EPA Air · stack tests by county and year
Air-emissions stack tests in Grundy County, Illinois, 2025
- 6Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Grundy County, Illinois during 2025. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Grundy County facility page.
Grundy County, Illinois, 2025
- Inspections 10
Air-emissions stack tests in Grundy County, other years
What stands out
- Stack tests in Grundy County, Illinois, rose from 3 in 2021, the previous year on file, to 6 in 2025.
- The county’s file for stack tests holds 3 years of events, from 2017 through 2025.
- Its 6 stack tests rank 15th of the 28 county cells in Illinois for 2025.
- Its 6 stack tests are 2.3% of the 264 the state’s file holds for 2025.
Every line is computed by formula from the state’s stored file; nothing is estimated.
Air-emissions stack tests recorded in Grundy County, Illinois, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-10-07 | NOURYON SURFACE CHEMISTRY LLC | Pass | State |
| 2025-10-07 | NOURYON SURFACE CHEMISTRY LLC | Pass | State |
| 2025-07-15 | NOURYON SURFACE CHEMISTRY LLC | Pass | State |
| 2025-03-19 | MORRIS COGENERATION LLC | Pass | State |
| 2025-03-18 | MORRIS COGENERATION LLC | Pass | State |
| 2025-03-17 | MORRIS COGENERATION LLC | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Grundy county, IL, in 2025. The stack tests recorded in 2025 total 6.