All water systems in Illinois
5,097 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
North Morgan Water Coop Morgan County |
2,763 | 0 | 0 | |
|
Hamilton Hamilton · Hancock County |
2,753 | 0 | 0 | |
|
Trenton Trenton · Clinton County |
2,742 | 1 | 1 | |
|
Lakemoor Lakemoor · Lake County |
2,720 | 3 | 1 | |
|
Pawnee Pawnee · Sangamon County |
2,700 | 0 | 0 | |
|
Lena Lena · Stephenson County |
2,680 | 1 | 1 | |
|
Colona West Green Rock · Henry County |
2,640 | 0 | 0 | |
|
Fox Lake Hills Subdivision Lake CO PW Lake County |
2,628 | 1 | 0 | |
|
Round Lake Heights Round Lake Heights · Lake County |
2,622 | 0 | 0 | |
|
Altamont Altamont · Effingham County |
2,610 | 1 | 0 | |
|
Moultrie County Rwd Moultrie County |
2,600 | 0 | 0 | |
|
Bridgeport Bridgeport · Lawrence County |
2,572 | 4 | 0 | |
|
Saddlebrook Farms Lake County |
2,558 | 1 | 1 | |
|
Sesser Sesser · Franklin County |
2,556 | 1 | 0 | |
|
Aviston Aviston · Clinton County |
2,545 | 0 | 0 | |
|
Egyptian Water Company Randolph County |
2,543 | 2 | 0 | |
|
Odin Odin · Marion County |
2,543 | 0 | 0 | |
|
Greenwood-Creek Nation Water Company Franklin County |
2,530 | 0 | 0 | |
|
Kenilworth Kenilworth · Cook County |
2,514 | 1 | 0 | |
|
Carrollton Carrollton · Greene County |
2,513 | 2 | 1 | |
|
Carthage Hancock County |
2,510 | 1 | 0 | |
|
Diamond Diamond · Grundy County |
2,508 | 0 | 0 | |
|
Colona East Colona · Henry County |
2,501 | 0 | 0 | |
|
Amboy Amboy · Lee County |
2,500 | 0 | 0 | |
|
Baxter Health Care/hanline Lake County |
2,500 | 3 | 0 | |
|
Coal City Area Club Grundy County |
2,500 | 1 | 0 | |
|
Northshore University Skokie Cook County |
2,500 | 4 | 1 | |
|
Clayton-Camp Point Water Commission Adams County |
2,470 | 0 | 0 | |
|
Pinckneyville Correctional Center Pinckneyville · Perry County |
2,470 | 0 | 0 | |
|
IL American-Villa Grove Villa Grove · Douglas County |
2,467 | 0 | 0 | |
|
Blessing Hospital Adams County |
2,460 | 0 | 0 | |
|
Park City MHP Park City · Lake County |
2,460 | 1 | 0 | |
|
Galva Galva · Henry County |
2,449 | 1 | 0 | |
|
IL American-Farmington Farmington · Fulton County |
2,448 | 0 | 0 | |
|
Central Stickney SD Cook County |
2,400 | 3 | 0 | |
|
Lewistown Lewistown · Fulton County |
2,400 | 0 | 0 | |
|
West Prairie Water Co-Op Colchester · McDonough County |
2,395 | 0 | 0 | |
|
Ewing-Ina Water Commission Franklin County |
2,393 | 2 | 0 | |
|
Mason City Mason City · Mason County |
2,393 | 0 | 0 | |
|
Thornton Thornton · Cook County |
2,386 | 2 | 1 | |
|
Catlin Catlin · Vermilion County |
2,380 | 4 | 2 | |
|
Ellery Water Corp Albion · Edwards County |
2,380 | 0 | 0 | |
|
Dawson Dawson · Sangamon County |
2,375 | 5 | 1 | |
|
Poplar Grove Poplar Grove · Boone County |
2,372 | 3 | 0 | |
|
Nokomis Montgomery County |
2,370 | 1 | 1 | |
|
Akin Water District Franklin County |
2,368 | 0 | 0 | |
|
Lick Creek Pwd Union County |
2,365 | 2 | 0 | |
|
Hickory-Kerton Wtr Coop Schuyler County |
2,358 | 0 | 0 | |
|
I74 Spoon River Rest Area Knox County |
2,356 | 0 | 0 | |
|
Polo Polo · Ogle County |
2,355 | 0 | 0 |
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.