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 |
|---|---|---|---|---|
| 2026-03-27 | NORTHSTAR BLUESCOPE STEEL, LLC | DELTA, Fulton, OH | Pass | State |
| 2026-03-27 | NORTHSTAR BLUESCOPE STEEL, LLC | DELTA, Fulton, OH | Pass | State |
| 2026-03-27 | COLUMBIA GAS TRANSMISSION -D74 SOUTH MUDDY CREEK COMPRESSION | OAK HARBOR, Ottawa, OH | Pass | State |
| 2026-03-27 | COLUMBIA GAS TRANSMISSION -D74 SOUTH MUDDY CREEK COMPRESSION | OAK HARBOR, Ottawa, OH | Pass | State |
| 2026-03-27 | COLUMBIA GAS TRANSMISSION -D74 SOUTH MUDDY CREEK COMPRESSION | OAK HARBOR, Ottawa, OH | Pass | State |
| 2026-03-26 | DEPARTMENT OF PUBLIC UTILITIES, CITY OF ORRVILLE, OHIO | ORRVILLE, Wayne, OH | Pass | State |
| 2026-03-26 | COLUMBIA GAS TRANSMISSION -D74 SOUTH MUDDY CREEK COMPRESSION | OAK HARBOR, Ottawa, OH | Pass | State |
| 2026-03-26 | COLUMBIA GAS TRANSMISSION -D74 SOUTH MUDDY CREEK COMPRESSION | OAK HARBOR, Ottawa, OH | Pass | State |
| 2026-03-26 | COLUMBIA GAS TRANSMISSION -D74 SOUTH MUDDY CREEK COMPRESSION | OAK HARBOR, Ottawa, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - GRAND WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - GRAND WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - GRAND WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES -UTICA LLC - KUNGLE B N YRK BL WELLPAD | POWHATAN POINT, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES -UTICA LLC - KUNGLE B N YRK BL WELLPAD | POWHATAN POINT, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES -UTICA LLC - KUNGLE B N YRK BL WELLPAD | POWHATAN POINT, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - UTICA LLC - LAVADA RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - UTICA LLC - LAVADA RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - UTICA LLC - LAVADA RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES- UTICA, LLC - KURTH | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES- UTICA, LLC - KURTH | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES- UTICA, LLC - KURTH | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - COFFIELD RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - COFFIELD RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - COFFIELD RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - VICTORIA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - VICTORIA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - VICTORIA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | PURECYCLE OHIO, LLC. | IRONTON, Lawrence, OH | Pass | State |
| 2026-03-24 | PERFORMANCE MANUFACTURING CENTER | MARYSVILLE, Union, OH | Pass | State |
| 2026-03-24 | PERFORMANCE MANUFACTURING CENTER | MARYSVILLE, Union, OH | Pass | State |
| 2026-03-24 | PERFORMANCE MANUFACTURING CENTER | MARYSVILLE, Union, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - COOK UNIT WELL PAD | RICHLAND, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - COOK UNIT WELL PAD | RICHLAND, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - COOK UNIT WELL PAD | RICHLAND, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES-UTICA, LLC - ALPHA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES-UTICA, LLC - ALPHA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES-UTICA, LLC - ALPHA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - SHEPORGI GRN HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - SHEPORGI GRN HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - SHEPORGI GRN HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - CLUB SMF JF | ADENA, Jefferson, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - CLUB SMF JF | ADENA, Jefferson, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - CLUB SMF JF | ADENA, Jefferson, OH | Pass | State |
| 2026-03-24 | RANDALL PAD 952760 | SARDIS, Monroe, OH | Pass | State |
| 2026-03-24 | RANDALL PAD 952760 | SARDIS, Monroe, OH | Pass | State |
| 2026-03-24 | RANDALL PAD 952760 | SARDIS, Monroe, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | DARLING INGREDIENTS INC. (DBA BAKERY FEEDS) | NORTH BALTIMORE, Wood, OH | Pass | State |
| 2026-03-20 | DARLING INGREDIENTS INC. (DBA BAKERY FEEDS) | NORTH BALTIMORE, Wood, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.