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 |
|---|---|---|---|---|
| 2025-12-30 | EMERSON BELLE OHI -UTICA PAD 1 952455 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-12-30 | EMERSON BELLE OHI -UTICA PAD 1 952455 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-12-30 | EMERSON BELLE OHI -UTICA PAD 1 952455 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-12-27 | CINCINNATI CHILDREN'S HOSPITAL MEDICAL CENTER | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-12-27 | CINCINNATI CHILDREN'S HOSPITAL MEDICAL CENTER | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-12-27 | CINCINNATI CHILDREN'S HOSPITAL MEDICAL CENTER | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-12-20 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-20 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-19 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-19 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | LSC COMMUNICATIONS BOOK, WILLARD | WILLARD, Huron, OH | Pass | State |
| 2025-12-18 | OSCO INC.-JACKSON DIVISION | JACKSON, Jackson, OH | Pass | State |
| 2025-12-18 | APEX LFG ENERGY, LLC | AMSTERDAM, Jefferson, OH | Pass | State |
| 2025-12-18 | APEX LFG ENERGY, LLC | AMSTERDAM, Jefferson, OH | Pass | State |
| 2025-12-18 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-18 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-18 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-18 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GRYWALSKI MTP JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GRYWALSKI MTP JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GRYWALSKI MTP JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GIUSTO CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GIUSTO CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GIUSTO CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-12-16 | PEPPERIDGE FARM INC. | WILLARD, Huron, OH | Fail | State |
| 2025-12-16 | GULFPORT APPALACHIA, LLC - SUNSET WELL PAD | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-12-16 | GULFPORT APPALACHIA, LLC - SUNSET WELL PAD | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-12-16 | GULFPORT APPALACHIA, LLC - SUNSET WELL PAD | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - ZIMNOX WLS JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - ZIMNOX WLS JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - ZIMNOX WLS JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - DOYEN WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - DOYEN WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - DOYEN WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-15 | ASCENT RESOURCES - UTICA LLC - DAWSON SMF JF WELLPAD | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-15 | ASCENT RESOURCES - UTICA LLC - DAWSON SMF JF WELLPAD | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-15 | ASCENT RESOURCES - UTICA LLC - DAWSON SMF JF WELLPAD | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - LEE CLR BL WELLPAD | BRIDGEPORT, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - LEE CLR BL WELLPAD | BRIDGEPORT, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - LEE CLR BL WELLPAD | BRIDGEPORT, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - BAKOS CLR BI | COLERAIN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - BAKOS CLR BI | COLERAIN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - BAKOS CLR BI | COLERAIN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - PHILLIPS MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - PHILLIPS MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - PHILLIPS MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA LLC - KALDOR UNIT 1H | MEAD, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA LLC - KALDOR UNIT 1H | MEAD, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA LLC - KALDOR UNIT 1H | MEAD, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-11 | THREE RIVERS ENERGY, LLC | COSHOCTON, Coshocton, OH | Pass | State |
| 2025-12-11 | THREE RIVERS ENERGY, LLC | COSHOCTON, Coshocton, OH | Pass | State |
| 2025-12-11 | THREE RIVERS ENERGY, LLC | COSHOCTON, Coshocton, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | PROCTER & GAMBLE MASON BUSINESS & INNOVATION CENTER | MASON, Warren, 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.