Hexachlorocyclopentadiene violations in Illinois
62 active public water systems in Illinois had a Hexachlorocyclopentadiene violation in the past three years, 12 of them still unresolved. What Hexachlorocyclopentadiene is and why it matters.
Systems with a Hexachlorocyclopentadiene violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Highland Highland · Madison County |
10,674 | 3 | 0 | |
|
Staunton Staunton · Macoupin County |
5,756 | 4 | 0 | |
|
Prospect Heights Plaza Cook County |
1,240 | 6 | 2 | |
|
Vienna Correctional Center Johnson County |
501 | 3 | 0 | |
|
Maranatha Bible Church Cook County |
213 | 3 | 0 | |
|
Mindhaven Academy McHenry County |
100 | 7 | 1 | |
|
Criswell Court MHP Joliet · Will County |
94 | 8 | 3 | |
|
Career Center of Southern Illinois Monroe County |
50 | 9 | 2 | |
|
Gpwd Center Will County |
50 | 3 | 0 | |
|
Walnut Grove MHC Champaign County |
40 | 5 | 0 | |
|
Nussbaum Transportation Well #3 McLean County |
30 | 2 | 0 | |
|
Winnebago Landfill Winnebago County |
25 | 3 | 0 | |
|
Naperville Naperville · DuPage County |
156,406 | 1 | 0 | |
|
Crystal Lake Crystal Lake · McHenry County |
40,661 | 1 | 0 | |
|
Lockport Lockport · Will County |
23,100 | 4 | 0 | |
|
Manhattan Manhattan · Will County |
10,340 | 1 | 0 | |
|
IL American-Whispering Hills McHenry County |
8,300 | 4 | 0 | |
|
Fountain Water District Valmeyer · Monroe County |
4,350 | 3 | 0 | |
|
South Jacksonville South Jacksonville · Morgan County |
3,501 | 4 | 0 | |
|
Aqua Illinois-Hawthorn Woods Lake County |
3,065 | 3 | 0 | |
|
Dawson Dawson · Sangamon County |
2,375 | 5 | 1 | |
|
Northwest Bible Baptist Church Kane County |
1,600 | 4 | 0 | |
|
Clifton Clifton · Iroquois County |
1,500 | 1 | 0 | |
|
ST Anne Saint Anne · Kankakee County |
1,200 | 4 | 0 | |
|
Pleasant Hill Pleasant Hill · Pike County |
1,004 | 4 | 0 | |
|
Quentin Road Bible Baptist School Lake County |
910 | 2 | 1 | |
|
Snap on Tools McHenry County |
700 | 7 | 0 | |
|
ST Francisville Saint Francisville · Lawrence County |
583 | 7 | 0 | |
|
Spring Grove Elementary School McHenry County |
500 | 6 | 0 | |
|
Quentin RD Bible Baptist CH Lake County |
499 | 2 | 1 | |
|
Bay View Baptist Church Tazewell County |
425 | 2 | 0 | |
|
Victory Christian Center McLean County |
325 | 8 | 1 | |
|
Whole Foods Mart Kildeer Well Lake County |
250 | 3 | 1 | |
|
North Boone Middle School Boone County |
230 | 8 | 2 | |
|
Bone Gap Bone Gap · Edwards County |
209 | 5 | 1 | |
|
Kishwaukee College DeKalb County |
200 | 5 | 0 | |
|
Rockland Office Plaza Lake County |
200 | 7 | 1 | |
|
ST George School Kankakee County |
200 | 3 | 0 | |
|
Country Estates Subdivision Henry County |
188 | 5 | 2 | |
|
Evonik Corporation Peoria County |
150 | 4 | 1 | |
|
Obrien Steel Woodford County |
150 | 2 | 0 | |
|
Meadows Mennonite Home McLean County |
140 | 8 | 1 | |
|
Watch E Kee Manufactured Home Community Iroquois County |
138 | 1 | 0 | |
|
South Barrington Partners, LLC Cook County |
121 | 5 | 0 | |
|
Mexichem Speciality Resins (orbia Polyme Marshall County |
100 | 4 | 1 | |
|
TC Industries McHenry County |
100 | 3 | 0 | |
|
Loves Travel Stop Ogle County |
80 | 6 | 2 | |
|
Trinity Lutheran School Randolph County |
80 | 9 | 1 | |
|
Pork King McHenry County |
75 | 1 | 0 | |
|
Ads Valley View Landfill, INC Macon County |
60 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Hexachlorocyclopentadiene, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Hexachlorocyclopentadiene 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. Retrieved from ECHO on Oct 11, 2026.