All water systems in Illinois
5,097 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Curran-Gardner Township Pwd Springfield · Sangamon County |
6,651 | 0 | 0 | |
|
Litchfield Montgomery County |
6,648 | 5 | 1 | |
|
Bond/madison Water Company Bond County |
6,645 | 4 | 0 | |
|
Volo Volo · Lake County |
6,629 | 2 | 0 | |
|
IL American-Dupage Utility DuPage County |
6,613 | 0 | 0 | |
|
Illinois State University-Normal Normal · McLean County |
6,600 | 4 | 0 | |
|
LA Grange Highlands Sanitary District Cook County |
6,600 | 1 | 1 | |
|
Carlinville Carlinville · Macoupin County |
6,598 | 0 | 0 | |
|
Winthrop Harbor Winthrop Harbor · Lake County |
6,565 | 4 | 3 | |
|
Elburn Elburn · Kane County |
6,559 | 0 | 0 | |
|
Geneseo Geneseo · Henry County |
6,539 | 0 | 0 | |
|
Carterville Carterville · Williamson County |
6,528 | 2 | 0 | |
|
Northern Illinois University-Dekalb DeKalb County |
6,500 | 0 | 0 | |
|
Aqua Illinois-Candlewick Dvn Boone County |
6,426 | 1 | 1 | |
|
Countryside Countryside · Cook County |
6,420 | 1 | 0 | |
|
Dallas Rural Water District Dallas City · Henderson County |
6,370 | 2 | 0 | |
|
Fort Massac Pwd Joppa · Massac County |
6,360 | 2 | 0 | |
|
Metropolis Metropolis · Massac County |
6,309 | 1 | 0 | |
|
Carmi Carmi · White County |
6,307 | 0 | 0 | |
|
Northshore University Evanston Cook County |
6,300 | 4 | 1 | |
|
Williamsville Williamsville · Sangamon County |
6,198 | 1 | 0 | |
|
Braidwood Braidwood · Will County |
6,194 | 2 | 0 | |
|
Fairfield Fairfield · Wayne County |
5,998 | 4 | 0 | |
|
Beardstown Beardstown · Cass County |
5,951 | 1 | 0 | |
|
Peoria Heights Peoria Heights · Peoria County |
5,908 | 1 | 0 | |
|
Coal City Coal City · Grundy County |
5,845 | 4 | 2 | |
|
Mount Zion Mount Zion · Macon County |
5,833 | 1 | 0 | |
|
Pinckneyville Pinckneyville · Perry County |
5,804 | 4 | 0 | |
|
Hoopeston Hoopeston · Vermilion County |
5,802 | 0 | 0 | |
|
Pana Pana · Christian County |
5,800 | 0 | 0 | |
|
East Alton East Alton · Madison County |
5,786 | 1 | 1 | |
|
Staunton Staunton · Macoupin County |
5,756 | 4 | 0 | |
|
Mill Creek Pwd Adams County |
5,755 | 1 | 0 | |
|
Grandwood Park Subdivision Lake CO PW Lake County |
5,751 | 0 | 0 | |
|
Northfield Northfield · Cook County |
5,751 | 1 | 1 | |
|
Wilmington Wilmington · Will County |
5,700 | 7 | 0 | |
|
Fayette Water Company Fayette County |
5,608 | 5 | 0 | |
|
Lake Bluff Lake Bluff · Lake County |
5,600 | 2 | 1 | |
|
Shelbyville Shelbyville · Shelby County |
5,600 | 2 | 1 | |
|
Spring Valley Spring Valley · Bureau County |
5,582 | 0 | 0 | |
|
Millstone Pwd Pope County |
5,565 | 5 | 1 | |
|
Monticello Monticello · Piatt County |
5,548 | 0 | 0 | |
|
IL American-Fernway Westhaven · Cook County |
5,521 | 0 | 0 | |
|
Eastern Illinois University Charleston · Coles County |
5,500 | 3 | 0 | |
|
Northeast Mount Vernon Water Company Jefferson County |
5,483 | 0 | 0 | |
|
Park City Park City · Lake County |
5,425 | 3 | 0 | |
|
Robbins Robbins · Cook County |
5,415 | 6 | 3 | |
|
Pike County Pwd 1 Pike County |
5,375 | 0 | 0 | |
|
Aqua Illinois-Oak Brook Oak Brook · DuPage County |
5,361 | 0 | 0 | |
|
Highwood Highwood · Lake County |
5,335 | 1 | 1 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Illinois records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.