EPA Air · stack tests by county and year
Air-emissions stack tests in Butler County, Ohio, 2026
- 9Stack 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 2026. 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, 2026
Air-emissions stack tests in Butler County, other years
Air-emissions stack tests recorded in Butler County, Ohio, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-04-20 | MIDDLETOWN COKE COMPANY, LLC — high-priority violation on file | Pass | State |
| 2026-04-08 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | Pass | State |
| 2026-04-08 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | Pass | State |
| 2026-03-03 | OHIO POWER PARTNERS, LLC | Pass | State |
| 2026-02-16 | MIAMI UNIVERSITY | Pass | State |
| 2026-02-12 | MIAMI UNIVERSITY | Pass | State |
| 2026-02-12 | MIAMI UNIVERSITY | Pass | State |
| 2026-02-10 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | Pass | State |
| 2026-02-10 | CLEVELAND-CLIFFS STEEL CORPORATION — 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.