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 |
|---|---|---|---|---|
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | FOSTER FOOD PRODUCTS — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2025-11-07 | FOSTER FOOD PRODUCTS — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2025-11-07 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Fail | Local |
| 2025-11-07 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Fail | Local |
| 2025-11-07 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Fail | Local |
| 2025-11-07 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Fail | Local |
| 2025-11-07 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Fail | Local |
| 2025-11-07 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Fail | Local |
| 2025-11-07 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Fail | Local |
| 2025-11-07 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Fail | Local |
| 2025-11-07 | OLEANDER POWER PROJECT, LP | COCOA, Brevard, FL | Pass | State |
| 2025-11-07 | OLEANDER POWER PROJECT, LP | COCOA, Brevard, FL | Pass | State |
| 2025-11-07 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2025-11-07 | MECO - MAALAEA | MAALAEA, Maui, HI | Pass | State |
| 2025-11-07 | NORTHERN INDIANA PUBLIC SERVICE COMPANY LLC MICHIGAN CITY GE — high-priority violation on file | MICHIGAN CITY, LaPorte, IN | Pass | State |
| 2025-11-07 | NORTHERN INDIANA PUBLIC SERVICE COMPANY LLC MICHIGAN CITY GE — high-priority violation on file | MICHIGAN CITY, LaPorte, IN | Pass | State |
| 2025-11-07 | NORTHERN INDIANA PUBLIC SERVICE COMPANY LLC MICHIGAN CITY GE — high-priority violation on file | MICHIGAN CITY, LaPorte, IN | Pass | State |
| 2025-11-07 | NORTHERN INDIANA PUBLIC SERVICE COMPANY LLC MICHIGAN CITY GE — high-priority violation on file | MICHIGAN CITY, LaPorte, IN | Pass | State |
| 2025-11-07 | BETTIS ASPHALT - BAC - PP4 (AIR) | TOPEKA, Shawnee, KS | Pass | State |
| 2025-11-07 | DOW SILICONES CORPORATION | MIDLAND, Midland, MI | Pass | State |
| 2025-11-07 | FORD MOTOR COMPANY WAYNE COMPLEX | WAYNE, Wayne, MI | Pass | State |
| 2025-11-07 | FSC II, LLC - MURFREESBORO ASPHALT PLANT | COMO, Hertford, NC | Pass | State |
| 2025-11-07 | GATO GRANDE 16 CTB 1 | MALAGA, Lea, NM | Pass | State |
| 2025-11-07 | GATO GRANDE 16 CTB 1 | MALAGA, Lea, NM | Pass | State |
| 2025-11-07 | OVER THE LINE COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-11-07 | BOREALIS MINE | HAWTHORNE, Mineral, NV | Fail | State |
| 2025-11-07 | CARBON LIMESTONE SANITARY LANDFILL | LOWELLVILLE, Mahoning, OH | Pass | State |
| 2025-11-07 | CARBON LIMESTONE SANITARY LANDFILL | LOWELLVILLE, Mahoning, OH | Pass | State |
| 2025-11-07 | HEIDELBERG MTLS NORTHEAST PA/PENNS PARK PLT — high-priority violation on file | PENNS PARK, Bucks, PA | Pass | State |
| 2025-11-07 | HAMILTON LIBERTY LLC/HAMILTON LIBERTY LLC — high-priority violation on file | WYSOX, Bradford, PA | Pass | State |
| 2025-11-07 | ISA WELL SITE — high-priority violation on file | COGAN STATION, Lycoming, PA | Pass | State |
| 2025-11-07 | UCC SEADRIFT OPERATIONS | SEADRIFT, Calhoun, TX | N/A | State |
| 2025-11-07 | COLETO CREEK POWER STATION | FANNIN, Goliad, TX | Pass | State |
| 2025-11-07 | CITGO CORPUS CHRISTI REFINERY WEST PLANT | CORPUS CHRISTI, Nueces, TX | Pass | State |
| 2025-11-07 | GULF COAST GROWTH VENTURES PROJECT | GREGORY, San Patricio, TX | Pass | State |
| 2025-11-07 | GULF COAST GROWTH VENTURES PROJECT | GREGORY, San Patricio, TX | Pass | State |
| 2025-11-07 | GULF COAST GROWTH VENTURES PROJECT | GREGORY, San Patricio, TX | Pass | State |
| 2025-11-07 | GULF COAST GROWTH VENTURES PROJECT | GREGORY, San Patricio, TX | Pass | State |
| 2025-11-07 | DOMINION/ODEC - CLOVER POWER STATION — high-priority violation on file | CLOVER, Halifax, VA | Pass | State |
| 2025-11-07 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
| 2025-11-07 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
| 2025-11-06 | TESORO ALASKA COMPANY, LLC / KENAI REFINERY — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2025-11-06 | TESORO ALASKA COMPANY, LLC / KENAI REFINERY — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2025-11-06 | BROOKLYN PPC, LLC | EVERGREEN, Conecuh, AL | Pass | State |
| 2025-11-06 | DESOTO GATHERING COMPANY LLC - CHARLEY CPF-3 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2025-11-06 | TOPOCK LNG PLANT 1 COOLING WATER BLOWDOWN POND | TOPOCK, Mohave, AZ | Pass | State |
| 2025-11-06 | BLYTHE ENERGY LLC (FPL FLORIDA POWER) | BLYTHE, Riverside, CA | Pass | Local |
| 2025-11-06 | PACIFIC BELL TELEPHONE CO (DBA AT&T CA) | FRESNO, Fresno, CA | Pass | Local |
| 2025-11-06 | PACIFIC BELL TELEPHONE CO (DBA AT&T CA) | FRESNO, Fresno, CA | Pass | Local |
| 2025-11-06 | PACIFIC BELL TELEPHONE CO (DBA AT&T CA) | FRESNO, Fresno, CA | Pass | Local |
| 2025-11-06 | SIMI VALLEY LANDFILL & RECYCLING CENTER — high-priority violation on file | SIMI VALLEY, Ventura, CA | Pass | Local |
| 2025-11-06 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-11-06 | CENTER POINT TERMINAL J&W, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-11-06 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2025-11-06 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2025-11-06 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-06 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-06 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-06 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-06 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-06 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-06 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-06 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | N/A | State |
| 2025-11-06 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2025-11-06 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2025-11-06 | CELLOFOAM NORTH AMERICA, INC. | CONYERS, Rockdale, GA | Pass | State |
| 2025-11-06 | HECO - WAIAU | PEARL CITY, Honolulu, HI | Pass | State |
| 2025-11-06 | NORTHERN NATURAL GAS CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-11-06 | NEW HAMPTON MUNICIPAL LIGHT & POWER | NEW HAMPTON, Chickasaw, IA | Pass | State |
| 2025-11-06 | MARTIN MARIETTA INC-FORT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2025-11-06 | METRO METHANE RECOVERY | MITCHELLVILLE, Polk, IA | Pass | Local |
| 2025-11-06 | METRO METHANE RECOVERY | MITCHELLVILLE, Polk, IA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.