 | 136 | Clean |
| IL American-Dupage Utility | Godfrey, IL | 6,613 | 15 | - |
| Prairie Path Water Company-Lake Holiday | St. Charles, IL | 6,601 | 44 | Clean |
| La Grange Highlands Sanitary District | Lagrange, IL | 6,600 | 6 | Clean |
| Illinois State University-Normal | Normal, IL | 6,600 | 100 | Clean |
| Carlinville | Carlinville, IL | 6,598 | 243 | Clean |
| Mahomet | Mahomet, IL | 6,580 | 22 | Clean |
| Winthrop Harbor | Winthrop Harbor, IL | 6,565 | 102 | Clean |
| Elburn | Elburn, IL | 6,559 | 276 | Clean |
| Geneseo | Geneseo, IL | 6,539 | 35 | Detected |
| Northern Illinois University-Dekalb | Dekalb, IL | 6,500 | 36 | Clean |
| Carterville | Carterville, IL | 6,484 | 29 | Detected |
| Aqua Illinois-Candlewick Dvn | Kankakee, IL | 6,426 | 87 | Clean |
| Countryside | Countryside, IL | 6,420 | 22 | Clean |
| Dallas Rural Water District | Hamilton, IL | 6,370 | 23 | Clean |
| Metropolis | Metropolis, IL | 6,309 | 133 | Clean |
| Carmi | Carmi, IL | 6,307 | 31 | Clean |
| Northshore University Evanston | Chicago, IL | 6,300 | 51 | Clean |
| Fort Massac Pwd | Metropolis, IL | 6,290 | 31 | Clean |
| Fairfield | Fairfield, IL | 6,202 | 138 | Clean |
| Williamsville | Williamsville, IL | 6,198 | 8 | Clean |
| Braidwood | Braidwood, IL | 6,194 | 165 | Clean |
| Shelbyville | Shelbyville, IL | 6,174 | 11 | Clean |
| Chillicothe | Chillicothe, IL | 5,996 | 137 | Detected |
| Beardstown | Beardstown, IL | 5,951 | 52 | Clean |
| Peoria Heights | Peoria Heights, IL | 5,908 | 74 | Detected |
| Mount Zion | Mount Zion, IL | 5,833 | 159 | Detected |
| Pinckneyville | Pinckneyville, IL | 5,804 | 169 | Clean |
| Hoopeston | Hoopeston, IL | 5,802 | 13 | Clean |
| Clark-Edgar RWD | Marshall, IL | 5,801 | 6 | Clean |
| Pana | Pana, IL | 5,800 | 320 | Detected |
| East Alton | East Alton, IL | 5,786 | 21 | Detected |
| Staunton | Staunton, IL | 5,756 | 201 | Detected |
| Mill Creek Pwd | Quincy, IL | 5,755 | 15 | Clean |
| Grandwood Park Subdivision - Lake Co Pw | Libertyville, IL | 5,751 | 61 | Clean |
| Coal City | Coal City, IL | 5,749 | 621 | Clean |
| Wilmington | Wilmington, IL | 5,624 | 335 | Detected |
| Fayette Water Company | Brownstown, IL | 5,608 | 129 | Clean |
| Lake Bluff | Lake Bluff, IL | 5,600 | 49 | Clean |
| Spring Valley | Spring Valley, IL | 5,582 | 127 | Clean |
| Millstone Pwd | Nashville, IL | 5,565 | 62 | Clean |
| Monticello | Monticello, IL | 5,548 | 11 | Clean |
| Eastern Illinois University | Charleston, IL | 5,500 | 46 | Clean |
| Watseka | Watseka, IL | 5,500 | 91 | Clean |
| Northeast Mount Vernon Water Company | Mt Vernon, IL | 5,483 | 23 | Detected |
| Northfield | Northfield, IL | 5,470 | 6 | Clean |
| Park City | Park City, IL | 5,425 | 52 | Clean |
| Robbins | Robbins, IL | 5,415 | 258 | Clean |
| Aqua Illinois-Oak Brook | Kankakee, IL | 5,361 | 1 | - |
| Highwood | Highwood, IL | 5,335 | 37 | Clean |