All water systems in Illinois
5,097 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Seneca Seneca · LaSalle County |
2,353 | 0 | 0 | |
|
Davis Junction Davis Junction · Ogle County |
2,344 | 0 | 0 | |
|
Otter Creek Lake Utilities District Loves Park · Winnebago County |
2,342 | 1 | 0 | |
|
Aqua Illinois-Timber Ridge Matteson · Cook County |
2,322 | 0 | 0 | |
|
Oblong Oblong · Crawford County |
2,321 | 0 | 0 | |
|
White Hall White Hall · Greene County |
2,313 | 5 | 0 | |
|
Arthur Arthur · Moultrie County |
2,300 | 1 | 0 | |
|
Lake Barrington Shores Subdivsion Lake Barrington · Lake County |
2,300 | 2 | 0 | |
|
IL American-Galena Jo Daviess County |
2,294 | 1 | 0 | |
|
Prospect Heights Prospect Heights · Cook County |
2,280 | 1 | 0 | |
|
T-L Rural Water District Peoria County |
2,243 | 2 | 0 | |
|
Henry Henry · Marshall County |
2,230 | 1 | 1 | |
|
Elwood Elwood · Will County |
2,229 | 3 | 1 | |
|
Tamaroa Tamaroa · Perry County |
2,197 | 0 | 0 | |
|
Pecatonica Pecatonica · Winnebago County |
2,195 | 0 | 0 | |
|
Mount Olive Macoupin County |
2,193 | 6 | 2 | |
|
Groveland Township Water District Tazewell County |
2,185 | 0 | 0 | |
|
Southwater INC Alexander County |
2,185 | 0 | 0 | |
|
Thomson Maximum Security Center Thomson · Carroll County |
2,166 | 0 | 0 | |
|
Graham Correctional Site Hillsboro · Montgomery County |
2,155 | 0 | 0 | |
|
Norris City Norris City · White County |
2,155 | 1 | 0 | |
|
Carbon Cliff Carbon Cliff · Rock Island County |
2,134 | 4 | 0 | |
|
Tremont Tremont · Tazewell County |
2,114 | 0 | 0 | |
|
Richmond Richmond · McHenry County |
2,089 | 0 | 0 | |
|
Cambridge Cambridge · Henry County |
2,086 | 0 | 0 | |
|
Carrier Mills Carrier Mills · Saline County |
2,085 | 1 | 0 | |
|
EJ Water-McWc Hillsboro · Montgomery County |
2,083 | 2 | 0 | |
|
Elmwood Elmwood · Peoria County |
2,058 | 0 | 0 | |
|
Henderson Pwd Montgomery County |
2,045 | 4 | 0 | |
|
IL American-Fisher Fisher · Champaign County |
2,026 | 0 | 0 | |
|
Limestone-Walters Pwd Peoria County |
2,023 | 3 | 0 | |
|
Teutopolis Teutopolis · Effingham County |
2,018 | 0 | 0 | |
|
Clay County Water INC Clay County |
2,015 | 0 | 0 | |
|
Rockdale Rockdale · Will County |
2,012 | 5 | 3 | |
|
ST Jacob Saint Jacob · Madison County |
2,008 | 4 | 1 | |
|
Hinckley Hinckley · DeKalb County |
2,006 | 0 | 0 | |
|
Jbs Corporation Cass County |
2,000 | 7 | 1 | |
|
Roanoke Roanoke · Woodford County |
2,000 | 1 | 0 | |
|
Southeast Joliet SD Joliet · Will County |
2,000 | 8 | 3 | |
|
Waubonsee Community College Kane County |
2,000 | 7 | 0 | |
|
Phoenix Phoenix · Cook County |
1,994 | 4 | 2 | |
|
Dix-Kell Water Commssion Jefferson County |
1,972 | 2 | 0 | |
|
Mitchellsville Pwd Saline County |
1,970 | 3 | 0 | |
|
New Athens New Athens · St. Clair County |
1,970 | 1 | 0 | |
|
Merrionette Park Merrionette Park · Cook County |
1,969 | 3 | 2 | |
|
Steeleville Steeleville · Randolph County |
1,960 | 5 | 2 | |
|
Sterling Estates MHP Justice · Cook County |
1,954 | 1 | 0 | |
|
Clinton County East Pwd Clinton County |
1,950 | 2 | 0 | |
|
Wonder Lake (niu) McHenry County |
1,950 | 2 | 0 | |
|
Prophetstown Prophetstown · Whiteside County |
1,946 | 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.