EPA Air · stack tests by county and year
Air-emissions stack tests in Marion County, Iowa, 2025
- 21Stack 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 Marion 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 Marion County facility page.
Marion County, Iowa, 2025
Air-emissions stack tests in Marion County, other years
Air-emissions stack tests recorded in Marion County, Iowa, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-06-05 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-05 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-05 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-05 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-05 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-05 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-04 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-04 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-04 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-03 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-03 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-03 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-06-03 | PELLA WEST SUBSTATION — high-priority violation on file | Pass | State |
| 2025-03-26 | MID AMERICAN ENERGY CO-KNOXVILLE | Pass | State |
| 2025-03-26 | MID AMERICAN ENERGY CO-KNOXVILLE | Pass | State |
| 2025-03-26 | MID AMERICAN ENERGY CO-KNOXVILLE | Pass | State |
| 2025-03-26 | MID AMERICAN ENERGY CO-KNOXVILLE | Pass | State |
| 2025-03-25 | MID AMERICAN ENERGY CO-KNOXVILLE | Pass | State |
| 2025-03-25 | MID AMERICAN ENERGY CO-KNOXVILLE | Pass | State |
| 2025-03-25 | MID AMERICAN ENERGY CO-KNOXVILLE | Pass | State |
| 2025-03-25 | MID AMERICAN ENERGY CO-KNOXVILLE | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.