All water systems in Illinois
5,097 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Glencoe Forest Park · Cook County |
8,849 | 0 | 0 | |
|
Lake Villa Lake Villa · Lake County |
8,829 | 1 | 0 | |
|
Mascoutah Mascoutah · St. Clair County |
8,759 | 1 | 1 | |
|
Beach Park Beach Park · Lake County |
8,710 | 0 | 0 | |
|
Clarendon Hills Clarendon Hills · DuPage County |
8,702 | 1 | 0 | |
|
West Frankfort West Frankfort · Franklin County |
8,650 | 0 | 0 | |
|
Rock Falls Rock Falls · Whiteside County |
8,620 | 1 | 0 | |
|
Harrisburg Harrisburg · Saline County |
8,524 | 6 | 1 | |
|
Calumet Park Calumet Park · Cook County |
8,442 | 3 | 2 | |
|
IL American-Jerseyville Jerseyville · Jersey County |
8,412 | 0 | 0 | |
|
Chester Chester · Randolph County |
8,407 | 1 | 0 | |
|
Crete Crete · Will County |
8,386 | 4 | 0 | |
|
Gilberts Gilberts · Kane County |
8,366 | 0 | 0 | |
|
Greenville Greenville · Bond County |
8,310 | 2 | 0 | |
|
IL American-Whispering Hills McHenry County |
8,300 | 4 | 0 | |
|
Hillside Hillside · Cook County |
8,200 | 0 | 0 | |
|
Benton Benton · Franklin County |
8,104 | 5 | 1 | |
|
Island Lake Island Lake · Lake County |
8,066 | 1 | 0 | |
|
Mill Creek Water Reclamation District Kane County |
8,000 | 1 | 1 | |
|
Western Illinois University McDonough County |
8,000 | 1 | 0 | |
|
Fosterburg Pwd Madison County |
7,940 | 2 | 0 | |
|
Lincolnshire Lincolnshire · Lake County |
7,940 | 1 | 1 | |
|
Salem Salem · Marion County |
7,905 | 0 | 0 | |
|
IL American-South Beloit South Beloit · Winnebago County |
7,893 | 0 | 0 | |
|
Rockton Rockton · Winnebago County |
7,863 | 2 | 0 | |
|
Long Creek Township PWS Long Creek · Macon County |
7,850 | 0 | 0 | |
|
Broadview Broadview · Cook County |
7,847 | 4 | 3 | |
|
West Dundee West Dundee · Kane County |
7,845 | 0 | 0 | |
|
Princeton Princeton · Bureau County |
7,832 | 1 | 0 | |
|
Rock Island Arsenal, US Army Rock Island County |
7,800 | 2 | 0 | |
|
Hampshire Hampshire · Kane County |
7,758 | 1 | 0 | |
|
North Tazewell Pwd East Peoria · Tazewell County |
7,625 | 1 | 0 | |
|
Vandalia Vandalia · Fayette County |
7,616 | 3 | 0 | |
|
Marengo Marengo · McHenry County |
7,572 | 0 | 0 | |
|
Silvis Silvis · Rock Island County |
7,473 | 7 | 1 | |
|
Clinton Clinton · De Witt County |
7,200 | 1 | 1 | |
|
Duquoin Du Quoin · Perry County |
7,169 | 6 | 2 | |
|
Sandwich Sandwich · DeKalb County |
7,156 | 2 | 0 | |
|
Mendota Mendota · LaSalle County |
7,100 | 3 | 0 | |
|
Abs Water Coop Adams County |
7,095 | 0 | 0 | |
|
Raccoon Water Company Marion County |
7,080 | 1 | 0 | |
|
North Riverside North Riverside · Cook County |
7,071 | 0 | 0 | |
|
Mount Carmel Mount Carmel · Wabash County |
7,015 | 5 | 0 | |
|
Aqua Illinois-University Park Pk Forest South · Will County |
7,002 | 3 | 0 | |
|
Mahomet Mahomet · Champaign County |
7,000 | 3 | 0 | |
|
Southeast Regional Water Facility DuPage County |
6,940 | 1 | 0 | |
|
Stickney Stickney · Cook County |
6,902 | 2 | 0 | |
|
American Water Oper and Maintenance, LLC St. Clair County |
6,779 | 0 | 0 | |
|
IL American-Valley View DuPage County |
6,721 | 0 | 0 | |
|
Chillicothe Chillicothe · Peoria County |
6,660 | 5 | 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.