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 |
|---|---|---|---|---|
| 2025-08-21 | IACX ENERGY - OTIS STATION (DEHYS)(AIR) | OTIS, Rush, KS | Pass | State |
| 2025-08-21 | BENEVENTO ASPHALT CORPORATION | WILMINGTON, Middlesex, MA | Pass | U.S. EPA |
| 2025-08-21 | MINNESOTA PAVING AND MATERIALS - NUQQ | NEW ULM, Nicollet, MN | Pass | State |
| 2025-08-21 | ARDENT MILLS LLC | LAKE CITY, Wabasha, MN | Pass | State |
| 2025-08-21 | MARATHON SAINT PAUL PARK REFINERY | SAINT PAUL PARK, Washington, MN | N/A | State |
| 2025-08-21 | ARDAGH GLASS INC. | PEVELY, Jefferson, MO | Fail | State |
| 2025-08-21 | ARDAGH GLASS INC. | PEVELY, Jefferson, MO | Fail | State |
| 2025-08-21 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pass | State |
| 2025-08-21 | INGREDION, INC. — high-priority violation on file | WINSTON-SALEM, Forsyth, NC | Pass | Local |
| 2025-08-21 | VALERO RENEWABLE FUELS COMPANY — high-priority violation on file | ALBION, Boone, NE | N/A | State |
| 2025-08-21 | ADM CORN PROCESSING — high-priority violation on file | COLUMBUS, Platte, NE | N/A | State |
| 2025-08-21 | ADM CORN PROCESSING — high-priority violation on file | COLUMBUS, Platte, NE | Fail | State |
| 2025-08-21 | CARGILL INC — high-priority violation on file | BLAIR, Washington, NE | Pass | State |
| 2025-08-21 | SPUD MUFFIN 31 CTB 2 AND HARROUN TRUST 31 5H BATTERY | MALAGA, Eddy, NM | Pass | State |
| 2025-08-21 | SPUD MUFFIN 31 CTB 2 AND HARROUN TRUST 31 5H BATTERY | MALAGA, Eddy, NM | Pass | State |
| 2025-08-21 | CEDAR FED TB — high-priority violation on file | LOCO HILLS, Eddy, NM | Pass | State |
| 2025-08-21 | EUNICE GAS PROCESSING PLANT — high-priority violation on file | EUNICE, Lea, NM | Pass | State |
| 2025-08-21 | HARRIER COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-08-21 | HARRIER COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-08-21 | EOG - GOLDEN BEAR LOCAL GAS LIFT | JAL, Lea, NM | Pass | State |
| 2025-08-21 | EOG - GOLDEN BEAR LOCAL GAS LIFT | JAL, Lea, NM | Pass | State |
| 2025-08-21 | COBRA COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-08-21 | COVANTA HUNTINGTON LLC | E NORTHPORT, Suffolk, NY | Pass | State |
| 2025-08-21 | RENSSELAER COGEN FACILITY | RENSSELAER, Rensselaer, NY | 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 |
| 2025-08-21 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-08-21 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-08-21 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-08-21 | PPG - SOUTH PLANT — high-priority violation on file | BARBERTON, Summit, OH | Fail | State |
| 2025-08-21 | DEVON ENERGY PRODUCTION CO LP / WIGINGTON 17 PAD 1 | GREENFIELD, Blaine, OK | Pass | State |
| 2025-08-21 | DEVON ENERGY PRODUCTION CO LP / WIGINGTON 17 PAD 1 | GREENFIELD, Blaine, OK | Pass | State |
| 2025-08-21 | BCE MACH III LLC / HUMPHREY 2 5H LNU 92 2HO LSEOU 10 2HO | DOVER, Kingfisher, OK | Pass | State |
| 2025-08-21 | BCE MACH LLC / HADA LAND AND CATTLE 3 28 15 1H STA | ALVA, Woods, OK | Pass | State |
| 2025-08-21 | BCE MACH LLC / MACK 10 27 17 1H | FREEDOM, Woods, OK | Pass | State |
| 2025-08-21 | BCE MACH LLC / NIGHSWONGER 7 28 14 1H AND HLN FARMS 7 | ALVA, Woods, OK | Pass | State |
| 2025-08-21 | WHEATLAND TUBE COUNCIL AVE PLT/WHEATLAND TUBE LLC — high-priority violation on file | WHEATLAND, Mercer, PA | Pass | State |
| 2025-08-21 | UNITED REFINING CO/WARREN PLT | WARREN, Warren, PA | Pass | State |
| 2025-08-21 | TEXAS EASTERN TRANS LP/PERULACK STA | EAST WATERFORD, Juniata, PA | Pass | State |
| 2025-08-21 | READING TERM DE LLC/SINKING SPRING E & W TERM | SINKING SPRING, Berks, PA | Pass | State |
| 2025-08-21 | BLACKHILL ENERGY LLC/BRADFORD CNTY COMP STA | COLUMBIA CROSS ROADS, Bradford, PA | Pass | State |
| 2025-08-21 | BLACKHILL ENERGY LLC/BEARDSLEE COMP STA | TROY, Bradford, PA | Pass | State |
| 2025-08-21 | EXPAND OPERATING LLC/RU-75 SGL-A WELLPAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-08-21 | EXPAND OPERATING LLC/RU-75 SGL-A WELLPAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-08-21 | PRIMARY PRODUCTS INGREDIENTS AMERICAS LLC — high-priority violation on file | LOUDON, Loudon, TN | Pass | State |
| 2025-08-21 | GUAJILLO CENTRAL FACILITY | WHITSETT, Atascosa, TX | Pass | State |
| 2025-08-21 | CHEVRON USA | UTAH, Undetermined, UT | Pass | State |
| 2025-08-21 | DOMINION ENERGY - VIRGINIA CITY HYBRID ENERGY CENTER | ST PAUL, Wise, VA | Pass | State |
| 2025-08-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-21 | HOLLYFRONTIER PUGET SOUND REFINERY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-08-21 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-08-21 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-08-21 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-08-21 | FLINT HILLS RESOURCES PINE BEND LLC - WAUPUN FACILITY | WAUPUN, Fond du Lac, WI | Pass | State |
| 2025-08-21 | CALUMET RENEWABLE ENERGY - DAIRY DREAMS FACILITY — high-priority violation on file | CASCO, Kewaunee, WI | Pass | State |
| 2025-08-21 | CRANBERRY PIPELINE CORPORATION, LESTER/BUCK STATI | LESTER, Raleigh, WV | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-21 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-21 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-21 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-21 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-21 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-21 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-21 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-21 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-21 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-08-21 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-08-21 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-21 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-20 | HILCORP ALASKA, LLC / MILNE POINT L-PAD | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2025-08-20 | INTERNATIONAL PAPER COMPANY | PRATTVILLE, Autauga, AL | Pass | State |
| 2025-08-20 | INTERNATIONAL PAPER COMPANY | PRATTVILLE, Autauga, AL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.