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 |
|---|---|---|---|---|
|
Spectrum Preferred Meats Ogle County |
60 | 7 | 1 | |
|
Career Center of Southern Illinois Monroe County |
50 | 9 | 2 | |
|
Focus House Ogle County |
50 | 6 | 0 | |
|
Kindercare McHenry McHenry County |
50 | 4 | 0 | |
|
Primrose School Lake County |
50 | 4 | 0 | |
|
Tegrant Sonoco Protective Solutions Will County |
50 | 6 | 0 | |
|
Will CO Forest Preserve Dist Will County |
50 | 6 | 2 | |
|
Carmel Montessori Academy DuPage County |
40 | 6 | 1 | |
|
Wells Concrete McHenry County |
40 | 5 | 0 | |
|
JX Peterbilt Lake County |
34 | 5 | 1 | |
|
Wedron Silica Sand Company LaSalle County |
29 | 6 | 1 | |
|
J M Huber Well 2 Adams County |
26 | 8 | 2 | |
|
Jimmy Johns (prospect Crossing) Cook County |
25 | 1 | 0 | |
|
Peaceful Pathways Kendall County |
25 | 6 | 0 | |
|
Wedron Silica 2 LaSalle County |
25 | 5 | 1 | |
|
Winnebago County Rock 39 Winnebago County |
25 | 7 | 1 | |
|
Wtvo TV Winnebago County |
25 | 5 | 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.