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 |
|---|---|---|---|---|
| 2025-09-10 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-09-10 | CROWN CORK & SEAL - MASSILLON PLANT 42 | MASSILLON, Stark, OH | Pass | State |
| 2025-09-09 | HERRICK PAD 952535 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-09 | HERRICK PAD 952535 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-09 | HERRICK PAD 952535 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-09 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-09 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-09 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-09 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-09-08 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-05 | TRAILWAY WOOD II | DUNDEE, Tuscarawas, OH | Pass | State |
| 2025-09-05 | TRAILWAY WOOD II | DUNDEE, Tuscarawas, OH | Pass | State |
| 2025-09-05 | TRAILWAY WOOD II | DUNDEE, Tuscarawas, OH | Pass | State |
| 2025-09-05 | TRAILWAY WOOD II | DUNDEE, Tuscarawas, OH | Pass | State |
| 2025-09-05 | TRAILWAY WOOD II | DUNDEE, Tuscarawas, OH | Pass | State |
| 2025-09-05 | TRAILWAY WOOD II | DUNDEE, Tuscarawas, OH | Pass | State |
| 2025-09-04 | EOG RESOURCES, INC. - HN STO 26 12-11-6 SOUTH PAD | CADIZ, Harrison, OH | Pass | State |
| 2025-09-04 | EOG RESOURCES, INC. - HN STO 26 12-11-6 SOUTH PAD | CADIZ, Harrison, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-04 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-03 | TRIAD HUNTER LLC - FORNI PAD | BENTON, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2025-09-03 | TRIAD HUNTER LLC - FORNI PAD | BENTON, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2025-09-03 | TRIAD HUNTER LLC - FORNI PAD | BENTON, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2025-09-03 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-03 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-03 | DIVERSIFIED PRODUCTION LLC - MOONRAKER PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-03 | DIVERSIFIED PRODUCTION LLC - MOONRAKER PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-03 | DIVERSIFIED PRODUCTION LLC - MOONRAKER PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-02 | BLUE RACER MIDSTREAM LLC - HFS#1 (CADIZ B) | CADIZ, Harrison, OH | Pass | State |
| 2025-09-02 | BLUE RACER MIDSTREAM LLC - HFS#1 (CADIZ B) | CADIZ, Harrison, OH | Pass | State |
| 2025-09-02 | BLUE RACER MIDSTREAM LLC - HFS#1 (CADIZ B) | CADIZ, Harrison, OH | Pass | State |
| 2025-09-02 | PEAVINE PAD 952737 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-02 | PEAVINE PAD 952737 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-02 | PEAVINE PAD 952737 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-02 | GM CEREALS PROPERTIES, INC. | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-09-02 | GM CEREALS PROPERTIES, INC. | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-08-29 | EOG RESOURCES, INC. - WAGNER GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-08-29 | EOG RESOURCES, INC. - WAGNER GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-08-29 | EOG RESOURCES, INC. - WAGNER GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-08-29 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-08-29 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-08-29 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-08-28 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Fail | State |
| 2025-08-28 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Fail | State |
| 2025-08-28 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-08-28 | BUCYRUS ROAD MATERIALS | BUCYRUS, Crawford, OH | Pass | State |
| 2025-08-28 | ASCENT RESOURCES - UTICA LLC - MATUSEK WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-08-28 | ASCENT RESOURCES - UTICA LLC - MATUSEK WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-08-28 | ASCENT RESOURCES - UTICA LLC - MATUSEK WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-08-27 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-08-27 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-08-27 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-08-27 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-08-27 | ROVER PIPELINE - MAINLINE CS2 | WOOSTER, Wayne, OH | Pass | State |
| 2025-08-27 | ROVER PIPELINE - MAINLINE CS2 | WOOSTER, Wayne, OH | Pass | State |
| 2025-08-27 | ROVER PIPELINE - MAINLINE CS2 | WOOSTER, Wayne, OH | Pass | State |
| 2025-08-27 | ROVER PIPELINE - MAINLINE CS2 | WOOSTER, Wayne, OH | Pass | State |
| 2025-08-27 | ROVER PIPELINE - MAINLINE CS2 | WOOSTER, Wayne, OH | Pass | State |
| 2025-08-27 | ROVER PIPELINE - MAINLINE CS2 | WOOSTER, Wayne, OH | Pass | State |
| 2025-08-27 | HONDA DEV. & MFG. OF AMERICA, LLC, EAST LIBERTY PLANT | EAST LIBERTY, Logan, OH | Pass | State |
| 2025-08-27 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-08-27 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-08-27 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-08-26 | S.W. ALFALFA MILLS INC. | ARCHBOLD, Fulton, OH | Pass | State |
| 2025-08-26 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2025-08-26 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2025-08-26 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2025-08-26 | ASCENT RESOURCES - UTICA, LLC - WASSMANN | BELLAIRE, Belmont, OH | Pass | State |
| 2025-08-26 | ASCENT RESOURCES - UTICA, LLC - WASSMANN | BELLAIRE, Belmont, OH | Pass | State |
| 2025-08-26 | ASCENT RESOURCES - UTICA, LLC - WASSMANN | BELLAIRE, Belmont, OH | Pass | State |
| 2025-08-26 | BARRETT PAVING - RIVER RD ASPHALT | SIDNEY, Shelby, OH | Pass | State |
| 2025-08-26 | BARRETT PAVING - RIVER RD ASPHALT | SIDNEY, Shelby, OH | Pass | State |
| 2025-08-26 | MIAMI FORT POWER COMPANY LLC | NORTH BEND, Hamilton, OH | Pass | State |
| 2025-08-25 | EOG RESOURCES, INC. - TOWE 29-12-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2025-08-25 | EOG RESOURCES, INC. - TOWE 29-12-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2025-08-25 | EOG RESOURCES, INC. - TOWE 29-12-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2025-08-25 | EOG RESOURCES, INC. - CONKLIN 34-13-7 PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2025-08-25 | EOG RESOURCES, INC. - CONKLIN 34-13-7 PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2025-08-25 | EOG RESOURCES, INC. - CONKLIN 34-13-7 PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2025-08-24 | GUERNSEY POWER STATION LLC | BYESVILLE, Guernsey, OH | Pass | State |
| 2025-08-24 | GUERNSEY POWER STATION LLC | BYESVILLE, Guernsey, OH | Pass | State |
| 2025-08-24 | GUERNSEY POWER STATION LLC | BYESVILLE, Guernsey, OH | Pass | State |
| 2025-08-21 | EQM OLYMPUS MIDSTREAM LLC - LONESTAR COMPRESSOR STATION | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-08-21 | EQM OLYMPUS MIDSTREAM LLC - LONESTAR COMPRESSOR STATION | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-08-21 | EQM OLYMPUS MIDSTREAM LLC - LONESTAR COMPRESSOR STATION | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.