EPA Air · stack tests by state and year
Air-emissions stack tests in Ohio, 2026
- 1,474Stack 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 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Ohio, 2026
- Belmont County 206
- Monroe County 168
- Harrison County 159
- Carroll County 104
- Lucas County 100
- Jefferson County 75
- Noble County 64
- Columbiana County 55
- Guernsey County 45
- Stark County 44
- Wayne County 28
- Mahoning County 28
- Fulton County 25
- Perry County 25
- Richland County 24
- Hamilton County 21
- Marion County 17
- Scioto County 15
- Greene County 15
- Muskingum County 15
- Tuscarawas County 15
- Crawford County 15
- Wood County 13
- Ashtabula County 12
- Brown County 11
- Wyandot County 11
- Butler County 9
- Seneca County 9
- Trumbull County 9
- Cuyahoga County 8
- Defiance County 8
- Lake County 8
- Ottawa County 8
- Washington County 7
- Coshocton County 7
- Pickaway County 7
- Union County 7
- Miami County 6
- Montgomery County 6
- Erie County 6
- Darke County 6
- Shelby County 5
- Undetermined County 5
- Franklin County 4
- Summit County 4
- Portage County 4
- Putnam County 3
- Holmes County 3
- Fayette County 3
- Licking County 3
- Jackson County 3
Ohio, other years
Air-emissions stack tests recorded in Ohio, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2026-02-10 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2026-02-05 | EOG RESOURCES, INC. - WIANDT 12-13-6 PAD | LEESVILLE, Carroll, OH | Pass | State |
| 2026-02-05 | MIAMI FORT POWER COMPANY LLC | NORTH BEND, Hamilton, OH | Pass | State |
| 2026-02-04 | ANCHOR HOCKING, LLC | LANCASTER, Fairfield, OH | Pass | State |
| 2026-02-04 | EOG RESOURCES, INC. - BOWLING 23-16-6 PAD | MALVERN, Carroll, OH | Pass | State |
| 2026-02-04 | EOG RESOURCES, INC. - BOWLING 23-16-6 PAD | MALVERN, Carroll, OH | Pass | State |
| 2026-02-04 | EOG RESOURCES, INC. - BOWLING 23-16-6 PAD | MALVERN, Carroll, OH | Pass | State |
| 2026-02-04 | CITY OF AKRON STEAM GENERATING | AKRON, Summit, OH | Pass | State |
| 2026-02-03 | EOG RESOURCES, INC. - KOVACH 3-15-6 PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-02-03 | EOG RESOURCES, INC. - KOVACH 3-15-6 PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-02-03 | EOG RESOURCES, INC. - KOVACH 3-15-6 PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-02-03 | FULTON COUNTY PROCESSING | DELTA, Fulton, OH | Pass | State |
| 2026-02-03 | PPG INDUSTRIES OHIO, INC. | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2026-02-03 | CITY OF AKRON STEAM GENERATING | AKRON, Summit, OH | Pass | State |
| 2026-02-03 | CITY OF AKRON STEAM GENERATING | AKRON, Summit, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - KENNETH LLOYD 5-14-7 PAD | LEESVILLE, Carroll, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - KENNETH LLOYD 5-14-7 PAD | LEESVILLE, Carroll, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - KENNETH LLOYD 5-14-7 PAD | LEESVILLE, Carroll, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - BOWERSTON 21-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - BOWERSTON 21-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - BOWERSTON 21-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2026-01-29 | PEPPERIDGE FARM INC. | WILLARD, Huron, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | FCA US LLC - TOLEDO NORTH ASSEMBLY | TOLEDO, Lucas, OH | Pass | State |
| 2026-01-28 | IVEX PROTECTIVE PACKAGING, LLC | SIDNEY, Shelby, OH | Pass | State |
| 2026-01-28 | IVEX PROTECTIVE PACKAGING, LLC | SIDNEY, Shelby, OH | Pass | State |
| 2026-01-28 | IVEX PROTECTIVE PACKAGING, LLC | SIDNEY, Shelby, OH | Pass | State |
| 2026-01-28 | IVEX PROTECTIVE PACKAGING, LLC | SIDNEY, Shelby, OH | Pass | State |
| 2026-01-28 | EQUITRANS LP - PLASMA COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2026-01-28 | EQUITRANS LP - PLASMA COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2026-01-28 | EQUITRANS LP - PLASMA COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2026-01-28 | EASTERN GAS TRANSMISSION AND STORAGE - LEBANON STATION | LEBANON, Warren, OH | Pass | State |
| 2026-01-23 | BAIRD BROTHERS SAWMILL INC — high-priority violation on file | CANFIELD, Mahoning, OH | Pass | State |
| 2026-01-23 | BAIRD BROTHERS SAWMILL INC — high-priority violation on file | CANFIELD, Mahoning, OH | Pass | State |
| 2026-01-23 | BAIRD BROTHERS SAWMILL INC — high-priority violation on file | CANFIELD, Mahoning, OH | Pass | State |
| 2026-01-23 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2026-01-23 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2026-01-23 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2026-01-23 | EOG RESOURCES, INC. - BEARS NB BUF PAD | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-01-23 | EOG RESOURCES, INC. - BEARS NB BUF PAD | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-01-22 | H W CHAIR, LTD | MILLERSBURG, Holmes, OH | Pass | State |
| 2026-01-22 | H W CHAIR, LTD | MILLERSBURG, Holmes, OH | Pass | State |
| 2026-01-22 | H W CHAIR, LTD | MILLERSBURG, Holmes, OH | Pass | State |
| 2026-01-21 | EOG RESOURCES, INC. - VANFOSSEN CR AUG PAD | AUGUSTA, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-01-21 | EOG RESOURCES, INC. - VANFOSSEN CR AUG PAD | AUGUSTA, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-01-21 | EOG RESOURCES, INC. - VANFOSSEN CR AUG PAD | AUGUSTA, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-01-21 | DAISY BRAND LLC | WOOSTER, Wayne, OH | Pass | State |
| 2026-01-21 | DAISY BRAND LLC | WOOSTER, Wayne, OH | Pass | State |
| 2026-01-21 | DAISY BRAND LLC | WOOSTER, Wayne, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-20 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2026-01-19 | MARKWEST - CADIZ GAS PLANT | CADIZ, Harrison, OH | Pass | State |
| 2026-01-19 | MARKWEST - CADIZ GAS PLANT | CADIZ, Harrison, OH | Pass | State |
| 2026-01-19 | MARKWEST - CADIZ GAS PLANT | CADIZ, Harrison, OH | Pass | State |
| 2026-01-19 | MARKWEST - CADIZ GAS PLANT | CADIZ, Harrison, OH | Pass | State |
| 2026-01-19 | MARKWEST - CADIZ GAS PLANT | CADIZ, Harrison, OH | Pass | State |
| 2026-01-19 | MARKWEST - CADIZ GAS PLANT | CADIZ, Harrison, OH | Pass | State |
| 2026-01-16 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-16 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-16 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-16 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-15 | HONDA DEVELOPMENT & MANUFACTURING OF AMERICA, LLC - ADC | RAYMOND, Union, OH | Pass | State |
| 2026-01-15 | HONDA DEVELOPMENT & MANUFACTURING OF AMERICA, LLC - ADC | RAYMOND, Union, OH | Pass | State |
| 2026-01-15 | HONDA DEVELOPMENT & MANUFACTURING OF AMERICA, LLC - ADC | RAYMOND, Union, OH | Pass | State |
| 2026-01-15 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-15 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-01-14 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-14 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-14 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-14 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
| 2026-01-14 | POET BIOREFINING - MARION, LLC | MARION, Marion, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.