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 |
|---|---|---|---|---|
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | POET BIOREFINING - LEIPSIC — high-priority violation on file | LEIPSIC, Putnam, OH | Fail | State |
| 2026-05-07 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-07 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | ROVER PIPELINE - DEFIANCE COMPRESSOR STATION | DEFIANCE, Defiance, OH | Pass | State |
| 2026-05-06 | POET BIOREFINING - LEIPSIC — high-priority violation on file | LEIPSIC, Putnam, OH | Fail | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-05 | ROVER PIPELINE - DEFIANCE COMPRESSOR STATION | DEFIANCE, Defiance, OH | Pass | State |
| 2026-05-05 | POET BIOREFINING - LEIPSIC — high-priority violation on file | LEIPSIC, Putnam, OH | Pass | State |
| 2026-05-05 | COLUMBIA PIPELINE GROUP-OAK HILL COMPRESSOR STATION | MADISON, TOWNSHIP OF, Jackson, OH | Pass | State |
| 2026-05-05 | COLUMBIA PIPELINE GROUP-OAK HILL COMPRESSOR STATION | MADISON, TOWNSHIP OF, Jackson, OH | Pass | State |
| 2026-05-05 | COLUMBIA PIPELINE GROUP-OAK HILL COMPRESSOR STATION | MADISON, TOWNSHIP OF, Jackson, OH | Pass | State |
| 2026-05-04 | ROVER PIPELINE - DEFIANCE COMPRESSOR STATION | DEFIANCE, Defiance, OH | Pass | State |
| 2026-05-04 | ROVER PIPELINE - DEFIANCE COMPRESSOR STATION | DEFIANCE, Defiance, OH | Pass | State |
| 2026-05-02 | ELLWOOD ENGINEERED CASTINGS | HUBBARD, Trumbull, OH | Pass | State |
| 2026-05-02 | ELLWOOD ENGINEERED CASTINGS | HUBBARD, Trumbull, OH | Pass | State |
| 2026-05-02 | ELLWOOD ENGINEERED CASTINGS | HUBBARD, Trumbull, OH | Pass | State |
| 2026-05-02 | ELLWOOD ENGINEERED CASTINGS | HUBBARD, Trumbull, OH | Pass | State |
| 2026-05-02 | ELLWOOD ENGINEERED CASTINGS | HUBBARD, Trumbull, OH | Pass | State |
| 2026-05-02 | ELLWOOD ENGINEERED CASTINGS | HUBBARD, Trumbull, OH | Pass | State |
| 2026-05-02 | ELLWOOD ENGINEERED CASTINGS | HUBBARD, Trumbull, OH | Pass | State |
| 2026-05-02 | ELLWOOD ENGINEERED CASTINGS | HUBBARD, Trumbull, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | MARKWEST YODER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-05-01 | BOYAS EXCAVATING, INC. | VALLEY VIEW, Cuyahoga, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Fail | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Fail | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Fail | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Fail | State |
| 2026-04-30 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-04-30 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-04-30 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-04-30 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-04-30 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-04-30 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-04-30 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-04-30 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-04-30 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-04-30 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.