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 |
|---|---|---|---|---|
| 2025-08-21 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-08-21 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-08-21 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-08-21 | PPG - SOUTH PLANT — high-priority violation on file | BARBERTON, Summit, OH | Fail | State |
| 2025-08-20 | EQM OLYMPUS MIDSTREAM, LLC - EMPIRE COMPRESSOR STATION | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-08-20 | EQM OLYMPUS MIDSTREAM, LLC - EMPIRE COMPRESSOR STATION | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-08-20 | EQM OLYMPUS MIDSTREAM, LLC - EMPIRE COMPRESSOR STATION | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-08-20 | EOG RESOURCES INC - SABLE CTB | CUMBERLAND, Guernsey, OH | Pass | State |
| 2025-08-20 | EOG RESOURCES INC - SABLE CTB | CUMBERLAND, Guernsey, OH | Pass | State |
| 2025-08-20 | EOG RESOURCES INC - SABLE CTB | CUMBERLAND, Guernsey, OH | Pass | State |
| 2025-08-20 | EOG RESOURCES INC - GAMBIT CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-08-20 | EOG RESOURCES INC - GAMBIT CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-08-20 | EOG RESOURCES INC - GAMBIT CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-08-20 | ASCENT RESOURCES - UTICA LLC - BOUSKA FRE HR | FREEPORT, Harrison, OH | Pass | State |
| 2025-08-20 | ASCENT RESOURCES - UTICA LLC - BOUSKA FRE HR | FREEPORT, Harrison, OH | Pass | State |
| 2025-08-20 | ASCENT RESOURCES - UTICA LLC - BOUSKA FRE HR | FREEPORT, Harrison, OH | Pass | State |
| 2025-08-20 | ASCENT RESOURCES - UTICA LLC - BOUSKA FRE HR | FREEPORT, Harrison, OH | Pass | State |
| 2025-08-19 | EOG RESOURCES, INC. - KITZMILLER CL KNX PAD | SALEM, Columbiana, OH | Pass | State |
| 2025-08-19 | EOG RESOURCES, INC. - KITZMILLER CL KNX PAD | SALEM, Columbiana, OH | Pass | State |
| 2025-08-19 | EOG RESOURCES, INC. - KITZMILLER CL KNX PAD | SALEM, Columbiana, OH | Pass | State |
| 2025-08-19 | DE NORA TECH MANUFACTURING FACILITY | MENTOR, Lake, OH | Pass | State |
| 2025-08-19 | DE NORA TECH MANUFACTURING FACILITY | MENTOR, Lake, OH | Pass | State |
| 2025-08-19 | DE NORA TECH MANUFACTURING FACILITY | MENTOR, Lake, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-08-19 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-08-19 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-08-18 | KOKOSING MATERIALS, INC. - PLANT NO 530 | COLUMBIA, TOWNSHIP OF, Lorain, OH | Pass | State |
| 2025-08-18 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-08-18 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-08-18 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-08-18 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-08-18 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-08-18 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-08-15 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | FAIRFIELD, Butler, OH | Pass | State |
| 2025-08-15 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | FAIRFIELD, Butler, OH | Pass | State |
| 2025-08-14 | PINNACLE GAS PRODUCERS LLC | MORAINE, Montgomery, OH | Pass | State |
| 2025-08-14 | PINNACLE GAS PRODUCERS LLC | MORAINE, Montgomery, OH | Pass | State |
| 2025-08-14 | PINNACLE GAS PRODUCERS LLC | MORAINE, Montgomery, OH | Pass | State |
| 2025-08-14 | MEDINA COMPRESSOR STATION | MEDINA, Medina, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-13 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-08-12 | MAR-ZANE PLANT NO 2 | MARIETTA, Washington, OH | Pass | State |
| 2025-08-12 | PATHEON PHARMACEUTICALS INC. | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-08-11 | POSEY PAD 952746 | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-08-11 | POSEY PAD 952746 | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-08-11 | POSEY PAD 952746 | QUAKER CITY, Guernsey, OH | Pass | State |
| 2025-08-08 | EOG RESOURCES, INC. - FOLSAM CR HAR PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2025-08-08 | EOG RESOURCES, INC. - FOLSAM CR HAR PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2025-08-08 | EOG RESOURCES, INC. - FOLSAM CR HAR PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2025-08-08 | GULFPORT APPALACHIA, LLC - KAGE PAD | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-08-08 | GULFPORT APPALACHIA, LLC - KAGE PAD | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-08-08 | GULFPORT APPALACHIA, LLC - KAGE PAD | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-08-07 | EOG RESOURCES, INC. - ADDY 9-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2025-08-07 | EOG RESOURCES, INC. - ADDY 9-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2025-08-07 | MAR ZANE PLANT NO 4 | HAYDENVILLE, Hocking, OH | Pass | State |
| 2025-08-06 | ERIE MATERIALS INC. | SANDUSKY, Erie, OH | Pass | State |
| 2025-08-06 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-08-06 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-08-06 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-08-05 | EOG RESOURCES, INC. - WIANDT 12-13-6 PAD | LEESVILLE, Carroll, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-08-05 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.