Revised Total Coliform Rule (RTCR) violations in Illinois
829 active public water systems in Illinois had a Revised Total Coliform Rule (RTCR) violation in the past three years, 196 of them in the latest quarter of EPA's data. What Revised Total Coliform Rule (RTCR) is and why it matters.
Systems with a Revised Total Coliform Rule (RTCR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Huntley Huntley · McHenry County |
28,495 | 1 | 0 | |
|
Batavia Batavia · Kane County |
26,098 | 2 | 0 | |
|
Lockport Lockport · Will County |
23,100 | 4 | 0 | |
|
Crest Hill Crest Hill · Will County |
20,223 | 10 | 2 | |
|
LA Grange Park La Grange Park · Cook County |
13,011 | 2 | 0 | |
|
Plano Plano · Kendall County |
12,600 | 3 | 0 | |
|
Robinson-Palestine Water Commission Crawford County |
11,331 | 3 | 0 | |
|
Waterloo Waterloo · Monroe County |
10,190 | 7 | 0 | |
|
LA Salle La Salle · LaSalle County |
9,700 | 4 | 0 | |
|
Harrisburg Harrisburg · Saline County |
8,524 | 6 | 1 | |
|
Silvis Silvis · Rock Island County |
7,473 | 7 | 1 | |
|
Duquoin Du Quoin · Perry County |
7,169 | 6 | 2 | |
|
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 | |
|
Chillicothe Chillicothe · Peoria County |
6,660 | 5 | 0 | |
|
Bond/madison Water Company Bond County |
6,645 | 4 | 0 | |
|
Illinois State University-Normal Normal · McLean County |
6,600 | 4 | 0 | |
|
Northshore University Evanston Cook County |
6,300 | 4 | 1 | |
|
Wilmington Wilmington · Will County |
5,700 | 7 | 0 | |
|
Eastern Illinois University Charleston · Coles County |
5,500 | 3 | 0 | |
|
Robbins Robbins · Cook County |
5,415 | 6 | 3 | |
|
U of I Chicago Medical Center Cook County |
5,000 | 4 | 1 | |
|
Milan Milan · Rock Island County |
4,945 | 3 | 1 | |
|
Tuscola Tuscola · Douglas County |
4,875 | 4 | 1 | |
|
Auburn Auburn · Sangamon County |
4,574 | 3 | 0 | |
|
Hometown Hometown · Cook County |
4,240 | 2 | 1 | |
|
Burnham Burnham · Cook County |
3,989 | 7 | 3 | |
|
Greene County Rwd Greene County |
3,786 | 3 | 0 | |
|
Gillespie Macoupin County |
3,737 | 8 | 3 | |
|
Lutheran General Hospital Cook County |
3,400 | 6 | 1 | |
|
Pontoon Beach Pwd Pontoon Beach · Madison County |
3,325 | 3 | 0 | |
|
Mount Sterling Mount Sterling · Brown County |
3,271 | 2 | 0 | |
|
Northshore Univ Glenbrook Cook County |
3,200 | 4 | 1 | |
|
Arcola Arcola · Douglas County |
2,927 | 4 | 0 | |
|
Albion Albion · Edwards County |
2,839 | 4 | 0 | |
|
Bridgeport Bridgeport · Lawrence County |
2,572 | 4 | 0 | |
|
Coal City Area Club Grundy County |
2,500 | 1 | 0 | |
|
Northshore University Skokie Cook County |
2,500 | 4 | 1 | |
|
Catlin Catlin · Vermilion County |
2,380 | 4 | 2 | |
|
Poplar Grove Poplar Grove · Boone County |
2,372 | 3 | 0 | |
|
Mount Olive Macoupin County |
2,193 | 6 | 2 | |
|
Southeast Joliet SD Joliet · Will County |
2,000 | 8 | 3 | |
|
Waubonsee Community College Kane County |
2,000 | 7 | 0 | |
|
Dix-Kell Water Commssion Jefferson County |
1,972 | 2 | 0 | |
|
Wonder Lake (niu) McHenry County |
1,950 | 2 | 0 | |
|
Waltonville Waltonville · Jefferson County |
1,901 | 3 | 0 | |
|
South Roxana South Roxana · Madison County |
1,891 | 6 | 1 | |
|
Poplar Grove South Poplar Grove · Boone County |
1,877 | 5 | 1 | |
|
Hudson Hudson · McLean County |
1,847 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Revised Total Coliform Rule (RTCR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Revised Total Coliform Rule (RTCR) alone.
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.