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 |
|---|---|---|---|---|
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-27 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW | CENTER RIDGE, Conway, AR | Pass | State |
| 2025-10-27 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-10-27 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-27 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-27 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2025-10-27 | RIVER ROCK OPERATING - FIRESIDE STATION (AIR) | ALTOONA, Wilson, KS | Pass | State |
| 2025-10-27 | ND PAPER INC. | RUMFORD, Oxford, ME | Pass | State |
| 2025-10-27 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-27 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-27 | GCF US HOLDINGS, LLC - COLUMBUS MILL — high-priority violation on file | COLUMBUS, Lowndes, MS | Pass | State |
| 2025-10-27 | C & H NORRIS CONSTRUCTION COMPANY, INC. | TABOR CITY, Columbus, NC | Pass | State |
| 2025-10-27 | ACE STERN VEGAS FACILITY | LOVING, Eddy, NM | Pass | State |
| 2025-10-27 | MICHAEL RYAN TB | LIVINGSTON WHEELER, Eddy, NM | Pass | State |
| 2025-10-27 | SHUGART COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2025-10-27 | SHUGART COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2025-10-27 | PICANTE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-27 | PICANTE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-27 | PICANTE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-27 | PICANTE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-27 | HYPERION A CTB | JAL, Lea, NM | Pass | State |
| 2025-10-27 | GOLDEN TEE CTB | EUNICE, Lea, NM | Pass | State |
| 2025-10-27 | PROMETHEUS A CTB | JAL, Lea, NM | Pass | State |
| 2025-10-27 | FORKARDT HARDINGE INC | HORSEHEADS, Chemung, NY | Pass | State |
| 2025-10-27 | TUSCARORA COMPRESSOR STATION | TUSCARORA, Steuben, NY | Pass | State |
| 2025-10-27 | INV NYLON CHEMICALS AMERICAS ORANGE SITE — high-priority violation on file | ORANGE, Orange, TX | Pass | State |
| 2025-10-27 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-27 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-27 | WISCONSIN ELECTRIC POWER COMPANY D/B/A WE ENERGIES-PARIS GENERATING STATION | UNION GROVE, Kenosha, WI | Pass | State |
| 2025-10-27 | WISCONSIN ELECTRIC POWER COMPANY D/B/A WE ENERGIES-PARIS GENERATING STATION | UNION GROVE, Kenosha, WI | Pass | State |
| 2025-10-27 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-27 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-27 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-26 | MID-CONTINENT COAL AND COKE COMPANY | HUGER, Berkeley, SC | Pass | State |
| 2025-10-25 | LA CITY DWP- VALLEY GENERATING STN | SUN VALLEY, Los Angeles, CA | Pass | Local |
| 2025-10-25 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-25 | IKE WILLIAMSON SAND PIT, ACB | SHALLOTTE, Brunswick, NC | Pass | State |
| 2025-10-25 | FLOWERS BAKING CO/OXFORD PLT — high-priority violation on file | OXFORD, Chester, PA | Pass | State |
| 2025-10-24 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2025-10-24 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2025-10-24 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2025-10-24 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2025-10-24 | ALTERNATIVE WASTE MANAGEMENT LLC | MAYFLOWER, Faulkner, AR | Pass | State |
| 2025-10-24 | CMC STEEL FABRICATORS | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-10-24 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-10-24 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Fail | Local |
| 2025-10-24 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Fail | Local |
| 2025-10-24 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Fail | Local |
| 2025-10-24 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Fail | Local |
| 2025-10-24 | UNIVERSITY OF CONNECTICUT STORRS CAMPUS | MANSFIELD DEPOT, Tolland, CT | Pass | State |
| 2025-10-24 | UNIVERSITY OF CONNECTICUT STORRS CAMPUS | MANSFIELD DEPOT, Tolland, CT | Pass | State |
| 2025-10-24 | STERILIZATION SERVICES OF GEORGIA | ATLANTA, Fulton, GA | Pass | State |
| 2025-10-24 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2025-10-24 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2025-10-24 | AMRIZE CEMENT INC | BLOOMSDALE, Ste. Genevieve, MO | Pending | State |
| 2025-10-24 | AMRIZE CEMENT INC | BLOOMSDALE, Ste. Genevieve, MO | Pass | State |
| 2025-10-24 | AMRIZE CEMENT INC | BLOOMSDALE, Ste. Genevieve, MO | Pass | State |
| 2025-10-24 | AMRIZE CEMENT INC | BLOOMSDALE, Ste. Genevieve, MO | N/A | State |
| 2025-10-24 | AMRIZE CEMENT INC | BLOOMSDALE, Ste. Genevieve, MO | Pass | State |
| 2025-10-24 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Fail | State |
| 2025-10-24 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-24 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-24 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-24 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-24 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-24 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2025-10-24 | CAROLINA TREE AND LANDSCAPING | SUPPLY, Brunswick, NC | Pass | State |
| 2025-10-24 | ROCCO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-24 | ROCCO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-24 | OCOTILLO SUNRISE TANK BATTERY | JAL, Lea, NM | Pass | State |
| 2025-10-24 | QUEEN KEELY CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-10-24 | MATALCO USA LLC | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-10-24 | MATALCO USA LLC | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-10-24 | MATALCO USA LLC | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-10-24 | CLEVELAND STEEL CONTAINER/QUAKERTOWN | QUAKERTOWN, Bucks, PA | Pass | State |
| 2025-10-24 | DIVERSIFIED PROD LLC/NV 60 WELLPAD | CLAYSVILLE, Washington, PA | Pass | State |
| 2025-10-24 | CAROLINA PALLETS & RECYCLING — high-priority violation on file | BELTON, Anderson, SC | Pass | State |
| 2025-10-24 | MUELLER CO. LLC — high-priority violation on file | CHATTANOOGA, Hamilton, TN | Pass | Local |
| 2025-10-24 | BASF TOTAL FINA NAFTA REGION OLEFINS COMPLEX — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-10-24 | BASF TOTAL FINA NAFTA REGION OLEFINS COMPLEX — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-10-24 | BASF TOTAL FINA NAFTA REGION OLEFINS COMPLEX — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-10-24 | BASF TOTAL FINA NAFTA REGION OLEFINS COMPLEX — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-10-24 | BASF TOTAL FINA NAFTA REGION OLEFINS COMPLEX — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-10-24 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-24 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-24 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.