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 |
|---|---|---|---|---|
| 2026-07-13 | DESOTO GATHERING COMPANY, LLC - SOUTHEAST RAINBOW CPF-2 | BEE BRANCH, Conway, AR | Fail | State |
| 2026-07-13 | DESOTO GATHERING COMPANY LLC - NEW QUITMAN CPF-4 | QUITMAN, Faulkner, AR | Fail | State |
| 2026-07-13 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-13 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-13 | FAIRFIELD UNIVERSITY | FAIRFIELD, Fairfield, CT | Pending | State |
| 2026-07-13 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-07-13 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-07-13 | CATERPILLAR REMAN POWERTRAIN INDIANA INC | FRANKLIN, Johnson, IN | Pass | State |
| 2026-07-13 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/JOHNSTON COMP STA | CANONSBURG, Washington, PA | Pass | State |
| 2026-07-13 | WCAA MIDSTREAM LLC/WEITZ SOUTH 20 COMP STA | ADAMSBURG, Westmoreland, PA | Pass | State |
| 2026-07-13 | BENEDIKT, K. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-07-13 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2026-07-13 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2026-07-13 | WPL - NEENAH GENERATING FACILITY — high-priority violation on file | NEENAH, Winnebago, WI | Pass | State |
| 2026-07-10 | EXTRACTION O&G - ALMA 1S-66-2524 | DENVER, Adams, CO | Pass | State |
| 2026-07-10 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-10 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-10 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-10 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-10 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-10 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-10 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-10 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-10 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-10 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-10 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-10 | AJ NONWOVENS-HAMPTON, LLC | HAMPTON, Rockingham, NH | Pending | State |
| 2026-07-10 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-07-10 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-07-10 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-07-10 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-07-10 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-07-10 | COPE STATION | COPE, Orangeburg, SC | Pending | State |
| 2026-07-10 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2026-07-10 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2026-07-10 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2026-07-10 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2026-07-10 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2026-07-10 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2026-07-10 | SOUTH KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-07-10 | SOUTH KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-07-10 | SOUTH KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-07-10 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-07-10 | AMRIZE SOUTHWEST INC.- ROCKPORT AGGREGATE FACILITY/FORMERLY UTELITE | UTAH, Undetermined, UT | Pass | State |
| 2026-07-09 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-5 | HEBER SPRINGS, Cleburne, AR | Fail | State |
| 2026-07-09 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-2 | PANGBURN, White, AR | Fail | State |
| 2026-07-09 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-07-09 | CEMEX LLC - BLACK MT. QUARRY | APPLE VALLEY, San Bernardino, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | EXTRACTION O&G - ALMA 1S-66-2524 | DENVER, Adams, CO | Pass | State |
| 2026-07-09 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-09 | MAGELLAN PIPELINE CO - FOUNTAIN TERMINAL | FOUNTAIN, El Paso, CO | N/A | State |
| 2026-07-09 | COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file | GOLDEN AREA, Jefferson, CO | N/A | State |
| 2026-07-09 | RATHDRUM POWER LLC | RATHDRUM, Kootenai, ID | Pending | State |
| 2026-07-09 | ANR PIPELINE COMPANY SULPHUR SPRINGS COMPRESSOR STATION | SULPHUR SPRINGS, Henry, IN | Pass | State |
| 2026-07-09 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-09 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-09 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-09 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-07-09 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-07-09 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-07-09 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2026-07-09 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2026-07-09 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2026-07-09 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2026-07-09 | HEP PA GATHERING LLC/GREENZWEIG COMP STA | WYALUSING, Bradford, PA | Pass | State |
| 2026-07-09 | COTERRA ENERGY INC/ADAMS J PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2026-07-09 | PAYNE, D. PAD 1 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-07-09 | KINDER MORGAN SOUTHEAST TERMINALS LLC SPARTANBURG TERMINAL | SPARTANBURG, Spartanburg, SC | Pending | State |
| 2026-07-09 | REEVES CONSTRUCTION COMPANY - PACOLET ASPHALT PLANT | PACOLET, Spartanburg, SC | Pass | State |
| 2026-07-09 | MERSEN USA GSTN CORP. | COLUMBIA, Maury, TN | Pass | State |
| 2026-07-09 | OWENS CORNING ROOFING AND ASPHALT IRVING FACILITY | IRVING, Dallas, TX | Pass | State |
| 2026-07-09 | ASH GROVE CEMENT | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-07-09 | QUIKRETE CONSTRUCTION MATERIALS, LLC, QUIKRETE CEMENT — high-priority violation on file | MARTINSBURG, Berkeley, WV | Fail | State |
| 2026-07-09 | APPALACHIA MIDSTREAM SERVICES, L.L.C., MOUNTAINEER COMPRESSOR | WELLSBURG, Brooke, WV | Pass | State |
| 2026-07-09 | GOFF CONNECTOR LLC, CONNECTOR STATION | BRIDGEPORT, Harrison, WV | Pass | State |
| 2026-07-09 | CNX MIDSTREAM OPERATING COMPANY LLC, MAJORSVILLE STATION | ALMA, Marshall, WV | Pass | State |
| 2026-07-09 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-07-09 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-07-08 | DESOTO GATHERING COMPANY, LLC - NE CHARLEY CPF-2 | DRASCO, Cleburne, AR | Fail | State |
| 2026-07-08 | SOUTHWESTERN ELECTIRC POWER COMPANY - HARRY D. MATTISON POWER PLANT | TONTITOWN, Washington, AR | Pass | State |
| 2026-07-08 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-08 | BONANZA CREEK - ANTELOPE CPF 13-21 | KERSEY 10.4 MI. E OF, Weld, CO | Pass | State |
| 2026-07-08 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-07-08 | PRIMARY PRODUCTS INGREDIENTS AMERICAS LLC | DECATUR, Macon, IL | Pass | State |
| 2026-07-08 | PRIMARY PRODUCTS INGREDIENTS AMERICAS LLC | DECATUR, Macon, IL | Pass | State |
| 2026-07-08 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-08 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.