EPA Air · stack tests by county and year
Air-emissions stack tests in Spencer County, Indiana, 2025
- 10Stack 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 Spencer County, Indiana 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 Spencer County facility page.
Air-emissions stack tests in Spencer County, other years
Air-emissions stack tests recorded in Spencer County, Indiana, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-22 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | Pass | State |
| 2025-12-22 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | Pass | State |
| 2025-09-24 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | Pass | State |
| 2025-09-24 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | Pass | State |
| 2025-09-24 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | Pass | State |
| 2025-09-23 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | Pass | State |
| 2025-09-23 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | Pass | State |
| 2025-09-23 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | Pass | State |
| 2025-06-05 | CLEVELAND-CLIFFS STEEL CORPORATION, ROCKPORT WORKS | Pass | State |
| 2025-06-03 | CLEVELAND-CLIFFS STEEL CORPORATION, ROCKPORT WORKS | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.