All water systems in Illinois
5,097 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Lakewood Lakewood · McHenry County |
4,267 | 2 | 1 | |
|
Hometown Hometown · Cook County |
4,240 | 2 | 1 | |
|
Georgetown Georgetown · Vermilion County |
4,200 | 2 | 1 | |
|
Paxton Paxton · Ford County |
4,200 | 1 | 0 | |
|
Morrison Morrison · Whiteside County |
4,188 | 2 | 1 | |
|
Aqua Illinois-Peotone Peotone · Will County |
4,182 | 0 | 0 | |
|
New Baden New Baden · Clinton County |
4,178 | 1 | 0 | |
|
Woodhaven Lee County |
4,100 | 2 | 1 | |
|
Lake Sara Area Water Co-Op, Inc. Effingham · Effingham County |
4,071 | 0 | 0 | |
|
Millstadt Millstadt · St. Clair County |
4,071 | 0 | 0 | |
|
Coal Valley Pwd Williamson County |
4,023 | 1 | 0 | |
|
Wasco SD Kane County |
4,000 | 0 | 0 | |
|
Woodsmoke Ranch LaSalle County |
4,000 | 1 | 1 | |
|
Burnham Burnham · Cook County |
3,989 | 7 | 3 | |
|
North East Central Pwd Madison County |
3,975 | 0 | 0 | |
|
Hamilton County Water District Hamilton County |
3,958 | 0 | 0 | |
|
Rosemont Rosemont · Cook County |
3,952 | 0 | 0 | |
|
Marshall Marshall · Clark County |
3,947 | 1 | 1 | |
|
Corinth Pwd Williamson County |
3,927 | 2 | 1 | |
|
South Chicago Heights South Chicago Heights · Cook County |
3,924 | 1 | 0 | |
|
Saline Valley Conservancy District Eldorado · Saline County |
3,921 | 2 | 0 | |
|
Westville Westville · Vermilion County |
3,917 | 0 | 0 | |
|
Metamora Metamora · Woodford County |
3,895 | 0 | 0 | |
|
Coal Valley Coal Valley · Rock Island County |
3,873 | 3 | 0 | |
|
Wonder Lake McHenry County |
3,870 | 2 | 0 | |
|
Rochester Rochester · Sangamon County |
3,856 | 1 | 0 | |
|
Red Bud Red Bud · Randolph County |
3,804 | 1 | 0 | |
|
Greene County Rwd Greene County |
3,786 | 3 | 0 | |
|
Byron Byron · Ogle County |
3,784 | 1 | 0 | |
|
Pleasant Valley Pwd Peoria County |
3,783 | 2 | 0 | |
|
Embarras Area Water District Coles County |
3,750 | 0 | 0 | |
|
Gillespie Macoupin County |
3,737 | 8 | 3 | |
|
Lcpw Pekara Subdivision Lake County |
3,711 | 0 | 0 | |
|
Rend Lake Inter-City Water System Franklin County |
3,650 | 4 | 0 | |
|
Fairbury Fairbury · Livingston County |
3,633 | 1 | 0 | |
|
Riverwoods Riverwoods · Lake County |
3,618 | 1 | 0 | |
|
IL American-Tolono Tolono · Champaign County |
3,604 | 0 | 0 | |
|
Woodlawn Woodlawn · Jefferson County |
3,587 | 0 | 0 | |
|
Three County Pwd Madison County |
3,575 | 2 | 0 | |
|
Hainesville Hainesville · Lake County |
3,528 | 1 | 0 | |
|
Johnston City Johnston City · Williamson County |
3,509 | 4 | 0 | |
|
South Jacksonville South Jacksonville · Morgan County |
3,501 | 4 | 0 | |
|
Gibson City Gibson City · Ford County |
3,500 | 1 | 0 | |
|
LE Roy Le Roy · McLean County |
3,498 | 4 | 2 | |
|
Forsyth Forsyth · Macon County |
3,490 | 0 | 0 | |
|
Aledo Aledo · Mercer County |
3,470 | 0 | 0 | |
|
Tritownship Water District Highland · Madison County |
3,470 | 2 | 0 | |
|
Oregon Oregon · Ogle County |
3,449 | 4 | 1 | |
|
Hardinville Water Company Robinson · Crawford County |
3,403 | 0 | 0 | |
|
Lutheran General Hospital Cook County |
3,400 | 6 | 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.