EPA Air · stack tests by county and year
Air-emissions stack tests in Montgomery County, Illinois, 2026
- 15Stack 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 Montgomery County, Illinois during 2026. 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 Montgomery County facility page.
Air-emissions stack tests in Montgomery County, other years
Air-emissions stack tests recorded in Montgomery County, Illinois, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-04-02 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-04-01 | HILLSBORO ENERGY LLC | Pass | State |
| 2026-03-04 | US MINERALS | 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 Montgomery county, IL, for 2026. Stack tests recorded in 2026: 15.