1,2,4-Trichlorobenzene violations in Illinois
196 active public water systems in Illinois had a 1,2,4-Trichlorobenzene violation in the past three years, 10 of them still unresolved. What 1,2,4-Trichlorobenzene is and why it matters.
Systems with a 1,2,4-Trichlorobenzene violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Fox Lake Fox Lake · Lake County |
11,780 | 5 | 1 | |
|
Prospect Heights Plaza Cook County |
1,240 | 6 | 2 | |
|
Vienna Correctional Center Johnson County |
501 | 3 | 0 | |
|
Cog Hill Country Club Cook County |
340 | 3 | 1 | |
|
Maranatha Bible Church Cook County |
213 | 3 | 0 | |
|
Mindhaven Academy McHenry County |
100 | 7 | 1 | |
|
Criswell Court MHP Joliet · Will County |
94 | 8 | 3 | |
|
Carmel Montessori Academy DuPage County |
40 | 6 | 1 | |
|
Walnut Grove MHC Champaign County |
40 | 5 | 0 | |
|
Winnebago Landfill Winnebago County |
25 | 3 | 0 | |
|
Arlington Heights Arlington Heights · Cook County |
73,320 | 3 | 2 | |
|
McHenry Mchenry · McHenry County |
22,335 | 2 | 0 | |
|
Waterloo Waterloo · Monroe County |
10,190 | 7 | 0 | |
|
Sauk Village Sauk · Cook County |
9,921 | 4 | 0 | |
|
Staunton Staunton · Macoupin County |
5,756 | 4 | 0 | |
|
Breese Breese · Clinton County |
4,772 | 4 | 0 | |
|
Jbs Corporation Cass County |
2,000 | 7 | 1 | |
|
Waubonsee Community College Kane County |
2,000 | 7 | 0 | |
|
Northwest Bible Baptist Church Kane County |
1,600 | 4 | 0 | |
|
Exxon Mobil Oil Refinery Will County |
1,450 | 5 | 2 | |
|
Cat Tech Center Peoria County |
1,442 | 2 | 0 | |
|
Tower Lakes Tower Lakes · Lake County |
1,372 | 1 | 0 | |
|
Riverdale School District #100 Rock Island County |
1,340 | 10 | 0 | |
|
Good Shepherd Hospital Lake County |
1,290 | 8 | 2 | |
|
Woodlawn Middle/country Meadow Elem Lake County |
1,100 | 5 | 0 | |
|
Central High School Kane County |
1,001 | 6 | 2 | |
|
Olympia School McLean County |
918 | 7 | 0 | |
|
Clifton Central High School Iroquois County |
875 | 5 | 0 | |
|
Fremont Elementary School K-2 Lake County |
800 | 1 | 0 | |
|
Caledonia School Boone County |
750 | 7 | 1 | |
|
Central Middle School Kane County |
750 | 5 | 1 | |
|
Merichkas Will County |
700 | 4 | 0 | |
|
Snap on Tools McHenry County |
700 | 7 | 0 | |
|
Ferson Creek Elem Schl-Cusd 303 Kane County |
667 | 6 | 1 | |
|
Millburn School Dist #24 Lake County |
650 | 2 | 0 | |
|
Shops of Kildeer Lake County |
650 | 7 | 2 | |
|
Balmoral Elem Will County |
645 | 4 | 1 | |
|
Ashmore Ashmore · Coles County |
637 | 8 | 0 | |
|
Wayne School DuPage County |
625 | 4 | 0 | |
|
Indian Knoll School Dist 33 DuPage County |
600 | 3 | 0 | |
|
Kildeer Countryside School Lake County |
600 | 5 | 0 | |
|
Howard B Thomas Grade School Kane County |
575 | 5 | 1 | |
|
Gavin Central Elementary Lake County |
560 | 5 | 2 | |
|
Stone Creek School Winnebago County |
543 | 4 | 0 | |
|
Prairie View Elementary School Kane County |
508 | 6 | 1 | |
|
Biltmore C C Main Building Lake County |
500 | 6 | 1 | |
|
North Boone High School Boone County |
500 | 6 | 2 | |
|
Spring Grove Elementary School McHenry County |
500 | 6 | 0 | |
|
Cornerstone Christian Academy McLean County |
475 | 5 | 0 | |
|
Ledgewood Elementary School Winnebago County |
470 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved 1,2,4-Trichlorobenzene, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not 1,2,4-Trichlorobenzene 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.