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 |
|---|---|---|---|---|
| 2025-08-19 | 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 | DEVON ENERGY PRODUCTION CO LP / BRADFORD LAKE 23 PAD 1 | WATONGA, Blaine, OK | Pass | State |
| 2025-08-19 | ONEOK GAS TRANSPORTATION LLC / KELLYVILLE COMPRESSOR STATION | KELLYVILLE, Creek, OK | Pass | State |
| 2025-08-19 | ONEOK FIELD SERVICES CO LLC / WEST SMALLWOOD COMPRESSOR STATION | HAMMON, Custer, OK | Pass | State |
| 2025-08-19 | CONTINENTAL RESOURCES / DALWHINNIE 1R 5 4 3XHW PORTMAGEE 1 32 | DAVIS, Garvin, OK | Pass | State |
| 2025-08-19 | CONTINENTAL RESOURCES / DYER 3 4 30 31XHW JACQUEZ 6 19 18XHS | TABLER, Grady, OK | Pass | State |
| 2025-08-19 | MARKWEST OKLAHOMA GAS CO LLC / STUART NORTH COMPRESSOR STATION | STUART, Hughes, OK | Pass | State |
| 2025-08-19 | MARKWEST OKLAHOMA GAS CO LLC / MOSS COMPRESSOR STATION | HOLDENVILLE, Hughes, OK | Pass | State |
| 2025-08-19 | DEVON ENERGY PRODUCTION CO LP / SHOWBOAT PAD 3 | ALPHA, Kingfisher, OK | Pass | State |
| 2025-08-19 | ONEOK FIELD SERVICES CO LLC / WOODS COMPRESSOR STATION | LEEDEY, Roger Mills, OK | Pass | State |
| 2025-08-19 | BCE MACH LLC / BUSH RANCH 2 28 17 1H STATION | FREEDOM, Woods, OK | Pass | State |
| 2025-08-19 | BCE MACH LLC / KATHARINA 6 28 16 STA | ALVA, Woods, OK | Pass | State |
| 2025-08-19 | READING TERM DE LLC/SINKING SPRING E & W TERM | SINKING SPRING, Berks, PA | Pass | State |
| 2025-08-19 | OLDCASTLE APG NORTHEAST INC / BRISTOL | BRISTOL, Bucks, PA | Pass | State |
| 2025-08-19 | HERSHEY CO/WWTP | HERSHEY, Dauphin, PA | Pass | State |
| 2025-08-19 | EXPAND OPERATING LLC/RU-46 DROPP WELLPAD | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2025-08-19 | EXPAND OPERATING LLC/RU-47 KARMAZIN PAD | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2025-08-19 | CNX MIDSTREAM OPR CO LLC/MOR-44 COMP STA | WEST FINLEY, Washington, PA | Pass | State |
| 2025-08-19 | VALERO RENEWABLE FUELS COMPANY LLC — high-priority violation on file | AURORA, Brookings, SD | Pass | State |
| 2025-08-19 | CHEVRON USA | UTAH, Undetermined, UT | Pass | State |
| 2025-08-19 | ENVIVA SOUTHAMPTON | FRANKLIN, Southampton, VA | Pass | State |
| 2025-08-19 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-19 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-08-19 | HOLLYFRONTIER PUGET SOUND REFINERY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-08-19 | BARRON COUNTY WASTE TO ENERGY AND RECYCLING FACILITY — high-priority violation on file | ALMENA, Barron, WI | Pass | State |
| 2025-08-19 | BARRON COUNTY WASTE TO ENERGY AND RECYCLING FACILITY — high-priority violation on file | ALMENA, Barron, WI | Fail | State |
| 2025-08-19 | BUCKHORN RNG, LLC | UNITY, Marathon, WI | Pass | State |
| 2025-08-19 | GREDE LLC - LIBERTY — high-priority violation on file | WAUWATOSA, Monroe, WI | Pass | State |
| 2025-08-19 | FLINT HILLS RESOURCES PINE BEND, LLC - M | MILWAUKEE, Milwaukee, WI | Pass | State |
| 2025-08-19 | EASTERN GAS TRANSMISSION AND STORAGE, INC., LIGHTBURN STATION | JANE LEW, Lewis, WV | Pass | State |
| 2025-08-19 | EQT XL MIDSTREAM OPERATING LLC, CHANNING COMPRESSOR | PROCTOR, Marshall, WV | Pass | State |
| 2025-08-19 | PLEASANTS ENERGY, LLC, WAVERLY | WILLOW ISLAND, Pleasants, WV | Pass | State |
| 2025-08-19 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Fail | State |
| 2025-08-19 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Fail | State |
| 2025-08-19 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-19 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-19 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-19 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-18 | DESOTO GATHERING COMPANY LLC - NEW QUITMAN CPF-4 | QUITMAN, Faulkner, AR | Pass | State |
| 2025-08-18 | DESOTO GATHERING COMPANY, LLC - YOGI CPF-1 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-18 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.