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 |
|---|---|---|---|---|
| Posen | Posen, IL | 5,331 | 57 | Clean |
| Pike County Pwd 1 | Pittsfield, IL | 5,327 | 31 | Clean |
| Sangamon Valley Pwd | Mahomet, IL | 5,300 | 30 | Clean |
| Genoa | Genoa, IL | 5,298 | 66 | Detected |
| Mitchell Pwd | Granite City, IL | 5,253 | 29 | Detected |
| Flora | Flora, IL | 5,233 | 49 | Clean |
| IL American-Fernway | Godfrey, IL | 5,223 | 27 | Clean |
| Eureka | Eureka, IL | 5,216 | 131 | Clean |
| Berkeley | Berkeley, IL | 5,214 | 50 | Clean |
| Monee | Monee, IL | 5,148 | 265 | Clean |
| Caterpillar Trail Pwd | East Peoria, IL | 5,125 | 20 | Clean |
| Aqua Illinois-Willowbrook | Kankakee, IL | 5,100 | 15 | Clean |
| Marseilles | Marseilles, IL | 5,061 | 158 | Clean |
| Brighton | Brighton, IL | 5,041 | 89 | Detected |
| Niabi Zoo | Coal Valley, IL | 5,000 | 25 | - |
| U of I Chicago Medical Center | Chicago, IL | 5,000 | 190 | Clean |
| Murdale Pwd | Murphysboro, IL | 4,963 | 17 | Clean |
| Milan | Milan, IL | 4,945 | 161 | Clean |
| Creve Coeur | Creve Coeur, IL | 4,934 | 55 | Clean |
| Olympia Fields | Olympia Fields, IL | 4,922 | 47 | Clean |
| Anna | Anna, IL | 4,910 | 72 | Clean |
| Round Lake Park | Round Lake Park, IL | 4,900 | 30 | Clean |
| Tuscola | Tuscola, IL | 4,875 | 41 | Clean |
| Palos Park | Palos Park, IL | 4,873 | 4 | Clean |
| West Prairie Water Company | Arthur, IL | 4,800 | 18 | - |
| Breese | Breese, IL | 4,772 | 54 | Clean |
| Byron | Byron, IL | 4,743 | 423 | Clean |
| Cherry Valley | Cherry Valley, IL | 4,731 | 22 | Clean |
| Sullivan | Sullivan, IL | 4,729 | 31 | Clean |
| Petersburg | Petersburg, IL | 4,725 | 18 | Clean |
| Eldorado | Eldorado, IL | 4,715 | 38 | Clean |
| Lebanon | Lebanon, IL | 4,714 | 46 | Clean |
| Beecher | Beecher, IL | 4,713 | 28 | Clean |
| Freeburg | Freeburg, IL | 4,707 | 62 | Detected |
| Fox River Grove | Fox River Grove, IL | 4,702 | 51 | Detected |
| Pittsfield | Pittsfield, IL | 4,697 | 109 | Clean |
| Dupo | Dupo, IL | 4,684 | 8 | Detected |
| Calhoun County RWD | Hardin, IL | 4,675 | 30 | Clean |
| Stone Park | West Chicago, IL | 4,576 | 30 | Clean |
| Athens | Athens, IL | 4,575 | 120 | Clean |
| Auburn | Auburn, IL | 4,574 | 51 | Clean |
| Lawrenceville | Lawrenceville, IL | 4,524 | 73 | Clean |
| South Highway Pwd | Makanda, IL | 4,501 | 38 | Clean |
| Paxton | Paxton, IL | 4,500 | 7 | Clean |
| Oglesby | Oglesby, IL | 4,500 | 206 | Clean |
| Hillsboro | Hillsboro, IL | 4,402 | 111 | Clean |
| Dwight | Dwight, IL | 4,400 | 40 | Clean |
| Sparta | Sparta, IL | 4,395 | 189 | Clean |
| Riverton | Riverton, IL | 4,279 | 62 | Clean |
| Cortland | Cortland, IL | 4,270 | 199 | Clean |