EPA Air · stack tests by county and year
Air-emissions stack tests in Polk County, Iowa, 2025
- 16Stack 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 Polk County, Iowa 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 Polk County facility page.
Polk County, Iowa, 2025
- Inspections 304
Air-emissions stack tests in Polk County, other years
Air-emissions stack tests recorded in Polk County, Iowa, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-11-06 | METRO METHANE RECOVERY | Pass | Local |
| 2025-11-06 | METRO METHANE RECOVERY | Pass | Local |
| 2025-11-06 | METRO METHANE RECOVERY | Pass | Local |
| 2025-11-06 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | Fail | Local |
| 2025-10-09 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | Fail | Local |
| 2025-09-09 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | Pass | Local |
| 2025-09-04 | MIDAMERICAN ENERGY CO PLEASANT HILL GDMEC | Pass | Local |
| 2025-09-03 | MIDAMERICAN ENERGY CO PLEASANT HILL GDMEC | Pass | Local |
| 2025-07-22 | BRIDGESTONE AMERICAS TIRE OPERATIONS | Pass | Local |
| 2025-07-21 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | Pass | Local |
| 2025-05-01 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | Fail | Local |
| 2025-05-01 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | Pass | Local |
| 2025-03-26 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | Fail | Local |
| 2025-03-25 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | Fail | Local |
| 2025-01-31 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | Fail | Local |
| 2025-01-08 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | Fail | Local |
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 Polk county, IA, in 2025. It lists 16 stack tests recorded in 2025.