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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Marion county, IA, in 2025. It lists 21 stack tests recorded in 2025.