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 |
|---|---|---|---|---|
| 2025-11-06 | METRO METHANE RECOVERY | MITCHELLVILLE, Polk, IA | Pass | Local |
| 2025-11-06 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Fail | Local |
| 2025-11-06 | ILLINOIS CEMENT CO | LASALLE, La Salle, IL | Pass | State |
| 2025-11-06 | PERRY RIDGE LANDFILL | DU QUOIN, Perry, IL | Pass | State |
| 2025-11-06 | HAYNES INTERNATIONAL INC — high-priority violation on file | KOKOMO, Howard, IN | Pass | State |
| 2025-11-06 | STARPLUS ENERGY LLC | KOKOMO, Howard, IN | Pass | State |
| 2025-11-06 | GLWA WATER RESOURCE RECOVERY FACILITY | DETROIT, Wayne, MI | Pass | State |
| 2025-11-06 | FCA US LLC - CHRYSLER TECHNOLOGY CENTER | AUBURN HILLS, Oakland, MI | Pass | State |
| 2025-11-06 | BADGER FOUNDRY COMPANY | WINONA, Winona, MN | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | RAY COUNTY STONE (PORT-0933) | PORTABLE, Undetermined, MO | Pass | State |
| 2025-11-06 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pass | State |
| 2025-11-06 | HILAND PARTNERS HOLDINGS LLC - WATFORD CITY GAS PLANT - AQ | ALEXANDER, McKenzie, ND | Pass | State |
| 2025-11-06 | OMAHA STEEL CASTINGS CO — high-priority violation on file | WAHOO, Saunders, NE | N/A | State |
| 2025-11-06 | ENTERPRISE - OXY SAND DUNES CENTRAL COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-06 | VANDELAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-06 | SNEAKY SNAKE 24 CTB 1 | MALAGA, Lea, NM | Pass | State |
| 2025-11-06 | MAESTRO COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-06 | OVER THE LINE COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-11-06 | GRAND RIVER DAM AUTHORITY / GRAND RIVER ENERGY CENTER — high-priority violation on file | CHOUTEAU, Mayes, OK | Pass | State |
| 2025-11-06 | EXPAND OPERATING LLC/INNES PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-11-06 | CRANE, J PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pending | State |
| 2025-11-06 | DIAZ FAMILY, LP PAD 2 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-11-06 | HUB CITY ENERGY, LLC — high-priority violation on file | ABERDEEN, Brown, SD | Pass | State |
| 2025-11-06 | HUB CITY ENERGY, LLC — high-priority violation on file | ABERDEEN, Brown, SD | Pass | State |
| 2025-11-06 | TENNESSEE VALLEY AUTHORITY - GALLATIN FOSSIL PLANT | GALLATIN, Sumner, TN | Pass | State |
| 2025-11-06 | US NAVY - NAVAL STATION NORFOLK | NORFOLK, Norfolk (city), VA | Pass | State |
| 2025-11-06 | KAISER ALUMINUM WASHINGTON, LLC | SPOKANE, Spokane, WA | Pass | Local |
| 2025-11-06 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2025-11-06 | DTM APPALACHIA GATHERING, LLC, MEPCO COMPRESSOR | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2025-11-06 | EASTERN GAS TRANSMISSION AND STORAGE, INC., MOCKINGBIRD HILL | PINE GROVE, Wetzel, WV | Pass | State |
| 2025-11-06 | PAINTER COMPRESSOR STATION (KERN RIVER GAS TRANSMISSION) | EVANSTON, Uinta, WY | Pass | State |
| 2025-11-06 | PAINTER COMPRESSOR STATION (KERN RIVER GAS TRANSMISSION) | EVANSTON, Uinta, WY | Pass | State |
| 2025-11-05 | FREEBIRD GAS STORAGE | DETROIT, Lamar, AL | Pass | State |
| 2025-11-05 | NUCOR STEEL DECATUR LLC | TRINITY, Morgan, AL | Pass | State |
| 2025-11-05 | NUCOR STEEL DECATUR LLC | TRINITY, Morgan, AL | Pass | State |
| 2025-11-05 | DESOTO GATHERING COMPANY, LLC - SHARKEY CPF-1 | JUDSONIA, White, AR | Pass | State |
| 2025-11-05 | DESOTO GATHERING COMPANY, LLC - MAKO CPF-1 | PANGBURN, White, AR | Pass | State |
| 2025-11-05 | DELTA ASPHALT OF ARKANSAS, INC. | OSCEOLA, Mississippi, AR | Pass | State |
| 2025-11-05 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-11-05 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-11-05 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-11-05 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-11-05 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2025-11-05 | GLANBIA NUTRITIONALS (NA) INC. — high-priority violation on file | WEST HAVEN, New Haven, CT | Pass | State |
| 2025-11-05 | OLEANDER POWER PROJECT, LP | COCOA, Brevard, FL | Pass | State |
| 2025-11-05 | OLEANDER POWER PROJECT, LP | COCOA, Brevard, FL | Pass | State |
| 2025-11-05 | SEAPORT CANAVERAL CORP. | CAPE CANAVERAL, Brevard, FL | Pass | State |
| 2025-11-05 | CENTER POINT TERMINAL J&W, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-11-05 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-05 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-05 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-05 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-05 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-05 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-05 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-05 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-05 | BREITBURN OPERATING LP — high-priority violation on file | JAY, Santa Rosa, FL | Pass | State |
| 2025-11-05 | DUKE ENERGY FLORIDA, LLC | DE BARY-ORANGE CITY DIVISION, Volusia, FL | Pass | State |
| 2025-11-05 | DUKE ENERGY FLORIDA, LLC | DE BARY-ORANGE CITY DIVISION, Volusia, FL | Pass | State |
| 2025-11-05 | ARCH WOOD PROTECTION, INC. — high-priority violation on file | CONLEY, DeKalb, GA | Pass | State |
| 2025-11-05 | VULCAN CONSTRUCTION MATERIALS, LLC - SILOAM QUARRY | SILOAM, Greene, GA | Pass | State |
| 2025-11-05 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2025-11-05 | MECO - MAALAEA | MAALAEA, Maui, HI | Pass | State |
| 2025-11-05 | JOHN DEERE PRODUCT ENGINEERING CENTER | CEDAR FALLS, Black Hawk, IA | Pass | State |
| 2025-11-05 | MILNER BUTTE LANDFILL | BURLEY, Cassia, ID | Pass | State |
| 2025-11-05 | STARPLUS ENERGY LLC | KOKOMO, Howard, IN | Pass | State |
| 2025-11-05 | STARPLUS ENERGY LLC | KOKOMO, Howard, IN | Pass | State |
| 2025-11-05 | STARPLUS ENERGY LLC | KOKOMO, Howard, IN | Pass | State |
| 2025-11-05 | STARPLUS ENERGY LLC | KOKOMO, Howard, IN | Pass | State |
| 2025-11-05 | ALUMINUM RECOVERY TECHNOLOGIES LTD | KENDALLVILLE, Noble, IN | Pass | State |
| 2025-11-05 | ALUMINUM RECOVERY TECHNOLOGIES LTD | KENDALLVILLE, Noble, IN | Pass | State |
| 2025-11-05 | ALUMINUM RECOVERY TECHNOLOGIES LTD | KENDALLVILLE, Noble, IN | Pass | State |
| 2025-11-05 | ALUMINUM RECOVERY TECHNOLOGIES LTD | KENDALLVILLE, Noble, IN | Pass | State |
| 2025-11-05 | ALUMINUM RECOVERY TECHNOLOGIES LTD | KENDALLVILLE, Noble, IN | Pass | State |
| 2025-11-05 | ALUMINUM RECOVERY TECHNOLOGIES LTD | KENDALLVILLE, Noble, IN | Pass | State |
| 2025-11-05 | SCHMIDT BAKING | NOTTINGHAM, Baltimore, MD | Pass | State |
| 2025-11-05 | TRANSCONTINENTAL GAS PIPELINE | ELLICOTT CITY, Howard, MD | Pass | State |
| 2025-11-05 | INDECK NILES LLC | NILES, Cass, MI | Pass | State |
| 2025-11-05 | ENERGY DEVELOPMENTS BYRON CENTER, LLC | BYRON CENTER, Kent, MI | Pass | State |
| 2025-11-05 | AMERICAN CRYSTAL SUGAR - MOORHEAD — high-priority violation on file | MOORHEAD, Clay, MN | Pass | State |
| 2025-11-05 | ADM - MARSHALL | MARSHALL, Lyon, MN | Pass | State |
| 2025-11-05 | VETERANS AFFAIRS MEDICAL CENTER | ASHEVILLE, Buncombe, NC | Pass | Local |
| 2025-11-05 | OPPD NEBRASKA CITY STATION | NEBRASKA CITY, Otoe, NE | N/A | State |
| 2025-11-05 | ENTERPRISE - OXY SAND DUNES CENTRAL COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-05 | ENTERPRISE - OXY SAND DUNES CENTRAL COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-05 | BOROS WEST FACILITY — high-priority violation on file | MALAGA, Eddy, NM | Pass | State |
| 2025-11-05 | PHOENIX COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.