EPA Air · stack tests by county and year
Air-emissions stack tests in Clay County, Missouri, 2026
- 4Stack 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 Clay County, Missouri 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 Clay County facility page.
Clay County, Missouri, 2026
- Inspections 11
Air-emissions stack tests in Clay County, other years
Air-emissions stack tests recorded in Clay County, Missouri, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-09-23 | HUNT MARTIN MATERIALS LLC-RANDOLPH MINE | Pass | State |
| 2026-09-23 | HUNT MARTIN MATERIALS LLC-RANDOLPH MINE | Pass | State |
| 2026-09-23 | HUNT MARTIN MATERIALS LLC-RANDOLPH MINE | Pass | State |
| 2026-09-23 | HUNT MARTIN MATERIALS LLC-RANDOLPH MINE | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.