Combined Radium (-226 and -228) violations in Illinois
76 active public water systems in Illinois had a Combined Radium (-226 and -228) violation in the past three years, 11 of them in the latest quarter of EPA's data. What Combined Radium (-226 and -228) is and why it matters.
Systems with a Combined Radium (-226 and -228) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Genoa Genoa · DeKalb County |
5,298 | 3 | 0 | |
|
Oregon Oregon · Ogle County |
3,449 | 4 | 1 | |
|
IL American-Galena Jo Daviess County |
2,294 | 1 | 0 | |
|
Steeleville Steeleville · Randolph County |
1,960 | 5 | 2 | |
|
Stockton Stockton · Jo Daviess County |
1,728 | 1 | 0 | |
|
Maple Park Maple Park · Kane County |
1,484 | 6 | 1 | |
|
Percy Percy · Randolph County |
961 | 4 | 0 | |
|
South Wilmington South Wilmington · Grundy County |
710 | 4 | 2 | |
|
Cortland Corners MHP DeKalb County |
205 | 10 | 3 | |
|
Walnut Grove MHC Champaign County |
40 | 5 | 0 | |
|
Seneca Mobile Homes LLC LaSalle County |
10 | 2 | 0 | |
|
Joliet Joliet · Will County |
160,000 | 4 | 0 | |
|
Elk Grove Village Elk Grove · Cook County |
31,802 | 4 | 1 | |
|
Rolling Meadows Rolling Meadows · Cook County |
23,329 | 3 | 1 | |
|
Lake Zurich Lake Zurich · Lake County |
19,759 | 1 | 0 | |
|
Ottawa Ottawa · LaSalle County |
18,097 | 3 | 0 | |
|
Troy Troy · Madison County |
16,962 | 2 | 0 | |
|
Western Springs Western Springs · Cook County |
13,629 | 3 | 1 | |
|
Pingree Grove Hampshire · Kane County |
10,365 | 4 | 1 | |
|
Waterloo Waterloo · Monroe County |
10,190 | 7 | 0 | |
|
Monmouth Monmouth · Warren County |
8,902 | 2 | 0 | |
|
Clarendon Hills Clarendon Hills · DuPage County |
8,702 | 1 | 0 | |
|
Silvis Silvis · Rock Island County |
7,473 | 7 | 1 | |
|
Mount Carmel Mount Carmel · Wabash County |
7,015 | 5 | 0 | |
|
Sangamon Valley Pwd Champaign County |
5,300 | 2 | 0 | |
|
Lawrenceville Lawrenceville · Lawrence County |
4,524 | 7 | 2 | |
|
Aqua Illinois-Hawthorn Woods Lake County |
3,065 | 3 | 0 | |
|
Oasis MHP Cook County |
3,000 | 1 | 0 | |
|
Dawson Dawson · Sangamon County |
2,375 | 5 | 1 | |
|
Arthur Arthur · Moultrie County |
2,300 | 1 | 0 | |
|
Carbon Cliff Carbon Cliff · Rock Island County |
2,134 | 4 | 0 | |
|
Rockdale Rockdale · Will County |
2,012 | 5 | 3 | |
|
Durand Durand · Winnebago County |
1,427 | 2 | 0 | |
|
North Utica North Utica · LaSalle County |
1,323 | 3 | 0 | |
|
Blackhawk Estates LLC Cook County |
1,238 | 3 | 1 | |
|
Laharpe La Harpe · Hancock County |
1,200 | 5 | 1 | |
|
Suburban Apartments (de Kalb Univ Dvl) DeKalb County |
1,050 | 5 | 1 | |
|
Wenona Wenona · Marshall County |
974 | 6 | 1 | |
|
Ridge Farm Ridge Farm · Vermilion County |
973 | 2 | 0 | |
|
Rapids City Cordova · Rock Island County |
962 | 3 | 1 | |
|
Shady Oaks MHP Grundy County |
912 | 3 | 0 | |
|
Argenta Argenta · Macon County |
900 | 4 | 1 | |
|
Sheffield Sheffield · Bureau County |
821 | 2 | 0 | |
|
Pearl City Pearl City · Stephenson County |
790 | 4 | 2 | |
|
North Regional Water Fac DuPage County |
770 | 1 | 0 | |
|
Fyre Lake Water Company Mercer County |
760 | 3 | 0 | |
|
Ashmore Ashmore · Coles County |
637 | 8 | 0 | |
|
Rankin Rankin · Vermilion County |
500 | 4 | 1 | |
|
IL American-Wildwood Rockford · Winnebago County |
490 | 1 | 0 | |
|
Joppa Joppa · Massac County |
445 | 3 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Combined Radium (-226 and -228), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Combined Radium (-226 and -228) 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.