EPA Air · stack tests by state and year
Air-emissions stack tests in Ohio, 2026
- 1,474Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Ohio during 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Ohio, 2026
- Belmont County 206
- Monroe County 168
- Harrison County 159
- Carroll County 104
- Lucas County 100
- Jefferson County 75
- Noble County 64
- Columbiana County 55
- Guernsey County 45
- Stark County 44
- Wayne County 28
- Mahoning County 28
- Fulton County 25
- Perry County 25
- Richland County 24
- Hamilton County 21
- Marion County 17
- Scioto County 15
- Greene County 15
- Muskingum County 15
- Tuscarawas County 15
- Crawford County 15
- Wood County 13
- Ashtabula County 12
- Brown County 11
- Wyandot County 11
- Butler County 9
- Seneca County 9
- Trumbull County 9
- Cuyahoga County 8
- Defiance County 8
- Lake County 8
- Ottawa County 8
- Washington County 7
- Coshocton County 7
- Pickaway County 7
- Union County 7
- Miami County 6
- Montgomery County 6
- Erie County 6
- Darke County 6
- Shelby County 5
- Undetermined County 5
- Franklin County 4
- Summit County 4
- Portage County 4
- Putnam County 3
- Holmes County 3
- Fayette County 3
- Licking County 3
- Jackson County 3
Ohio, other years
Air-emissions stack tests recorded in Ohio, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Pass | State |
| 2026-03-19 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Fail | State |
| 2026-03-19 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Pass | State |
| 2026-03-19 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Pass | State |
| 2026-03-18 | OWENS CORNING INSULATING SYSTEMS, LLC | NEWARK, Licking, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-SCHEEL PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-SCHEEL PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-SCHEEL PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-FAIRMONT PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-FAIRMONT PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-FAIRMONT PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-03-18 | CARGILL, INC. - DAYTON | DAYTON, Montgomery, OH | Pass | State |
| 2026-03-18 | CARGILL, INC. - DAYTON | DAYTON, Montgomery, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | CARGILL, INC. - DAYTON | DAYTON, Montgomery, OH | Pass | State |
| 2026-03-17 | CARGILL, INC. - DAYTON | DAYTON, Montgomery, OH | Pass | State |
| 2026-03-13 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2026-03-13 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2026-03-13 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2026-03-12 | PPG ADVANCED SURFACE TECHNOLOGIES, LLC | OHIO, Undetermined, OH | Pass | State |
| 2026-03-12 | PPG ADVANCED SURFACE TECHNOLOGIES, LLC | OHIO, Undetermined, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST HARRISON WEST COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | MARKWEST LAKE COMPRESSOR STATION | FREEPORT, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
| 2026-03-12 | UTICA GAS SERVICES, LLC - SCIO COMPRESSOR STATION | SCIO, Harrison, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.