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 |
|---|---|---|---|---|
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-04-14 | NFG MIDSTREAM COVINGTON LLC/STOCK 144 COMP STA | WELLSBORO, Tioga, PA | Pending | State |
| 2026-04-14 | WILLIAMS FIELD SVC CO LLC/NORTHEAST COMP STA | HALLSTEAD, Susquehanna, PA | Pass | State |
| 2026-04-14 | STARZEC, E. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-04-14 | GEIGER, K. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-04-14 | SYLVAMO NORTH AMERICA LLC - EASTOVER MILL | EASTOVER, Richland, SC | Pending | State |
| 2026-04-14 | WEIR SPECIALTY PUMPS/ENVIROTECH RUBBER | SALT LAKE CITY, Salt Lake, UT | Pass | State |
| 2026-04-14 | LSC COMMUNICATIONS BOOK, LLC - HARRISONBURG NORTH | HARRISONBURG, Rockingham, VA | Pass | State |
| 2026-04-14 | ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER | PARDEEVILLE, Columbia, WI | Pass | State |
| 2026-04-14 | DEER TRACK PARK LANDFILL | WATERTOWN, Jefferson, WI | Pass | State |
| 2026-04-14 | KENTUCKY POWER COMPANY, MITCHELL PLANT | MOUNDSVILLE, Marshall, WV | Pass | State |
| 2026-04-14 | MORGANTOWN ENERGY ASSOCIATES, MORGANTOWN PLANT | MORGANTOWN, Monongalia, WV | Pass | State |
| 2026-04-14 | ANTERO MIDSTREAM LLC, LAFFERTY STATION | PENNSBORO, Ritchie, WV | Pass | State |
| 2026-04-13 | DESOTO GATHERING COMPANY, LLC - YOGI CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-04-13 | DESOTO GATHERING COMPANY, LLC - YOGI CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-04-13 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-13 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-13 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-13 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2026-04-13 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2026-04-13 | FLORIDA POWER & LIGHT COMPANY | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-13 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2026-04-13 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2026-04-13 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2026-04-13 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-13 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-13 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-13 | TROJAN BATTERY COMPANY, LLC | LITHONIA, DeKalb, GA | Pass | State |
| 2026-04-13 | TROJAN BATTERY COMPANY, LLC | LITHONIA, DeKalb, GA | Pass | State |
| 2026-04-13 | RUSTLER BREAKS FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-04-13 | RUSTLER BREAKS FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-04-13 | BEDROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-13 | BEDROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-13 | NINA CORTEL COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-04-13 | NINA CORTEL COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-04-13 | NINA CORTEL COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-04-13 | NINA CORTEL COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-04-13 | HOGNOSE VIPER 23 CTB 1 | EUNICE, Lea, NM | Pass | State |
| 2026-04-13 | HOGNOSE VIPER 23 CTB 1 | EUNICE, Lea, NM | Pass | State |
| 2026-04-13 | DOMTAR PAPER CO/JOHNSONBURG MILL — high-priority violation on file | JOHNSONBURG, Elk, PA | Pass | State |
| 2026-04-13 | CABOT OIL & GAS CORP/BISHOP, B PAD 1 | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2026-04-13 | LAUFFER, J. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2026-04-13 | WEIR SPECIALTY PUMPS/ENVIROTECH RUBBER | SALT LAKE CITY, Salt Lake, UT | Pass | State |
| 2026-04-13 | ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER | PARDEEVILLE, Columbia, WI | Pass | State |
| 2026-04-13 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2026-04-13 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2026-04-13 | WE ENERGIES - VALLEY POWER PLANT | MILWAUKEE, Monroe, WI | Pass | State |
| 2026-04-12 | FLORIDA POWER & LIGHT COMPANY | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-12 | TAMPA ELECTRIC COMPANY (TEC) | GIBSONTON, Hillsborough, FL | Pass | State |
| 2026-04-12 | TAMPA ELECTRIC COMPANY (TEC) | GIBSONTON, Hillsborough, FL | Pass | State |
| 2026-04-12 | BOA 34 CTB 2 | EUNICE, Lea, NM | Pass | State |
| 2026-04-12 | SCRUBGRASS GENERATING PLT/VENANGO — high-priority violation on file | KENNERDELL, Venango, PA | Pass | State |
| 2026-04-11 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-11 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-11 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-11 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-11 | RICO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-04-10 | DESOTO GATHERING COMPANY, LLC - SOUTHEAST RAINBOW CPF-1 | BEE BRANCH, Conway, AR | Pass | State |
| 2026-04-10 | DESOTO GATHEIRNG COMPANY, LLC - GRAVEL HILL CPF-2 | CLEVELAND (HISTORICAL), TOWNSHIP OF, Van Buren, AR | Pass | State |
| 2026-04-10 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pass | State |
| 2026-04-10 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pass | State |
| 2026-04-10 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2026-04-10 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2026-04-10 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2026-04-10 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-10 | KM PHOENIX HOLDINGS - CHATTAHOOCHEE TERMINAL | ATLANTA, Fulton, GA | Pass | State |
| 2026-04-10 | LAMAR QUARRY | BARNESVILLE, Lamar, GA | Pass | State |
| 2026-04-10 | LAMAR QUARRY | BARNESVILLE, Lamar, GA | Pass | State |
| 2026-04-10 | LAMAR QUARRY | BARNESVILLE, Lamar, GA | Pass | State |
| 2026-04-10 | LAMAR QUARRY | BARNESVILLE, Lamar, GA | Pass | State |
| 2026-04-10 | LAMAR QUARRY | BARNESVILLE, Lamar, GA | Pass | State |
| 2026-04-10 | GENERAL MILLS OPERATIONS, INC. — high-priority violation on file | CEDAR RAPIDS, Linn, IA | Fail | Local |
| 2026-04-10 | HK CONTRACTORS INC 00079 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-04-10 | HK CONTRACTORS INC 00121 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-04-10 | HK CONTRACTORS INC 00168 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-04-10 | HK CONTRACTORS 00413 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-04-10 | HK CONTRACTORS INC 00463 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-04-10 | HK CONTRACTORS INC 00480 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-04-10 | HK CONTRACTORS 00495 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-04-10 | JOHN S LANE & SONS INC | AMHERST, Hampshire, MA | Pending | State |
| 2026-04-10 | JOHN S LANE & SONS INC | AMHERST, Hampshire, MA | Pending | State |
| 2026-04-10 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-04-10 | CORTEVA AGRISCIENCE LLC | MIDLAND, Midland, MI | Pass | State |
| 2026-04-10 | PANHANDLE EASTERN PIPELINE COMPANY | CENTRALIA, Boone, MO | Pending | State |
| 2026-04-10 | PANHANDLE EASTERN PIPELINE COMPANY | CENTRALIA, Boone, MO | Pending | State |
| 2026-04-10 | PANHANDLE EASTERN PIPELINE COMPANY | CENTRALIA, Boone, MO | Pending | State |
| 2026-04-10 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-04-10 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-04-10 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-04-10 | AMES CONSTRUCTION, I-40 HELENE RECOVERY CMGC | CLYDE, Haywood, NC | Pending | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.