All water systems in Illinois
5,097 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Four Seasons MHP Boone County |
1,468 | 3 | 0 | |
|
Okawville Okawville · Washington County |
1,457 | 1 | 0 | |
|
Exxon Mobil Oil Refinery Will County |
1,450 | 5 | 2 | |
|
Silvis Heights Water Corp Rock Island County |
1,450 | 7 | 3 | |
|
Cat Tech Center Peoria County |
1,442 | 2 | 0 | |
|
Oakbrook Terrace Oak Brook Terr · DuPage County |
1,440 | 0 | 0 | |
|
Crystal Lawns Addition Improvement Assoc Joliet · Will County |
1,435 | 3 | 1 | |
|
South Fulton Water District Fulton County |
1,430 | 1 | 0 | |
|
Devils Kitchen Water District Williamson County |
1,428 | 6 | 1 | |
|
Durand Durand · Winnebago County |
1,427 | 2 | 0 | |
|
Wynstone Water Company Lake County |
1,424 | 1 | 1 | |
|
York Township Water System Oak Brook Terr · DuPage County |
1,423 | 1 | 1 | |
|
Sandoval Sandoval · Marion County |
1,422 | 0 | 0 | |
|
Gridley Gridley · McLean County |
1,411 | 0 | 0 | |
|
Pembroke Township Kankakee County |
1,410 | 4 | 1 | |
|
Onarga Onarga · Iroquois County |
1,409 | 3 | 0 | |
|
Grandview Grandview · Sangamon County |
1,405 | 3 | 1 | |
|
Murrayville-Woodson Water Commission Morgan County |
1,403 | 3 | 0 | |
|
Sunset MHP Cook County |
1,400 | 2 | 0 | |
|
Neoga Neoga · Cumberland County |
1,398 | 1 | 0 | |
|
Centralia Correctional Site Centralia · Clinton County |
1,397 | 0 | 0 | |
|
Colchester Colchester · McDonough County |
1,395 | 0 | 0 | |
|
Nilwood Nilwood · Macoupin County |
1,394 | 2 | 0 | |
|
Payson Payson · Adams County |
1,386 | 0 | 0 | |
|
Aqua Illinois-Philo Philo · Champaign County |
1,378 | 0 | 0 | |
|
Astoria Astoria · Fulton County |
1,375 | 1 | 0 | |
|
IL American-Hardin County Hardin County |
1,373 | 0 | 0 | |
|
Tower Lakes Tower Lakes · Lake County |
1,372 | 1 | 0 | |
|
Gallatin-White Water District Gallatin County |
1,370 | 0 | 0 | |
|
Hebron Hebron · McHenry County |
1,368 | 2 | 1 | |
|
Gardner Gardner · Grundy County |
1,361 | 0 | 0 | |
|
Hilltop MHP Bloomington · McLean County |
1,360 | 7 | 2 | |
|
Granville Granville · Putnam County |
1,359 | 0 | 0 | |
|
Cerro Gordo Cerro Gordo · Piatt County |
1,350 | 2 | 1 | |
|
Tilden Tilden · Randolph County |
1,350 | 2 | 1 | |
|
Toluca Toluca · Marshall County |
1,348 | 0 | 0 | |
|
Capron Capron · Boone County |
1,343 | 3 | 0 | |
|
Riverdale School District #100 Rock Island County |
1,340 | 10 | 0 | |
|
Bonnie Brae Forest Manor Sndst Lockport · Will County |
1,338 | 1 | 0 | |
|
Forreston Forreston · Ogle County |
1,338 | 0 | 0 | |
|
Ashland Ashland · Cass County |
1,333 | 3 | 0 | |
|
Rossville Rossville · Vermilion County |
1,331 | 3 | 0 | |
|
North Utica North Utica · LaSalle County |
1,323 | 3 | 0 | |
|
Warren Warren · Jo Daviess County |
1,323 | 2 | 1 | |
|
East Moreland Wtr Service Assn New Lenox · Will County |
1,320 | 4 | 3 | |
|
Harristown Harristown · Macon County |
1,320 | 1 | 1 | |
|
Barry Barry · Pike County |
1,318 | 2 | 1 | |
|
Otter Lake Water Commission Macoupin County |
1,318 | 0 | 0 | |
|
Assumption Assumption · Christian County |
1,315 | 4 | 2 | |
|
Walnut Walnut · Bureau County |
1,311 | 2 | 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.