EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-08-26 | FORMENTERA OPERATIONS / PEACH PAD | BISON, Garfield, OK | Pass | State |
| 2025-08-26 | FORMENTERA OPERATIONS / ELVERDA PAD | BISON, Garfield, OK | Pass | State |
| 2025-08-26 | FORMENTERA OPERATIONS / ELVERDA PAD | BISON, Garfield, OK | Pass | State |
| 2025-08-26 | FORMENTERA OPERATIONS / ARLENE PAD | BISON, Garfield, OK | Pass | State |
| 2025-08-26 | SUPERIOR MIDSTREAM LLC / REEDING COMPRESSOR STATION | CASHION, Kingfisher, OK | Pass | State |
| 2025-08-26 | BCE MACH III LLC / LNU 15 6HO 41 3HO PAD | DOVER, Kingfisher, OK | Pass | State |
| 2025-08-26 | BCE MACH III LLC / LNU 15 6HO 41 3HO PAD | DOVER, Kingfisher, OK | Pass | State |
| 2025-08-26 | BCE MACH III LLC / COPPERPLATE 1605 1 3MH PAD | KINGFISHER, Kingfisher, OK | Pass | State |
| 2025-08-26 | SUPERIOR MIDSTREAM LLC / CASHION NORTH BOOSTER STATION (WASWO) | CASHION, Logan, OK | Pass | State |
| 2025-08-26 | ET GATHERING PROCESSING LLC / ROSE VALLEY PLANT | ALVA, Woods, OK | Pass | State |
| 2025-08-26 | ET GATHERING PROCESSING LLC / ROSE VALLEY PLANT | ALVA, Woods, OK | Pass | State |
| 2025-08-26 | ET GATHERING PROCESSING LLC / ROSE VALLEY PLANT | ALVA, Woods, OK | Pass | State |
| 2025-08-26 | MAGNESITA REFRACTORIES/YORK — high-priority violation on file | YORK, York, PA | Pass | State |
| 2025-08-26 | EASTERN GAS TRANS & STORAGE/PUNXSUTAWNEY | PUNXSUTAWNEY, Jefferson, PA | Pass | State |
| 2025-08-26 | NFG MIDSTREAM COVINGTON LLC/DCNR TRACT 595 | ARNOT, Tioga, PA | Pass | State |
| 2025-08-26 | XTO ENERGY INC/WINSLOW | REYNOLDSVILLE, Jefferson, PA | Fail | State |
| 2025-08-26 | EQM GATHERING OPCO LLC/STEELHEAD COMP STA | MARIANNA, Washington, PA | Pass | State |
| 2025-08-26 | ALTA PERFORMANCE MATERIALS US, LLC | PITTSBURGH, Allegheny, PA | Pass | Local |
| 2025-08-26 | KING ASPHALT INC - ROCK HILL | ROCK HILL, York, SC | Pass | State |
| 2025-08-26 | BOGGS PAVING INC LYNCHES RIVER PLANT | JEFFERSON, Chesterfield, SC | Pass | State |
| 2025-08-26 | ALLEN COMBINED CYCLE PLANT - TVA | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-08-26 | COLUMBIA GAS TRANSMISSION CORPORATION GALA COMPRES | EAGLE ROCK, Botetourt, VA | Pass | State |
| 2025-08-26 | GLOBAL CELLULOSE FIBERS - FRANKLIN MILL | FRANKLIN, Isle of Wight, VA | Pass | State |
| 2025-08-26 | WESTROCK CP LLC - WEST POINT | WEST POINT, King William, VA | Pass | State |
| 2025-08-26 | WESTROCK CP LLC - WEST POINT | WEST POINT, King William, VA | Pass | State |
| 2025-08-26 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-26 | WEYERHAEUSER NR RAYMOND LUMBERMILL | RAYMOND, Pacific, WA | Pass | Local |
| 2025-08-26 | MG&E WEST CAMPUS COGENERATION FTY | MADISON, Dane, WI | Pass | State |
| 2025-08-26 | DANE RENEWABLE ENERGY LLC | SUN PRAIRIE, Dane, WI | N/A | State |
| 2025-08-26 | 3M - MENOMONIE PLANT — high-priority violation on file | MENOMONIE, Dunn, WI | Pass | State |
| 2025-08-26 | MOUNTAIN VALLEY PIPELINE, LLC, STALLWORTH STATION | MEADOW BRIDGE, Fayette, WV | Pass | State |
| 2025-08-26 | KENTUCKY POWER COMPANY, MITCHELL PLANT | MOUNDSVILLE, Marshall, WV | Pass | State |
| 2025-08-26 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-26 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-26 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-26 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-25 | BONANZA CREEK - STATE NORTH PLATTE T-36 | KERSEY 8.3 MI. E OF, Weld, CO | Pass | State |
| 2025-08-25 | BONANZA CREEK - STATE NORTH PLATTE T-36 | KERSEY 8.3 MI. E OF, Weld, CO | Pass | State |
| 2025-08-25 | BONANZA CREEK - STATE NORTH PLATTE T-36 | KERSEY 8.3 MI. E OF, Weld, CO | Pass | State |
| 2025-08-25 | FLORIDA POWER & LIGHT COMPANY | LYNN HAVEN, Bay, FL | Pass | State |
| 2025-08-25 | FLORIDA POWER & LIGHT COMPANY | LYNN HAVEN, Bay, FL | Pass | State |
| 2025-08-25 | U S DEPT OF AGRICULTURE | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-08-25 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC - COMPRESSOR STATION 120 | STOCKBRIDGE, Henry, GA | Pass | State |
| 2025-08-25 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC - COMPRESSOR STATION 120 | STOCKBRIDGE, Henry, GA | Pass | State |
| 2025-08-25 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC - COMPRESSOR STATION 120 | STOCKBRIDGE, Henry, GA | Pass | State |
| 2025-08-25 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC - COMPRESSOR STATION 120 | STOCKBRIDGE, Henry, GA | Pass | State |
| 2025-08-25 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Pass | State |
| 2025-08-25 | AMRIZE - SPARROWS POINT FACILITY | SPARROWS POINT, Baltimore, MD | Pass | State |
| 2025-08-25 | C&C ENERGY LLC — high-priority violation on file | MARSHALL, Calhoun, MI | Pass | State |
| 2025-08-25 | CAMBRIA CO | LE SUEUR, Le Sueur, MN | Pass | State |
| 2025-08-25 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Pass | State |
| 2025-08-25 | MATHIS LANDSCAPES WNC, INC. (ACI) — high-priority violation on file | CULLOWHEE, Jackson, NC | Pending | State |
| 2025-08-25 | NOVANT HEALTH PRESBYTERIAN MEDICAL CENTER, INC. | CHARLOTTE, Mecklenburg, NC | Pass | Local |
| 2025-08-25 | MATCHBOX COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-08-25 | MATCHBOX COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-08-25 | ENERGY TRANSFER COMPANY - DOMINATOR COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-08-25 | ENERGY TRANSFER COMPANY - DOMINATOR COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-08-25 | IGGLES TB | MONUMENT, Lea, NM | Pass | State |
| 2025-08-25 | IGGLES TB | MONUMENT, Lea, NM | Pass | State |
| 2025-08-25 | CORNING DIESEL MANUFACTURING FACILITY | PAINTED POST, Steuben, NY | 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 |
| 2025-08-25 | DEVON ENERGY PRODUCTION CO LP / MOOSE 35 PAD 1 | WATONGA, Blaine, OK | Pass | State |
| 2025-08-25 | IRON HORSE MIDSTREAM LLC / CRUSADER COMPRESSOR STATION | EL RENO, Canadian, OK | Pass | State |
| 2025-08-25 | IRON HORSE MIDSTREAM LLC / CRUSADER COMPRESSOR STATION | EL RENO, Canadian, OK | Pass | State |
| 2025-08-25 | IRON HORSE MIDSTREAM LLC / CRUSADER COMPRESSOR STATION | EL RENO, Canadian, OK | Pass | State |
| 2025-08-25 | MLA MIDSTREAM LLC / POD 4 OIL AND GAS PRODUCTION FACILITY | COALGATE, Coal, OK | Pass | State |
| 2025-08-25 | FORMENTERA OPERATIONS / FRANCIS 26 M4H FRANCIS 36 M1H | DOUGLAS, Garfield, OK | Pass | State |
| 2025-08-25 | FORMENTERA OPERATIONS / BRETT PAD | HENNESSEY, Kingfisher, OK | Pass | State |
| 2025-08-25 | FORMENTERA OPERATIONS / DONALD 28 33 PAD | MARSHALL, Kingfisher, OK | Pass | State |
| 2025-08-25 | FORMENTERA OPERATIONS / BRETT 2 PAD | MARSHALL, Kingfisher, OK | Pass | State |
| 2025-08-25 | FORMENTERA OPERATIONS / DONALD 32 M1SH PAD | HENNESSEY, Kingfisher, OK | Pass | State |
| 2025-08-25 | BCE MACH III LLC / LNU 59 5HO LNU 59 6HO LNU 60 5HO PAD | DOVER, Kingfisher, OK | Pass | State |
| 2025-08-25 | SUPERIOR MIDSTREAM LLC / CASHION NORTH BOOSTER STATION (WASWO) | CASHION, Logan, OK | Pass | State |
| 2025-08-25 | LAUREL HILL PAD A 12635 | LIBERTY, Lycoming, PA | Pass | State |
| 2025-08-25 | NEW CHESTER RENEWABLE ENERGY LLC | GRAND MARSH, Adams, WI | Pass | State |
| 2025-08-25 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-25 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-25 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-25 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-25 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-25 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-24 | TECK ALASKA, INC. (TECK) / RED DOG MINE — high-priority violation on file | KOTZEBUE, Northwest Arctic, AK | Pass | State |
| 2025-08-24 | TECK ALASKA, INC. (TECK) / RED DOG MINE — high-priority violation on file | KOTZEBUE, Northwest Arctic, AK | Pass | State |
| 2025-08-24 | TECK ALASKA, INC. (TECK) / RED DOG MINE — high-priority violation on file | KOTZEBUE, Northwest Arctic, AK | Pass | State |
| 2025-08-24 | EVERGY - LAWRENCE (AIR) | LAWRENCE, Douglas, KS | Pass | State |
| 2025-08-24 | MARLAN GAS PLANT | CARLSBAD, Eddy, NM | Pass | State |
| 2025-08-24 | MARLAN GAS PLANT | CARLSBAD, Eddy, NM | Pass | State |
| 2025-08-24 | MARLAN GAS PLANT | CARLSBAD, Eddy, NM | 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 |
| 2025-08-24 | ROSENDALE RENEWABLE ENERGY, LLC | ROSENDALE, Fond du Lac, WI | Pass | State |
| 2025-08-23 | CALUMET RENEWABLE ENERGY, LLC - PAGELS PONDEROSA FACILITY | KEWAUNEE, Kewaunee, WI | Pass | State |
| 2025-08-22 | RAZORBACK GATHERING COMPANY, LLC. - HARMONY CPF 1 | SEARCY, White, AR | Pass | State |
| 2025-08-22 | RAZORBACK GATHERING COMPANY, LLC. - HARMONY CPF 1 | SEARCY, White, AR | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.