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 |
|---|---|---|---|---|
| Otter Lake Water Commission | Virden, IL | 1,318 | 71 | - |
| Barry | Barry, IL | 1,318 | 37 | - |
| Assumption | Assumption, IL | 1,315 | 53 | - |
| Walnut | Walnut, IL | 1,311 | 31 | - |
| Milford | Milford, IL | 1,306 | 83 | - |
| Taylorville Correctional Center | Taylorville, IL | 1,300 | 12 | - |
| Blue Mound | Moweaqua, IL | 1,300 | 159 | - |
| Wyoming | Wyoming, IL | 1,300 | 141 | - |
| Prairie Path Water Company-Lake Wildwood | Oakwood, IL | 1,295 | 12 | - |
| Good Shepherd Hospital | Barrington, IL | 1,290 | 167 | - |
| Countryside Lake Subdivision -Lake Co Pw | Libertyville, IL | 1,287 | 35 | - |
| New Hope Waterworks Corp | Fairfield, IL | 1,285 | 39 | - |
| Toledo | Toledo, IL | 1,278 | 15 | - |
| IL American-Washington Estates | Godfrey, IL | 1,278 | 121 | - |
| Petrolia Pwd | Bridgeport, IL | 1,275 | 36 | - |
| St Elmo | St Elmo, IL | 1,272 | 105 | - |
| Cobden | Cobden, IL | 1,267 | 33 | - |
| Ladd | Ladd, IL | 1,263 | 188 | - |
| Valmeyer | Valmeyer, IL | 1,263 | 62 | Clean |
| Hartford | Hartford, IL | 1,260 | 25 | - |
| Griggsville | Griggsville, IL | 1,259 | 36 | - |
| Chatsworth | Chatsworth, IL | 1,256 | 17 | - |
| Hanna City | Hanna City, IL | 1,253 | 96 | - |
| Lake Williamson Christian Center | Carlinville, IL | 1,250 | 117 | - |
| Prospect Heights Plaza | Prospect Heights, IL | 1,240 | 478 | - |
| Wayne City | Wayne City, IL | 1,239 | 24 | - |
| Blackhawk Estates LLC | Chicago, IL | 1,238 | 152 | - |
| Prairie Path Water Company-Killarney | McHenry, IL | 1,232 | 27 | - |
| Albers | Albers, IL | 1,231 | 76 | - |
| Warrensburg | Warrensburg, IL | 1,230 | 50 | - |
| Forrest | Forrest, IL | 1,225 | 5 | - |
| IL American-Arbury | Godfrey, IL | 1,225 | 157 | - |
| Hillcrest | Rochelle, IL | 1,224 | 225 | - |
| Macon | Macon, IL | 1,205 | 10 | - |
| Louisville | Louisville, IL | 1,201 | 52 | - |
| Downs | Downs, IL | 1,201 | 196 | - |
| Homer | Homer, IL | 1,200 | 43 | - |
| Martinsville | Martinsville, IL | 1,200 | 57 | - |
| Chrisman | Chrisman, IL | 1,200 | 352 | - |
| Laharpe | La Harpe, IL | 1,200 | 161 | - |
| Nauvoo | Nauvoo, IL | 1,200 | 303 | - |
| Aqua Illinois-Skyline (Northern) | Kankakee, IL | 1,200 | 799 | - |
| St Anne | St Anne, IL | 1,200 | 51 | - |
| Stillman Valley | Stillman Valley, IL | 1,200 | 20 | - |
| Windsor | Windsor, IL | 1,200 | 71 | - |
| Park Center of Kemper Lakes Aviands | Long Grove, IL | 1,200 | 294 | - |
| Swedish Covenant Hospital | Chicago, IL | 1,200 | 68 | - |
| Gallatin-White Water District | Norris City, IL | 1,196 | 27 | - |
| South Lawrence Water Corp | Sumner, IL | 1,195 | 12 | - |
| Liberty-Ledford Pwd | Harrisburg, IL | 1,195 | 11 | - |