Mercury violations in Illinois
80 active public water systems in Illinois had a Mercury violation in the past three years, 2 of them still unresolved. What Mercury is and why it matters.
Systems with a Mercury violation
Unresolved 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 | |
|
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 | |
|
Lakemoor Lakemoor · Lake County |
2,720 | 3 | 1 | |
|
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 | |
|
IL American-Walk UP Woods McHenry County |
775 | 3 | 0 | |
|
North Barrington Elm School Lake County |
700 | 3 | 1 | |
|
IL American-Bahl Water Company Jo Daviess County |
700 | 7 | 1 | |
|
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 | |
|
Naplate Naplate · LaSalle County |
465 | 2 | 0 | |
|
Lord of Glory/gloryland Pre-Sc Lake County |
350 | 2 | 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 | |
|
Cabery Cabery · Ford County |
266 | 6 | 2 | |
|
North Boone Upper Elementary School Boone County |
262 | 7 | 1 | |
|
Scot Forge McHenry County |
253 | 3 | 1 | |
|
IL American-Valentine Lake County |
252 | 3 | 0 | |
|
Riverview Grade School Woodford County |
240 | 3 | 0 | |
|
North Boone Middle School Boone County |
230 | 8 | 2 | |
|
Countryside School Cook County |
225 | 3 | 0 | |
|
Saint Patrick School Lake County |
225 | 5 | 1 | |
|
Sylvan Lake 1st Subdivision Lake County |
210 | 6 | 0 | |
|
Cortland Corners MHP DeKalb County |
205 | 10 | 3 | |
|
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 | |
|
Northwest Comm Hosp Outpt Care Lake County |
200 | 8 | 1 | |
|
Rockland Office Plaza Lake County |
200 | 7 | 1 | |
|
ST George School Kankakee County |
200 | 3 | 0 | |
|
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 | |
|
Barbara Rose Elementary School Cook County |
150 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Mercury, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Mercury 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.