Cyanide violations in Illinois
67 active public water systems in Illinois had a Cyanide violation in the past three years, 2 of them in the latest quarter of EPA's data. What Cyanide is and why it matters.
Systems with a Cyanide violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Equistar Chemicals LP Grundy County |
600 | 2 | 1 | |
|
Ifh Group Whiteside County |
75 | 2 | 0 | |
|
Elk Grove Village Elk Grove · Cook County |
31,802 | 4 | 1 | |
|
Crest Hill Crest Hill · Will County |
20,223 | 10 | 2 | |
|
Fox Lake Fox Lake · Lake County |
11,780 | 5 | 1 | |
|
Crete Crete · Will County |
8,386 | 4 | 0 | |
|
Kaneland High School Kane County |
1,800 | 5 | 0 | |
|
Northwest Bible Baptist Church Kane County |
1,600 | 4 | 0 | |
|
Woodlawn Middle/country Meadow Elem Lake County |
1,100 | 5 | 0 | |
|
Olympia School McLean County |
918 | 7 | 0 | |
|
Snap on Tools McHenry County |
700 | 7 | 0 | |
|
Shops of Kildeer Lake County |
650 | 7 | 2 | |
|
Kildeer Countryside School Lake County |
600 | 5 | 0 | |
|
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 | |
|
Spring Grove Elementary School McHenry County |
500 | 6 | 0 | |
|
Oakwood Twp High School Vermilion County |
350 | 7 | 2 | |
|
Apple River Apple River · Jo Daviess County |
347 | 3 | 0 | |
|
Gavin South School Lake County |
325 | 5 | 2 | |
|
Victory Christian Center McLean County |
325 | 8 | 1 | |
|
Travel Centers of America Lake County |
300 | 1 | 0 | |
|
Valley View School McHenry County |
300 | 5 | 0 | |
|
North Boone Upper Elementary School Boone County |
262 | 7 | 1 | |
|
Scot Forge McHenry County |
253 | 3 | 1 | |
|
Riverview Grade School Woodford County |
240 | 3 | 0 | |
|
North Boone Middle School Boone County |
230 | 8 | 2 | |
|
Saint Patrick School Lake County |
225 | 5 | 1 | |
|
Conagra Vermilion County |
200 | 9 | 1 | |
|
Gateway Foundation Lake County |
200 | 7 | 1 | |
|
Itw Medical McHenry County |
200 | 3 | 0 | |
|
Kishwaukee College DeKalb County |
200 | 5 | 0 | |
|
Rockland Office Plaza Lake County |
200 | 7 | 1 | |
|
Versa Press INC Woodford County |
200 | 8 | 1 | |
|
Taylor Ridge Elementary School Rock Island County |
162 | 3 | 0 | |
|
Kone INC Henry County |
160 | 3 | 0 | |
|
Tpg Pressure, Inc. Winnebago County |
151 | 8 | 1 | |
|
Christ Mission Lutheran Church Will County |
150 | 7 | 2 | |
|
Richardson Electronics Ltd Kane County |
150 | 7 | 1 | |
|
Pbc Linear Winnebago County |
140 | 6 | 1 | |
|
ST Marys School Bored Well Peoria County |
140 | 9 | 1 | |
|
Mindhaven Academy McHenry County |
100 | 7 | 1 | |
|
Loves Travel Stop Ogle County |
80 | 6 | 2 | |
|
Riverdale Preschool Center Whiteside County |
80 | 3 | 0 | |
|
Rovanco Piping System INC Will County |
80 | 4 | 0 | |
|
Trinity Lutheran School Randolph County |
80 | 9 | 1 | |
|
Vvf LLC Kane County |
75 | 6 | 1 | |
|
Posh Tots Academy Woodford County |
70 | 4 | 1 | |
|
Rooks Creek Elementary School Livingston County |
66 | 10 | 1 | |
|
Washington Mills Putnam County |
65 | 6 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Cyanide, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Cyanide 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.