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 |
|---|---|---|---|---|
| Waverly | Waverly, IL | 1,194 | 174 | - |
| IL American-Glasford | Godfrey, IL | 1,193 | 602 | - |
| Toulon | Toulon, IL | 1,193 | 428 | - |
| Camp Point | Camp Point, IL | 1,190 | 45 | - |
| Dowell | Dowell, IL | 1,188 | 18 | - |
| Ferges Water District | Marion, IL | 1,185 | 15 | - |
| Cuba | Cuba, IL | 1,184 | 122 | - |
| IL American-Andalusia | Godfrey, IL | 1,184 | 22 | Clean |
| Danvers | Danvers, IL | 1,183 | 502 | - |
| Valier | Valier, IL | 1,182 | 32 | - |
| Walnut Hill | Centralia, IL | 1,180 | 8 | - |
| Minier | Minier, IL | 1,180 | 11 | - |
| South Barrington | Geneva, IL | 1,175 | 1 | - |
| Divernon | Divernon, IL | 1,172 | 50 | - |
| Mechanicsburg-Buffalo Water Commission | Buffalo, IL | 1,170 | 80 | - |
| Kingston | Kingston, IL | 1,160 | 75 | - |
| Atwood | Atwood, IL | 1,155 | 44 | - |
| Malta | Malta, IL | 1,143 | 44 | - |
| Gorham | Gorham, IL | 1,143 | 39 | - |
| Prospect Water District | Harrisburg, IL | 1,140 | 21 | - |
| Mounds | Mounds, IL | 1,135 | 133 | - |
| Prairie Path Water Company-Ferson Creek | St. Charles, IL | 1,134 | 25 | - |
| Oquawka | Oquawka, IL | 1,125 | 17 | - |
| Johnsburg No.2 | Johnsburg, IL | 1,124 | 157 | - |
| Royalton | Royalton, IL | 1,118 | 88 | - |
| Percy | Percy, IL | 1,111 | 112 | - |
| Flanagan | Flanagan, IL | 1,110 | 24 | - |
| Oraville Water District | Ava, IL | 1,108 | 7 | - |
| IL American-Valley Marina | Godfrey, IL | 1,102 | 7 | - |
| Woodlawn Middle/Country Meadow Elem | Buffalo Grove, IL | 1,100 | 8 | - |
| Worden | Worden, IL | 1,096 | 25 | - |
| Heartville Pwd | Dieterich, IL | 1,092 | 25 | - |
| Crossville | Crossville, IL | 1,091 | 11 | - |
| Hamel | Hamel, IL | 1,087 | 52 | - |
| Robinson Correctional Center | Dieterich, IL | 1,085 | 2 | - |
| Irvington | Centralia, IL | 1,081 | 15 | - |
| Meredosia | Meredosia, IL | 1,075 | 22 | - |
| Edinburg | Edinburg, IL | 1,068 | 79 | - |
| Morrisonville | Morrisonville, IL | 1,068 | 9 | - |
| Elkville | Elkville, IL | 1,068 | 33 | - |
| Goreville | Goreville, IL | 1,068 | 32 | - |
| Thomasboro | Thomasboro, IL | 1,066 | 40 | - |
| Highway 37 North Pwd | Marion, IL | 1,065 | 34 | - |
| Prairie Path Water Company-Harbor Ridge | McHenry, IL | 1,064 | 14 | - |
| Enfield | Enfield, IL | 1,064 | 75 | - |
| Shawneetown | Shawneetown, IL | 1,054 | 30 | - |
| Ava | Ava, IL | 1,053 | 40 | - |
| Coulterville | Coulterville, IL | 1,052 | 55 | - |
| Suburban Apartments (de Kalb Univ Dvl) | Oak Brook, IL | 1,050 | 109 | - |
| Prairie Grove School | Crystal Lake, IL | 1,050 | 147 | - |