EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 11,110Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,474
- Indiana 1,010
- California 979
- Florida 795
- Wyoming 755
- New Mexico 724
- Georgia 509
- Pennsylvania 501
- Arkansas 374
- Alabama 357
- Missouri 326
- Texas 316
- Mississippi 263
- Michigan 207
- North Carolina 188
- Colorado 185
- Iowa 167
- Illinois 165
- South Carolina 135
- Wisconsin 135
- West Virginia 114
- Virginia 98
- Idaho 96
- Montana 91
- Tennessee 84
- Minnesota 84
- Delaware 73
- Kentucky 71
- Arizona 71
- Connecticut 68
- Kansas 63
- Nevada 57
- Massachusetts 54
- North Dakota 52
- Nebraska 51
- Utah 51
- Washington 46
- Alaska 45
- New York 43
- South Dakota 34
- District of Columbia 30
- New Hampshire 29
- Maryland 28
- Oregon 27
- Louisiana 26
- Hawaii 21
- Oklahoma 15
- Rhode Island 13
- Puerto Rico 5
- Maine 5
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-05-27 | AMRIZE BUILDING ENVELOPE LLC | DEFOREST, Dane, WI | Pass | State |
| 2026-05-27 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2026-05-27 | QUIKRETE CONSTRUCTION MATERIALS, LLC, QUIKRETE CEMENT — high-priority violation on file | MARTINSBURG, Berkeley, WV | Pass | State |
| 2026-05-27 | COLUMBIA GAS TRANSMISSION, LLC, LONE OAK STATION | CAMERON, Marshall, WV | Pass | State |
| 2026-05-27 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-27 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-27 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-26 | EVONIK CORPORATION | THEODORE, Mobile, AL | Pass | State |
| 2026-05-26 | JET ASPHALT & ROCK COMPANY, INC - FORDYCE PLANT | FORDYCE, Dallas, AR | Pass | State |
| 2026-05-26 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-26 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | HIGHPOINT - HAWKINS 5-61-21 | WIGGINS 12.7 MI. NW OF, Weld, CO | N/A | State |
| 2026-05-26 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-26 | KRAEMER MINING & MATERIALS - BURNSVILLE | BURNSVILLE, Dakota, MN | Pass | State |
| 2026-05-26 | CENTRAL STONE CO-EWING PLANT CS 36 | EWING, Lewis, MO | Pass | State |
| 2026-05-26 | CENTRAL STONE CO-EWING PLANT CS 36 | EWING, Lewis, MO | Pass | State |
| 2026-05-26 | CENTRAL STONE COMPANY - HUNTINGTON PLANT | HANNIBAL, Ralls, MO | Pass | State |
| 2026-05-26 | CENTRAL STONE COMPANY - HUNTINGTON PLANT | HANNIBAL, Ralls, MO | Pass | State |
| 2026-05-26 | CENTRAL STONE COMPANY - HUNTINGTON PLANT | HANNIBAL, Ralls, MO | Pass | State |
| 2026-05-26 | CENTRAL STONE COMPANY - HUNTINGTON PLANT | HANNIBAL, Ralls, MO | Pass | State |
| 2026-05-26 | CENTRAL STONE COMPANY - HUNTINGTON PLANT | HANNIBAL, Ralls, MO | Pass | State |
| 2026-05-26 | CENTRAL STONE COMPANY - HUNTINGTON PLANT | HANNIBAL, Ralls, MO | Pass | State |
| 2026-05-26 | KENTUCKY TENNESSEE CLAY COMPANY, SLEDGE | CRENSHAW, Quitman, MS | Pass | State |
| 2026-05-26 | TAR HEEL MATERIALS & HANDLING, LLC (ACI) | CLEVELAND, Rowan, NC | Pass | State |
| 2026-05-26 | REDTAIL COMPRESSOR STATION | BUSHNELL, Kimball, NE | Pass | State |
| 2026-05-26 | BORGER STATION | DRYDEN, Tompkins, NY | Pass | State |
| 2026-05-26 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-26 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-26 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-26 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-26 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-26 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-26 | EOG RESOURCES, INC. - GOODING CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-05-26 | EOG RESOURCES, INC. - GOODING CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-05-26 | EOG RESOURCES, INC. - GOODING CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-05-26 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2026-05-26 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2026-05-26 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2026-05-26 | CITGO CORPUS CHRISTI REFINERY EAST PLANT — high-priority violation on file | CORPUS CHRISTI, Nueces, TX | Pass | State |
| 2026-05-26 | MARSHFIELD UTILITIES COMBUSTION TURBINE | MARSHFIELD, Wood, WI | Pass | State |
| 2026-05-23 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-05-22 | SEWELL CREEK ENERGY FACILITY | CEDARTOWN, Polk, GA | Pass | State |
| 2026-05-22 | NE RENEWABLE POWER FITCHBURG LLC | WESTMINSTER, Worcester, MA | Pending | State |
| 2026-05-22 | NE RENEWABLE POWER FITCHBURG LLC | WESTMINSTER, Worcester, MA | Pending | State |
| 2026-05-22 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-05-22 | LIFE TECHNOLOGIES CORPORATION | DETROIT, Wayne, MI | Pass | State |
| 2026-05-22 | FADEAWAY RIDGE COMPRESSOR STATION | ARTESIA, Eddy, NM | Pass | State |
| 2026-05-22 | BIG SINKS COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-05-22 | YORK CNTY SOLID WASTE/YORK CNTY RESOURCE RECOVERY — high-priority violation on file | YORK, York, PA | Pass | State |
| 2026-05-22 | EXPAND OPERATING LLC/MCENANEY BRA PAD | NEW ALBANY, Bradford, PA | Pass | State |
| 2026-05-22 | EXPAND OPERATING LLC/CERCA BRA PAD | WYALUSING, Bradford, PA | Pass | State |
| 2026-05-22 | NORTHEAST WPCP/PHILA — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2026-05-22 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | WOODS CROSS, Davis, UT | Pass | State |
| 2026-05-22 | GP BIG ISLAND LLC | BIG ISLAND, Bedford, VA | Pass | State |
| 2026-05-22 | QUAD/GRAPHICS, INC., HEDGESVILLE | MARTINSBURG, Berkeley, WV | Pass | State |
| 2026-05-21 | CITY OF CONWAY SANITARY LANDFILL | CONWAY, Faulkner, AR | Fail | State |
| 2026-05-21 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ELECTRIC BOAT CORPORATION — high-priority violation on file | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2026-05-21 | WHEELABRATOR LISBON INC. | CONNECTICUT, Undetermined, CT | Pass | State |
| 2026-05-21 | WHEELABRATOR LISBON INC. | CONNECTICUT, Undetermined, CT | Pass | State |
| 2026-05-21 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-21 | KM PHOENIX HOLDINGS-DORAVILLE TERMINAL | DORAVILLE, DeKalb, GA | Pass | State |
| 2026-05-21 | SEWELL CREEK ENERGY FACILITY | CEDARTOWN, Polk, GA | Pass | State |
| 2026-05-21 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-21 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-21 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.