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 |
|---|---|---|---|---|
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-10 | TEXAS EASTERN TRANSMISSIONS L.P. - SOMERSET | SOMERSET, Perry, OH | Pass | State |
| 2025-11-10 | TEXAS EASTERN TRANSMISSIONS L.P. - SOMERSET | SOMERSET, Perry, OH | Pass | State |
| 2025-11-07 | CARBON LIMESTONE SANITARY LANDFILL | LOWELLVILLE, Mahoning, OH | Pass | State |
| 2025-11-07 | CARBON LIMESTONE SANITARY LANDFILL | LOWELLVILLE, Mahoning, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | CHARLES F. JERGENS CONSTRUCTION INC. PORTABLE | DAYTON, Montgomery, OH | Pass | State |
| 2025-11-05 | CHROME DEPOSIT CORP. | AKRON, Summit, OH | Pass | State |
| 2025-11-04 | SHELLY MATERIALS PLANT # 4132 — high-priority violation on file | TOLEDO, Lucas, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-11-04 | BLUE RACER MIDSTREAM, LLC - BORTON STATION | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-10-29 | LIBERTY CASTING INC. — high-priority violation on file | DELAWARE, Delaware, OH | Pass | State |
| 2025-10-29 | LIBERTY CASTING INC. — high-priority violation on file | DELAWARE, Delaware, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | RICE DRILLING D LLC - DANGEL PAD | SARDIS, Monroe, OH | Pass | State |
| 2025-10-29 | RICE DRILLING D LLC - DANGEL PAD | SARDIS, Monroe, OH | Pass | State |
| 2025-10-29 | RICE DRILLING D LLC - DANGEL PAD | SARDIS, Monroe, OH | Pass | State |
| 2025-10-29 | MORIROKU TECHNOLOGY NORTH AMERICA - GREENVILLE | GREENVILLE, Darke, OH | Pass | State |
| 2025-10-29 | MORIROKU TECHNOLOGY NORTH AMERICA - GREENVILLE | GREENVILLE, Darke, OH | Pass | State |
| 2025-10-29 | UNIVERSITY OF CINCINNATI | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-10-29 | UNIVERSITY OF CINCINNATI | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-10-29 | UNIVERSITY OF CINCINNATI | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-10-29 | UNIVERSITY OF CINCINNATI | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - SHC ENTERPRISES 32-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - SHC ENTERPRISES 32-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - SHC ENTERPRISES 32-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - GUTHRIE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - GUTHRIE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - GUTHRIE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2025-10-24 | MATALCO USA LLC | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-10-24 | MATALCO USA LLC | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-10-24 | MATALCO USA LLC | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-10-23 | ROSS INCINERATION SERVICES, INC. | GRAFTON, Lorain, OH | Pass | State |
| 2025-10-23 | ROSS INCINERATION SERVICES, INC. | GRAFTON, Lorain, OH | Pass | State |
| 2025-10-23 | MCINTIRE NORTH PAD 952640 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-23 | MCINTIRE NORTH PAD 952640 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-23 | MCINTIRE NORTH PAD 952640 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-23 | ELCO CORP. — high-priority violation on file | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2025-10-23 | ELCO CORP. — high-priority violation on file | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2025-10-22 | SCIOTO MATERIALS LLC | COLUMBUS, Franklin, OH | Pass | State |
| 2025-10-22 | SCIOTO MATERIALS LLC | COLUMBUS, Franklin, OH | Pass | State |
| 2025-10-22 | SCIOTO MATERIALS LLC | COLUMBUS, Franklin, OH | Pass | State |
| 2025-10-22 | EOG RESOURCES, INC. - BEARS NB BUF PAD | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-10-22 | EOG RESOURCES, INC. - BEARS NB BUF PAD | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-10-22 | EOG RESOURCES, INC. - BEARS NB BUF PAD | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-10-22 | ELCO CORP. — high-priority violation on file | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-20 | SUMMIT COUNTY ENGINEER NORTH STATION — high-priority violation on file | PENINSULA, Summit, OH | Pass | State |
| 2025-10-16 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2025-10-16 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2025-10-16 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.