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 |
|---|---|---|---|---|
| 2026-08-19 | SAWYERS PAD 952878 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | SAWYERS PAD 952878 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | SAWYERS PAD 952878 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-11 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2026-08-11 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2026-08-11 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2026-07-31 | PLYMOUTH FOAM, LLC | NEWCOMERSTOWN, Tuscarawas, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES - UTICA LLC - BANJO SHC HR | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES - UTICA LLC - BANJO SHC HR | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES - UTICA LLC - BANJO SHC HR | CADIZ, Harrison, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - KELPIE WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - KELPIE WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - KELPIE WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - WATKINS CR MON PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - WATKINS CR MON PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - WATKINS CR MON PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - SPROUL 20-13-7 PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - SPROUL 20-13-7 PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - SPROUL 20-13-7 PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - BORUM SMF JF | SMITHFIELD, TOWNSHIP OF, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - BORUM SMF JF | SMITHFIELD, TOWNSHIP OF, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - BORUM SMF JF | SMITHFIELD, TOWNSHIP OF, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - RONALD SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - RONALD SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - RONALD SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2026-07-22 | CROWN CORK & SEAL — high-priority violation on file | TOLEDO, Lucas, OH | Fail | State |
| 2026-07-22 | CROWN CORK & SEAL — high-priority violation on file | TOLEDO, Lucas, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - OLIVER CLR BL | MARTINS FERRY, Belmont, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - OLIVER CLR BL | MARTINS FERRY, Belmont, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - OLIVER CLR BL | MARTINS FERRY, Belmont, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - RECTOR MTP JF WELLPAD | ADENA, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - RECTOR MTP JF WELLPAD | ADENA, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - RECTOR MTP JF WELLPAD | ADENA, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - KIDD 21-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - KIDD 21-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - KIDD 21-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - BROOKFIELD CTB | CUMBERLAND, Guernsey, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - BROOKFIELD CTB | CUMBERLAND, Guernsey, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - BROOKFIELD CTB | CUMBERLAND, Guernsey, OH | Pass | State |
| 2026-07-21 | COLUMBIA PIPELINE GROUP-SUMMERFIELD | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-07-21 | COLUMBIA PIPELINE GROUP-SUMMERFIELD | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-07-17 | EOG RESOURCES, INC - INDIGO CTB | MALVERN, Carroll, OH | Pass | State |
| 2026-07-17 | EOG RESOURCES, INC - INDIGO CTB | MALVERN, Carroll, OH | Pass | State |
| 2026-07-17 | EOG RESOURCES, INC - INDIGO CTB | MALVERN, Carroll, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - E CLARK SOUTH CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - E CLARK SOUTH CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - E CLARK SOUTH CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - BEARCATS NB BUF PAD | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - BEARCATS NB BUF PAD | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - BEARCATS NB BUF PAD | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | ENVIRONMENTAL AND MAINTENANCE SERVICE CENTER (EMSC) | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-15 | EOG RESOURCES INC - CHEETAH CTB | CALDWELL, Noble, OH | Pass | State |
| 2026-07-15 | EOG RESOURCES INC - CHEETAH CTB | CALDWELL, Noble, OH | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.