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 |
|---|---|---|---|---|
| Lake Villa | Lake Villa, IL | 8,829 | 75 | Clean |
| Mascoutah | Mascoutah, IL | 8,759 | 43 | Clean |
| IL American-Jerseyville | Godfrey, IL | 8,737 | 189 | Clean |
| Beach Park | Beach Park, IL | 8,710 | 8 | Clean |
| Clarendon Hills | Clarendon Hills, IL | 8,702 | 14 | Clean |
| West Frankfort | West Frankfort, IL | 8,650 | 62 | Clean |
| Rock Falls | Rock Falls, IL | 8,620 | 142 | Detected |
| Harrisburg | Harrisburg, IL | 8,524 | 39 | Clean |
| Calumet Park | Calumet Park, IL | 8,442 | 51 | Clean |
| Chester | Chester, IL | 8,407 | 113 | Detected |
| Gilberts | Gilberts, IL | 8,366 | 17 | Clean |
| Greenville | Greenville, IL | 8,310 | 96 | Clean |
| Prairie Path Water Co-Whispering Hills | McHenry, IL | 8,300 | 76 | Detected |
| North Tazewell Pwd | East Peoria, IL | 8,300 | 172 | Clean |
| Crete | Crete, IL | 8,275 | 26 | Clean |
| Hillside | Hillside, IL | 8,200 | 24 | Clean |
| Benton | Benton, IL | 8,104 | 85 | Clean |
| Island Lake | Island Lake, IL | 8,066 | 10 | Clean |
| Mill Creek Water Reclamation District | Geneva, IL | 8,000 | 59 | Clean |
| Western Illinois University | Macomb, IL | 8,000 | 68 | Clean |
| Lincolnshire | Lincolnshire, IL | 7,940 | 17 | Clean |
| Fosterburg Pwd | Alton, IL | 7,940 | 25 | Detected |
| Salem | Salem, IL | 7,905 | 30 | Clean |
| IL American-South Beloit | Godfrey, IL | 7,893 | 108 | Detected |
| Long Creek Township PWS | Decatur, IL | 7,850 | 22 | Clean |
| Broadview | Broadview, IL | 7,847 | 34 | Clean |
| West Dundee | West Dundee, IL | 7,845 | 111 | Clean |
| Princeton | Princeton, IL | 7,832 | 32 | Clean |
| Rock Island Arsenal, US Army | Rock Island, IL | 7,800 | 46 | Detected |
| Hampshire | Hampshire, IL | 7,758 | 142 | Clean |
| Rockton | Rockton, IL | 7,685 | 212 | Detected |
| Vandalia | Vandalia, IL | 7,616 | 62 | Clean |
| Marengo | Marengo, IL | 7,572 | 14 | Detected |
| Silvis | Silvis, IL | 7,473 | 278 | Clean |
| Duquoin | Duquoin, IL | 7,169 | 55 | Detected |
| Sandwich | Sandwich, IL | 7,156 | 48 | Clean |
| Clinton | Clinton, IL | 7,128 | 76 | Clean |
| Raccoon Water Company | Centralia, IL | 7,080 | 41 | Clean |
| North Riverside | North Riverside, IL | 7,071 | 29 | Clean |
| Mount Carmel | Mt Carmel, IL | 7,015 | 253 | Detected |
| Aqua Illinois-University Park | Kankakee, IL | 7,002 | 24 | Detected |
| Southeast Regional Water Facility | Darien, IL | 6,940 | 2 | Clean |
| Mendota | Mendota, IL | 6,926 | 171 | Clean |
| Stickney | Stickney, IL | 6,902 | 52 | Clean |
| Abs Water Coop | Clayton, IL | 6,858 | 35 | Clean |
| American Water Oper and Maintenance, LLC | Scott Air Force Base, IL | 6,779 | 49 | Detected |
| IL American-Valley View | Godfrey, IL | 6,721 | 3 | Detected |
| Curran-Gardner Township Pwd | Springfield, IL | 6,651 | 12 | Clean |
| Litchfield | Litchfield, IL | 6,648 | 172 | Clean |
| Bond/Madison Water Company | Pocahontas, IL | 6,645 | 21 | Detected |