EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 15,218Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,887
- California 1,849
- Indiana 1,315
- New Mexico 1,112
- Florida 1,099
- Wyoming 903
- Georgia 693
- Pennsylvania 636
- Arkansas 481
- Alabama 445
- Missouri 433
- Texas 337
- Mississippi 332
- Michigan 270
- Colorado 255
- Iowa 250
- North Carolina 239
- Illinois 224
- Wisconsin 190
- South Carolina 165
- Kansas 151
- West Virginia 140
- Virginia 119
- Montana 115
- Idaho 114
- Utah 109
- Minnesota 108
- Delaware 107
- Tennessee 106
- Kentucky 97
- Connecticut 92
- Washington 87
- Arizona 83
- Massachusetts 78
- Nebraska 74
- North Dakota 72
- New York 67
- Nevada 61
- Alaska 47
- New Hampshire 38
- South Dakota 36
- Louisiana 35
- District of Columbia 30
- Maryland 29
- Oregon 28
- Hawaii 24
- Rhode Island 19
- Maine 16
- Oklahoma 15
- Puerto Rico 6
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-08-13 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-08-13 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-08-13 | C & D TECHNOLOGIES INC | ATTICA, Fountain, IN | Pass | State |
| 2026-08-13 | C & D TECHNOLOGIES INC | ATTICA, Fountain, IN | Pass | State |
| 2026-08-13 | ROLLS-ROYCE CONTROL SYSTEMS — high-priority violation on file | WEST LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-08-13 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-08-13 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-08-13 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2026-08-13 | MEDICAL AREA TOTAL ENERGY | BOSTON, CITY OF, Suffolk, MA | Pending | State |
| 2026-08-13 | MEDICAL AREA TOTAL ENERGY | BOSTON, CITY OF, Suffolk, MA | Pending | State |
| 2026-08-13 | COVERT GENERATING STATION — high-priority violation on file | COVERT, Van Buren, MI | Pass | State |
| 2026-08-13 | COVERT GENERATING STATION — high-priority violation on file | COVERT, Van Buren, MI | Pass | State |
| 2026-08-13 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2026-08-13 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2026-08-13 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2026-08-13 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2026-08-13 | FARMERS GRAIN TERMINAL INC., GREENVILLE | GREENVILLE, Washington, MS | Fail | State |
| 2026-08-13 | FARMERS GRAIN TERMINAL INC., GREENVILLE | GREENVILLE, Washington, MS | Pass | State |
| 2026-08-13 | FARMERS GRAIN TERMINAL INC., GREENVILLE | GREENVILLE, Washington, MS | Pass | State |
| 2026-08-13 | FARMERS GRAIN TERMINAL INC., GREENVILLE | GREENVILLE, Washington, MS | Pass | State |
| 2026-08-13 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-13 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-08-13 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-08-13 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-08-13 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pending | State |
| 2026-08-13 | PIEDMONT NATURAL GAS - LUMBERTON FACILITY | LUMBERTON, Robeson, NC | Pending | State |
| 2026-08-13 | GREEN PLAINS WOOD RIVER LLC — high-priority violation on file | WOOD RIVER, Hall, NE | N/A | State |
| 2026-08-13 | CLINTON COUNTY REGIONAL LANDFILL | SCHUYLER FALLS, Clinton, NY | Pass | State |
| 2026-08-13 | EQUITRANS LP/TRUITTSBURG STA | FAIRMOUNT CITY, Clarion, PA | Pass | State |
| 2026-08-13 | HERSHEY CO/WWTP | HERSHEY, Dauphin, PA | Pass | State |
| 2026-08-13 | EXPAND OPERATING LLC/NOWICKI PAD NR25 | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2026-08-13 | TIVERTON POWER, INC. | TIVERTON, Newport, RI | Pass | State |
| 2026-08-13 | C R JACKSON INC - SUMTER ASPHALT PLANT | SUMTER, Sumter, SC | Pass | State |
| 2026-08-13 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pending | State |
| 2026-08-13 | PUGET SOUND ENERGY - ENCOGEN | BELLINGHAM, Whatcom, WA | Pass | Local |
| 2026-08-13 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | Pass | State |
| 2026-08-13 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | Pass | State |
| 2026-08-12 | GERDAU MACSTEEL | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-12 | LSB CHEMICAL LLC | EL DORADO, Union, AR | Pass | State |
| 2026-08-12 | DESOTO GATHERING COMPANY, LLC - TIGER CPF-1 | BRADFORD, White, AR | Pass | State |
| 2026-08-12 | DESOTO GATHERING COMPANY, LLC - TIGER CPF-1 | BRADFORD, White, AR | Pass | State |
| 2026-08-12 | PDC ENERGY - CHANDLER FARMS HD PAD | JOHNSTOWN AREA, Weld, CO | Pass | State |
| 2026-08-12 | FLORIDA ROCK INDUSTRIES, INC. | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-08-12 | JAMES HARDIE BUILDING PRODUCTS, INC. — high-priority violation on file | PLANT CITY, Hillsborough, FL | Pass | State |
| 2026-08-12 | JAMES HARDIE BUILDING PRODUCTS, INC. — high-priority violation on file | PLANT CITY, Hillsborough, FL | Pass | State |
| 2026-08-12 | SANTA ROSA ENERGY CTR, LLC | PACE, Santa Rosa, FL | Pass | State |
| 2026-08-12 | SANTA ROSA ENERGY CTR, LLC | PACE, Santa Rosa, FL | Pass | State |
| 2026-08-12 | MID-GEORGIA COGEN LP | KATHLEEN, Houston, GA | Pass | State |
| 2026-08-12 | EXXON MOBIL OIL CORP — high-priority violation on file | CHANNAHON, Will, IL | Pass | State |
| 2026-08-12 | DOLCO PACKAGING CORPORATION | DECATUR, Adams, IN | Pass | State |
| 2026-08-12 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-08-12 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-08-12 | U S STEEL MIDWEST PLANT | PORTAGE, Porter, IN | Pass | State |
| 2026-08-12 | JUPITER ALUMINUM CORPORATION FAIRLAND COIL COATING | FAIRLAND, Shelby, IN | Pass | State |
| 2026-08-12 | SABETHA MUN. POWER PLANT (AIR) | SABETHA, Nemaha, KS | Pass | State |
| 2026-08-12 | SABETHA MUN. POWER PLANT (AIR) | SABETHA, Nemaha, KS | Pass | State |
| 2026-08-12 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-08-12 | DTE ELECTRIC COMPANY - PLACID PEAKING FACILITY | CLARKSTON, Oakland, MI | Pass | State |
| 2026-08-12 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pending | State |
| 2026-08-12 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pending | State |
| 2026-08-12 | MAYMEAD, INC. - MT AIRY PLANT — high-priority violation on file | MOUNT AIRY, Surry, NC | Pending | State |
| 2026-08-12 | PLATTE GENERATING STATION | GRAND ISLAND, Hall, NE | N/A | State |
| 2026-08-12 | DOGTOWN COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-08-12 | AMERICAN NITRILE GROVE CITY — high-priority violation on file | GROVE CITY, Franklin, OH | Pass | State |
| 2026-08-12 | AMERICAN NITRILE GROVE CITY — high-priority violation on file | GROVE CITY, Franklin, OH | Pass | State |
| 2026-08-12 | GREAT SAND LLC THOMPSON — high-priority violation on file | THOMPSON, TOWNSHIP OF, Geauga, OH | Pass | State |
| 2026-08-12 | GREAT SAND LLC THOMPSON — high-priority violation on file | THOMPSON, TOWNSHIP OF, Geauga, OH | Pass | State |
| 2026-08-12 | BLACKHILL ENERGY LLC/YOUNG COMP STA — high-priority violation on file | COLUMBIA CROSS ROADS, Bradford, PA | Pass | State |
| 2026-08-12 | EXPAND OPERATING LLC/RU-75 SGL-A WELLPAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-08-12 | EXPAND OPERATING LLC/RU-75 SGL-A WELLPAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-08-12 | NUCOR STEEL | PLYMOUTH, Box Elder, UT | Pass | State |
| 2026-08-12 | PUGET SOUND ENERGY - ENCOGEN | BELLINGHAM, Whatcom, WA | Pass | Local |
| 2026-08-12 | WISCONSIN ELECTRIC POWER COMPANY (DBA WE ENERGIES) - ROTHSCHILD BIOMASS COGENERA — high-priority violation on file | ROTHSCHILD, Marathon, WI | Pass | State |
| 2026-08-12 | CHEYENNE PLANT (DYNO NOBEL INC) — high-priority violation on file | CHEYENNE, Laramie, WY | Pass | State |
| 2026-08-12 | CHEYENNE PLANT (DYNO NOBEL INC) — high-priority violation on file | CHEYENNE, Laramie, WY | Pass | State |
| 2026-08-12 | CHEYENNE PLANT (DYNO NOBEL INC) — high-priority violation on file | CHEYENNE, Laramie, WY | Pass | State |
| 2026-08-11 | CITGO PETROLEUM CORP. | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-08-11 | CITGO PETROLEUM CORP. | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-08-11 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-3 | SPRINGFIELD, Conway, AR | Pass | State |
| 2026-08-11 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-3 | SPRINGFIELD, Conway, AR | Pass | State |
| 2026-08-11 | PROCTER & GAMBLE | SACRAMENTO, Sacramento, CA | Pending | Local |
| 2026-08-11 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-11 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-11 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-11 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-11 | H. J. HEINZ COMPANY, L.P. | ESCALON, San Joaquin, CA | Pass | Local |
| 2026-08-11 | H. J. HEINZ COMPANY, L.P. | ESCALON, San Joaquin, CA | Fail | Local |
| 2026-08-11 | BONANZA CREEK ENERGY - ANTELOPE SECTION | KERSEY 9.2 MI. E OF, Weld, CO | Pass | State |
| 2026-08-11 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-08-11 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-08-11 | HOMESTEAD ENERGY SERVICES | HOMESTEAD, Miami-Dade, FL | Pass | State |
| 2026-08-11 | HOMESTEAD ENERGY SERVICES | HOMESTEAD, Miami-Dade, FL | Pass | State |
| 2026-08-11 | CMC STEEL US, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-08-11 | CMC STEEL US, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-08-11 | CMC STEEL US, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-08-11 | CMC STEEL US, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-08-11 | CMC STEEL US, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-08-11 | CMC STEEL US, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-08-11 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-08-11 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in 2026. It lists 11,110 stack tests recorded nationwide in 2026.