EPA Air · stack tests by state and year
Air-emissions stack tests in Ohio, 2025
- 2,213Stack 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 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Ohio, 2025
- Monroe County 233
- Belmont County 210
- Lucas County 209
- Harrison County 199
- Carroll County 138
- Jefferson County 121
- Guernsey County 95
- Noble County 84
- Montgomery County 68
- Defiance County 65
- Franklin County 61
- Hamilton County 58
- Medina County 43
- Undetermined County 42
- Butler County 34
- Putnam County 34
- Stark County 33
- Lorain County 31
- Columbiana County 27
- Wood County 26
- Cuyahoga County 25
- Trumbull County 24
- Mahoning County 23
- Perry County 23
- Marion County 20
- Tuscarawas County 20
- Fairfield County 18
- Licking County 17
- Crawford County 16
- Greene County 15
- Union County 15
- Ashtabula County 14
- Darke County 12
- Washington County 12
- Williams County 12
- Allen County 11
- Wayne County 10
- Brown County 9
- Miami County 9
- Summit County 9
- Warren County 8
- Richland County 7
- Clark County 6
- Huron County 6
- Athens County 5
- Muskingum County 5
- Erie County 5
- Van Wert County 4
- Hancock County 4
- Delaware County 3
- Shelby County 3
- Portage County 3
- Coshocton County 3
- Lake County 3
- Jackson County 3
Ohio, other years
Air-emissions stack tests recorded in Ohio, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-21 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-21 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-21 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-21 | GULFPORT APPALACHIA, LLC - ROBINETTE | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-11-21 | GULFPORT APPALACHIA, LLC - ROBINETTE | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-11-21 | GULFPORT APPALACHIA, LLC - ROBINETTE | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-11-21 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2025-11-21 | C&D WASTE SOLUTIONS, LLC — high-priority violation on file | CANTON, Stark, OH | Pass | State |
| 2025-11-20 | ASCENT RESOURCES - UTICA LLC - OMAITS SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-11-20 | ASCENT RESOURCES - UTICA LLC - OMAITS SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-11-20 | ASCENT RESOURCES - UTICA LLC - OMAITS SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-11-20 | GULFPORT APPALACHIA, LLC - KINYO PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-11-20 | GULFPORT APPALACHIA, LLC - KINYO PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-11-20 | GULFPORT APPALACHIA, LLC - KINYO PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-11-20 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-11-19 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2025-11-19 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2025-11-19 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2025-11-19 | BLUE RACER MIDSTREAM LLC - BELMONT CO FIELD STATION #1 | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | BLUE RACER MIDSTREAM LLC - BELMONT CO FIELD STATION #1 | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | BLUE RACER MIDSTREAM LLC - BELMONT CO FIELD STATION #1 | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - ALBERT KKW BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - ALBERT KKW BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - ALBERT KKW BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - MALDON WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - MALDON WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - MALDON WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | EQM OLYMPUS MIDSTREAM, LLC - CATAPULT CS | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-11-19 | EQM OLYMPUS MIDSTREAM, LLC - CATAPULT CS | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-11-19 | EQM OLYMPUS MIDSTREAM, LLC - CATAPULT CS | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES-UTICA, LLC - BROWN WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES-UTICA, LLC - BROWN WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES-UTICA, LLC - BROWN WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-11-19 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-11-18 | HILCORP ENERGY - POLAND-CLL PRODUCTION FACILITY | POLAND, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2025-11-18 | HILCORP ENERGY - POLAND-CLL PRODUCTION FACILITY | POLAND, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2025-11-18 | HILCORP ENERGY - POLAND-CLL PRODUCTION FACILITY | POLAND, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - WHEELING VALLEY WHL BL | MAYNARD, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - WHEELING VALLEY WHL BL | MAYNARD, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - WHEELING VALLEY WHL BL | MAYNARD, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | BLUE RACER MIDSTREAM LLC - NOBLE CO FIELD STATION #1 | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-11-18 | BLUE RACER MIDSTREAM LLC - NOBLE CO FIELD STATION #1 | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-11-18 | BLUE RACER MIDSTREAM LLC - NOBLE CO FIELD STATION #1 | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-11-18 | TAIT ELECTRIC GENERATING STATION | MORAINE, Montgomery, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - JENNINGS WLS GR | LORE CITY, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - JENNINGS WLS GR | LORE CITY, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - JENNINGS WLS GR | LORE CITY, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - SLABAUGH RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - SLABAUGH RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - SLABAUGH RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-11-15 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-15 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-15 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-13 | GULFPORT APPALACHIA, LLC - HOWELL | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-11-13 | GULFPORT APPALACHIA, LLC - HOWELL | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-11-13 | GULFPORT APPALACHIA, LLC - HOWELL | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-11-13 | ROCKIES EXPRESS PIPELINE LLC- CHANDLERSVILLE CS | PHILO, Muskingum, OH | Pass | State |
| 2025-11-13 | MIAMI FORT POWER COMPANY LLC | NORTH BEND, Hamilton, OH | Pass | State |
| 2025-11-12 | PILKINGTON NORTH AMERICA INC — high-priority violation on file | ROSSFORD, Wood, OH | Pass | State |
| 2025-11-12 | PILKINGTON NORTH AMERICA INC — high-priority violation on file | ROSSFORD, Wood, OH | Pass | State |
| 2025-11-12 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-12 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-12 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-12 | EOG RESOURCES, INC. - TYGERS GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-12 | EOG RESOURCES, INC. - TYGERS GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | MIDDLETOWN COKE COMPANY, LLC — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.