Water Systems
| Water System | Service Area | People Served | Contaminants detected |
|---|---|---|---|
CH Chicago | Cook County, IL | 2,700,000 | 26 |
AU Aurora | Aurora, IL | 200,000 | 34 |
NA Naperville | Naperville, IL | 155,156 | 21 |
JO Joliet | Joliet, IL | 148,693 | 16 |
RO Rockford | Rockford, IL | 147,051 | 40 |
IL Il American-Champaign | Champaign, IL | 142,250 | 19 |
IL Il American-East St Louis | East St Louis, IL | 139,879 | 34 |
IL Il American-Peoria | Peoria, IL | 121,478 | 37 |
SP Springfield | Springfield, IL | 117,428 | 31 |
EL Elgin | Elgin, IL | 113,911 | 34 |