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 |
|---|---|---|---|---|
| 2026-04-30 | 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 |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | OHIO RIVER SYSTEM LLC - REX BOOSTER STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-04-30 | EOG RESOURCES, INC - OSPREY CTB | CALDWELL, Noble, OH | Pass | State |
| 2026-04-30 | EOG RESOURCES, INC - OSPREY CTB | CALDWELL, Noble, OH | Pass | State |
| 2026-04-30 | EOG RESOURCES, INC - OSPREY CTB | CALDWELL, Noble, OH | Pass | State |
| 2026-04-30 | GE AEROSPACE EVENDALE PLANT | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-04-30 | GENERAL ALUMINUM | ROOTSTOWN, Portage, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - BLACKBIRD COMPRESSOR STATION | BROWN, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - FAIRFIELD-NOLKER PRODUCTION FACILITY | LEETONIA, Columbiana, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - FAIRFIELD-NOLKER PRODUCTION FACILITY | LEETONIA, Columbiana, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - ELK RUN AUER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - ELK RUN AUER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - ELK RUN AUER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-29 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PECKENS JN SAL 21-10-3 PAD | RICHMOND, Jefferson, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PECKENS JN SAL 21-10-3 PAD | RICHMOND, Jefferson, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PECKENS JN SAL 21-10-3 PAD | RICHMOND, Jefferson, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PEARLEY TC PER PAD | STILLWATER, Tuscarawas, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PEARLEY TC PER PAD | STILLWATER, Tuscarawas, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PEARLEY TC PER PAD | STILLWATER, Tuscarawas, OH | Pass | State |
| 2026-04-28 | HILCORP ENERGY - POLAND-CLL PRODUCTION FACILITY | POLAND, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-04-28 | HILCORP ENERGY - POLAND-CLL PRODUCTION FACILITY | POLAND, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-04-28 | HILCORP ENERGY - POLAND-CLL PRODUCTION FACILITY | POLAND, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-04-28 | MCWANE DUCTILE - OHIO | COSHOCTON, Coshocton, OH | Pass | State |
| 2026-04-28 | MCWANE DUCTILE - OHIO | COSHOCTON, Coshocton, OH | Pass | State |
| 2026-04-28 | MCWANE DUCTILE - OHIO | COSHOCTON, Coshocton, OH | Pass | State |
| 2026-04-28 | MCWANE DUCTILE - OHIO | COSHOCTON, Coshocton, OH | Pass | State |
| 2026-04-28 | MCWANE DUCTILE - OHIO | COSHOCTON, Coshocton, OH | Pass | State |
| 2026-04-28 | MCWANE DUCTILE - OHIO | COSHOCTON, Coshocton, OH | Pass | State |
| 2026-04-28 | MCWANE DUCTILE - OHIO | COSHOCTON, Coshocton, OH | Pass | State |
| 2026-04-28 | EOG RESOURCES, INC. - GUTHRIE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2026-04-28 | EOG RESOURCES, INC. - GUTHRIE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2026-04-28 | EOG RESOURCES, INC. - GUTHRIE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2026-04-28 | DTE MARIETTA | MARIETTA, Washington, OH | Pass | State |
| 2026-04-28 | GENERAL ALUMINUM | ROOTSTOWN, Portage, OH | Pass | State |
| 2026-04-23 | PLASKOLITE, LLC. | COLUMBUS, Franklin, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SEABRIGHT CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SEABRIGHT CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SEABRIGHT CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SMITH CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SMITH CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SMITH CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - OBOY CLR BL WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - OBOY CLR BL WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - OBOY CLR BL WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | HAVERHILL COKE COMPANY LLC — high-priority violation on file | FRANKLIN FURNACE, Scioto, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BOROVICH RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BOROVICH RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BOROVICH RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BLAYNEY WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BLAYNEY WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BLAYNEY WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | PLYMOUTH FOAM, LLC | NEWCOMERSTOWN, Tuscarawas, OH | Fail | State |
| 2026-04-21 | HILCORP ENERGY - ELK RUN WERTZ PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-21 | HILCORP ENERGY - ELK RUN WERTZ PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-21 | HILCORP ENERGY - ELK RUN WERTZ PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-21 | ASCENT RESOURCES - UTICA LLC - TARPLEY OXF GR | QUAKER CITY, Guernsey, OH | Pass | State |
| 2026-04-21 | ASCENT RESOURCES - UTICA LLC - TARPLEY OXF GR | QUAKER CITY, Guernsey, OH | Pass | State |
| 2026-04-21 | ASCENT RESOURCES - UTICA LLC - TARPLEY OXF GR | QUAKER CITY, Guernsey, OH | Pass | State |
| 2026-04-21 | EQM OLYMPUS MIDSTREAM, LLC - RIFLE COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.