EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,633Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,448
- Ohio 2,217
- New Mexico 1,801
- Indiana 1,621
- Florida 1,425
- Wyoming 1,362
- Georgia 1,234
- Oklahoma 1,229
- Pennsylvania 957
- Missouri 772
- Alabama 693
- Mississippi 689
- Arkansas 619
- Iowa 500
- Colorado 405
- Kansas 404
- Michigan 387
- Texas 308
- North Carolina 276
- Illinois 264
- Washington 263
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 207
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 157
- North Dakota 152
- Nebraska 145
- Maine 131
- Louisiana 129
- New York 126
- Arizona 116
- Idaho 111
- Nevada 75
- New Hampshire 59
- Massachusetts 59
- Hawaii 58
- Oregon 56
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- New Jersey 11
- Vermont 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-11-25 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-11-25 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-11-25 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-11-25 | MID-STATES MATERIALS (MASTER EQUIP LIST 2) (AIR) | TOPEKA, Wallace, KS | Pass | State |
| 2025-11-25 | MID-STATES MATERIALS (MASTER EQUIP LIST 2) (AIR) | TOPEKA, Wallace, KS | Pass | State |
| 2025-11-25 | ND PAPER INC. | RUMFORD, Oxford, ME | Pass | State |
| 2025-11-25 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2025-11-25 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2025-11-25 | BUSHMILLS ETHANOL INC | ATWATER, Kandiyohi, MN | Pass | State |
| 2025-11-25 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2025-11-25 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2025-11-25 | DUKE ENERGY PROGRESS, LLC - RICHMOND COUNTY TURBINES | HAMLET, Richmond, NC | Pending | State |
| 2025-11-25 | ASTRODOG PAD S | MALAGA, Eddy, NM | Pass | State |
| 2025-11-25 | WAYNE GAYLORD TB | LA HUERTA, Eddy, NM | Pass | State |
| 2025-11-25 | WAYNE GAYLORD TB | LA HUERTA, Eddy, NM | Pass | State |
| 2025-11-25 | TITAN TREATER PLANT NO1 | JAL, Lea, NM | Pass | State |
| 2025-11-25 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-11-25 | IGGLES TB | MONUMENT, Lea, NM | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | LINDY PAVING/WHEATLAND ASPHALT PLT | WHEATLAND, Mercer, PA | Pass | State |
| 2025-11-25 | ETC NORTHEAST PIPELINE LLC/BARTO COMP STA | HUGHESVILLE, Lycoming, PA | Pass | State |
| 2025-11-25 | NFG MIDSTREAM TROUT RUN LLC/TROUT RUN MTN COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-11-25 | TOWN OF WINNSBORO - ELECTRICAL DIVISION | WINNSBORO, Fairfield, SC | Pass | State |
| 2025-11-25 | REDFIELD ENERGY LLC — high-priority violation on file | REDFIELD, Beadle, SD | Pass | State |
| 2025-11-25 | AMERICAN SNUFF COMPANY, LLC | CLARKSVILLE, Montgomery, TN | Pass | State |
| 2025-11-25 | CARLEX GLASS AMERICA, LLC - NASHVILLE GLASS PLANT | NASHVILLE, Davidson, TN | Pass | Local |
| 2025-11-25 | TESORO WEST COAST/FORMER BP AMOCO | SALT LAKE CITY, Salt Lake, UT | Pass | State |
| 2025-11-25 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-25 | PUGET SOUND ENERGY-FREDONIA | MOUNT VERNON, Skagit, WA | Pass | Local |
| 2025-11-25 | QUAD/GRAPHICS INC | SUSSEX, Waupaca, WI | Pass | State |
| 2025-11-25 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Pass | State |
| 2025-11-25 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Pass | State |
| 2025-11-24 | FREEPORT MCMORAN - MIAMI SMELTER | MIAMI, Gila, AZ | Pass | State |
| 2025-11-24 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-24 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-24 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-24 | WESTERN CONSTRUCTION 00098 | BOISE, Ada, ID | Pass | State |
| 2025-11-24 | WESTERN CONSTRUCTION 00604 | BOISE, Ada, ID | Pass | State |
| 2025-11-24 | WESTERN CONSTRUCTION 00605 | BOISE, Ada, ID | Pass | State |
| 2025-11-24 | WESTERN CONSTRUCTION INC 00680 | BOISE, Ada, ID | Pass | State |
| 2025-11-24 | WESTERN CONSTRUCTION INC 00682 | BOISE, Ada, ID | Pass | State |
| 2025-11-24 | WESTERN CONSTRUCTION INC 00683 | BOISE, Ada, ID | Pass | State |
| 2025-11-24 | DUKE ENERGY INDIANA LLC EDWARDSPORT GENERATING STATION | EDWARDSPORT, Knox, IN | Pass | State |
| 2025-11-24 | DUKE ENERGY INDIANA LLC EDWARDSPORT GENERATING STATION | EDWARDSPORT, Knox, IN | Pass | State |
| 2025-11-24 | AMERICAN CRYSTAL SUGAR - EAST GRAND FORKS | EAST GRAND FORKS, Polk, MN | Pass | State |
| 2025-11-24 | ME GLOBAL INC | DULUTH, St. Louis, MN | Pass | State |
| 2025-11-24 | CARGILL, INC. | KANSAS CITY, Jackson, MO | Pass | State |
| 2025-11-24 | CARGILL, INC. | KANSAS CITY, Jackson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-11-24 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-11-24 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-11-24 | ENTERPRISE - OXY SAND DUNES CENTRAL COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-24 | DIMENSIONS 6 SECTION 8 GAS SALES COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-24 | CASSIUS PAD W | LOVING, Eddy, NM | Pass | State |
| 2025-11-24 | MAMA JO TB | LOVING, Eddy, NM | Pass | State |
| 2025-11-24 | MAMA JO TB | LOVING, Eddy, NM | Pass | State |
| 2025-11-24 | ELECTRA SPECIAL TB | MONUMENT, Lea, NM | Pass | State |
| 2025-11-24 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-11-24 | ETC NORTHEAST PIPELINE LLC/RED BEND COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-11-24 | THE ESPOMA CO/FRAILEY TWP — high-priority violation on file | HEGINS, Schuylkill, PA | Pending | State |
| 2025-11-24 | EMPET, D. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-11-24 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | N/A | State |
| 2025-11-24 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-24 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Pass | State |
| 2025-11-23 | HELCO - PUNA | KEAAU, Hawaii, HI | Pass | State |
| 2025-11-23 | EOG - EL JEFE LGL STATION | JAL, Lea, NM | Pass | State |
| 2025-11-22 | EOG - ODIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-21 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2025-11-21 | USMC - YERMO LOGISTICS CNTR | BARSTOW, San Bernardino, CA | Pass | Local |
| 2025-11-21 | CERTAINTEED CORP — high-priority violation on file | CHOWCHILLA, Madera, CA | Pass | Local |
| 2025-11-21 | CERTAINTEED CORP — high-priority violation on file | CHOWCHILLA, Madera, CA | Pass | Local |
| 2025-11-21 | CERTAINTEED CORP — high-priority violation on file | CHOWCHILLA, Madera, CA | Pass | Local |
| 2025-11-21 | SUNIVA, INC. | NORCROSS, Gwinnett, GA | 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 and stack tests in 2025. It lists 26,291 stack tests recorded nationwide in 2025.