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 |
|---|---|---|---|---|
|
Kaneland High School Kane County |
1,800 | 5 | 0 | |
|
Crainville Crainville · Williamson County |
1,711 | 3 | 0 | |
|
Pontiac Correctional Center Pontiac · Livingston County |
1,665 | 4 | 1 | |
|
Jerome Jerome · Sangamon County |
1,600 | 3 | 0 | |
|
Germantown Germantown · Clinton County |
1,537 | 5 | 1 | |
|
Maple Park Maple Park · Kane County |
1,484 | 6 | 1 | |
|
Exxon Mobil Oil Refinery Will County |
1,450 | 5 | 2 | |
|
Cat Tech Center Peoria County |
1,442 | 2 | 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 | |
|
Nilwood Nilwood · Macoupin County |
1,394 | 2 | 0 | |
|
Hilltop MHP Bloomington · McLean County |
1,360 | 7 | 2 | |
|
Capron Capron · Boone County |
1,343 | 3 | 0 | |
|
Riverdale School District #100 Rock Island County |
1,340 | 10 | 0 | |
|
Ashland Ashland · Cass County |
1,333 | 3 | 0 | |
|
Rossville Rossville · Vermilion County |
1,331 | 3 | 0 | |
|
Milford Milford · Iroquois County |
1,306 | 5 | 2 | |
|
Taylorville Correctional Center Taylorville · Christian County |
1,300 | 2 | 0 | |
|
Good Shepherd Hospital Lake County |
1,290 | 8 | 2 | |
|
Lake Williamson Christian Center Macoupin County |
1,250 | 4 | 0 | |
|
Cuba Cuba · Fulton County |
1,232 | 2 | 0 | |
|
Hillcrest Hillcrest · Ogle County |
1,224 | 5 | 0 | |
|
Nauvoo Nauvoo · Hancock County |
1,200 | 3 | 0 | |
|
Mechanicsburg-Buffalo Water Commission Sangamon County |
1,170 | 7 | 2 | |
|
Atwood Atwood · Douglas County |
1,155 | 2 | 0 | |
|
New Berlin Sangamon County |
1,150 | 6 | 2 | |
|
Malta Malta · DeKalb County |
1,143 | 3 | 0 | |
|
IL American-Ferson Creek Kane County |
1,134 | 4 | 0 | |
|
Heartville Pwd Effingham County |
1,125 | 3 | 0 | |
|
Royalton Royalton · Franklin County |
1,118 | 6 | 0 | |
|
Enfield Enfield · White County |
1,064 | 2 | 0 | |
|
Ava Ava · Jackson County |
1,053 | 2 | 0 | |
|
Franciscan Health Olympia Fields Cook County |
1,050 | 2 | 0 | |
|
Suburban Apartments (de Kalb Univ Dvl) DeKalb County |
1,050 | 5 | 1 | |
|
Buncombe Water District Jackson County |
1,030 | 5 | 1 | |
|
Pleasant Hill Pleasant Hill · Pike County |
1,004 | 4 | 0 | |
|
Central High School Kane County |
1,001 | 6 | 2 | |
|
Stateville Correctional Center Joliet · Will County |
992 | 5 | 2 | |
|
Rest Area I-74w Mackinaw Dells Woodford County |
975 | 1 | 0 | |
|
Ramsey Ramsey · Fayette County |
966 | 3 | 0 | |
|
Wataga Wataga · Knox County |
965 | 5 | 1 | |
|
Camp Duncan Pool Lake County |
960 | 4 | 2 | |
|
Camp Independence Lake County |
960 | 4 | 2 | |
|
Clay City Clay City · Clay County |
957 | 3 | 0 | |
|
Atkinson Atkinson · Henry County |
955 | 4 | 1 | |
|
Willow Lake Estates MHP Elgin · Kane County |
920 | 6 | 0 | |
|
Olympia School McLean County |
918 | 7 | 0 | |
|
Grand Valley Village MHP Springfield · Sangamon County |
912 | 4 | 1 | |
|
Oreana Oreana · Macon County |
892 | 3 | 1 |
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.