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 |
|---|---|---|---|---|
| 2025-10-29 | RICE DRILLING D LLC - DANGEL PAD | SARDIS, Monroe, OH | Pass | State |
| 2025-10-29 | MORIROKU TECHNOLOGY NORTH AMERICA - GREENVILLE | GREENVILLE, Darke, OH | Pass | State |
| 2025-10-29 | MORIROKU TECHNOLOGY NORTH AMERICA - GREENVILLE | GREENVILLE, Darke, OH | Pass | State |
| 2025-10-29 | UNIVERSITY OF CINCINNATI | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-10-29 | UNIVERSITY OF CINCINNATI | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-10-29 | UNIVERSITY OF CINCINNATI | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-10-29 | UNIVERSITY OF CINCINNATI | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-10-29 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-10-29 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-10-29 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-10-29 | COLUMBIA GAS TRANS CORP/FORKS TWP FAC EASTON CTA | EASTON, Northampton, PA | Pass | State |
| 2025-10-29 | YORK CNTY SOLID WASTE/YORK CNTY RESOURCE RECOVERY — high-priority violation on file | YORK, York, PA | Pass | State |
| 2025-10-29 | SUNOCO MIDSTREAM LLC/ALTOONA | ALTOONA, Blair, PA | Pass | State |
| 2025-10-29 | ADELPHIA GATEWAY/MARTINS CREEK STA | BANGOR, Northampton, PA | Pass | State |
| 2025-10-29 | MIRIAM HOSPITAL | PROVIDENCE, Providence, RI | Pending | State |
| 2025-10-29 | RI RESOURCE RECOVERY CORP-CENTRAL LNDFL | JOHNSTON, TOWN OF, Providence, RI | Pass | State |
| 2025-10-29 | CENTRAL VALLEY WATER RECLAMATION | SALT LAKE CITY, Salt Lake, UT | Pass | State |
| 2025-10-29 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-29 | RICHMOND ENERGY LLC | HENRICO, Henrico, VA | Pass | State |
| 2025-10-29 | AMAZON DATA SERVICES IAD-156, IAD-157, IAD-158, IAD-159, AND IAD-327 | CHANTILLY, Loudoun, VA | Pass | State |
| 2025-10-29 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Fail | State |
| 2025-10-29 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-10-29 | MOUNTAIN STATE CLEAN ENERGY, LLC, MAIDSVILLE | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2025-10-29 | MOUNTAIN STATE CLEAN ENERGY, LLC, MAIDSVILLE | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2025-10-29 | GREER LIME COMPANY, RIVERTON | RIVERTON, Pendleton, WV | Pass | State |
| 2025-10-29 | DAVE JOHNSTON (PACIFICORP) | GLENROCK, Converse, WY | Pass | State |
| 2025-10-29 | DAVE JOHNSTON (PACIFICORP) | GLENROCK, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-29 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-28 | TARGA- CLARK'S CREEK COMPRESSOR STATION | KEENE, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-28 | TARGA- CLARK'S CREEK COMPRESSOR STATION | KEENE, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-28 | TARGA- CLARK'S CREEK COMPRESSOR STATION | KEENE, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-28 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-28 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-28 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-28 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-28 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-28 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-28 | BUFFALO COMPRESSOR STATION | MANDAREE SEGMENT, Dunn, ND | Pass | U.S. EPA |
| 2025-10-28 | BUFFALO COMPRESSOR STATION | MANDAREE SEGMENT, Dunn, ND | Pass | U.S. EPA |
| 2025-10-28 | BUFFALO COMPRESSOR STATION | MANDAREE SEGMENT, Dunn, ND | Pass | U.S. EPA |
| 2025-10-28 | WESTROCK COMPANY, LLC | STEVENSON, Jackson, AL | Pass | State |
| 2025-10-28 | WESTROCK COMPANY, LLC | STEVENSON, Jackson, AL | Pass | State |
| 2025-10-28 | WESTROCK COMPANY, LLC | STEVENSON, Jackson, AL | Pass | State |
| 2025-10-28 | COOPER MARINE & TIMBERLANDS, CORP. | CARROLLTON, Pickens, AL | Pass | State |
| 2025-10-28 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-10-28 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-10-28 | LA CITY DWP- VALLEY GENERATING STN | SUN VALLEY, Los Angeles, CA | Pass | Local |
| 2025-10-28 | PHILLIPS 66 COMPANY/LA REFINERY | CARSON, Los Angeles, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-28 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-28 | PLAINS END, LLC | ARVADA, Jefferson, CO | Pass | State |
| 2025-10-28 | COLORADO INTERSTATE GAS CO - CHEYENNE CS — high-priority violation on file | NUNN 14.8 MI. N OF, Weld, CO | Pass | State |
| 2025-10-28 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Fail | State |
| 2025-10-28 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | N/A | State |
| 2025-10-28 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-28 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-28 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-28 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-28 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.