EPA Air · stack tests by county and year
Air-emissions stack tests in Butler County, Ohio, 2025
- 34Stack 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 Butler County, Ohio 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 Butler County facility page.
Butler County, Ohio, 2025
Air-emissions stack tests in Butler County, other years
Air-emissions stack tests recorded in Butler County, Ohio, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-05 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | Pass | State |
| 2025-11-21 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | Pass | State |
| 2025-11-12 | MIDDLETOWN COKE COMPANY, LLC — high-priority violation on file | Pass | State |
| 2025-10-08 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | Pass | State |
| 2025-10-08 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | Pass | State |
| 2025-10-01 | MIDDLETOWN COKE COMPANY, LLC — high-priority violation on file | Pass | State |
| 2025-08-15 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | Pass | State |
| 2025-08-15 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | Pass | State |
| 2025-07-22 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | Pass | State |
| 2025-06-13 | DUKE ENERGY INDIANA, MADISON GENERATING STATION | Pass | State |
| 2025-06-13 | DUKE ENERGY INDIANA, MADISON GENERATING STATION | Pass | State |
| 2025-06-13 | DUKE ENERGY INDIANA, MADISON GENERATING STATION | Pass | State |
| 2025-06-13 | DUKE ENERGY INDIANA, MADISON GENERATING STATION | Pass | State |
| 2025-06-13 | DUKE ENERGY INDIANA, MADISON GENERATING STATION | Pass | State |
| 2025-06-13 | DUKE ENERGY INDIANA, MADISON GENERATING STATION | Pass | State |
| 2025-06-13 | DUKE ENERGY INDIANA, MADISON GENERATING STATION | Pass | State |
| 2025-06-13 | DUKE ENERGY INDIANA, MADISON GENERATING STATION | Pass | State |
| 2025-06-06 | MIDDLETOWN COKE COMPANY, LLC — high-priority violation on file | Pass | State |
| 2025-04-28 | MIDDLETOWN COKE COMPANY, LLC — high-priority violation on file | Pass | State |
| 2025-04-16 | KOCH FOODS, INC. | Pass | State |
| 2025-04-16 | KOCH FOODS, INC. | Pass | State |
| 2025-04-15 | KOCH FOODS, INC. | Pass | State |
| 2025-03-05 | OHIO POWER PARTNERS, LLC | Pass | State |
| 2025-03-05 | OHIO POWER PARTNERS, LLC | Pass | State |
| 2025-03-05 | OHIO POWER PARTNERS, LLC | Pass | State |
| 2025-03-05 | OHIO POWER PARTNERS, LLC | Pass | State |
| 2025-03-05 | OHIO POWER PARTNERS, LLC | Pass | State |
| 2025-03-05 | OHIO POWER PARTNERS, LLC | Pass | State |
| 2025-03-05 | OHIO POWER PARTNERS, LLC | Pass | State |
| 2025-03-04 | OHIO POWER PARTNERS, LLC | Pass | State |
| 2025-03-04 | MIAMI UNIVERSITY | Pass | State |
| 2025-03-04 | MIAMI UNIVERSITY | Pass | State |
| 2025-01-23 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | Pass | State |
| 2025-01-23 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.