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 |
|---|---|---|---|---|
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | BASF CORPORATION — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2025-11-12 | MIDDLETOWN COKE COMPANY, LLC — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2025-11-12 | PEOPLES NATURAL GAS CO LLC/ROARING RUN STA | APOLLO, Armstrong, PA | Pass | State |
| 2025-11-12 | TEXAS EASTERN TRANS LP/PERULACK STA | EAST WATERFORD, Juniata, PA | Pass | State |
| 2025-11-12 | LANCASTER CNTY SWMA/SUSQ RESOURCE MGMT COMPLEX — high-priority violation on file | HARRISBURG, Dauphin, PA | Pass | State |
| 2025-11-12 | JANSSEN RESEARCH & DEVELOPMENT LLC/LOWER GWYNEDD | SPRING HOUSE, Montgomery, PA | Pass | State |
| 2025-11-12 | COLUMBIA GAS TRANS CORP/WAYNESBURG COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-11-12 | LPR ENERGY LLC/HENRY CLAY MIDSTREAM FAC | MARKLEYSBURG, Fayette, PA | Pass | State |
| 2025-11-12 | WILLIAMS FIELD SVC CO LLC/CHURCH COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-11-12 | EQUITRANS LP/REDHOOK COMPRESSOR STATION | WAYNESBURG, Greene, PA | Pass | State |
| 2025-11-12 | PA GEN ENERGY CO LLC/REED RUN STILL PAD A COMP STA — high-priority violation on file | SMETHPORT, McKean, PA | Pass | State |
| 2025-11-12 | FIRST QUALITY PRINT & PACKAGING LLC (FQP&P LLC) | ANDERSON, Anderson, SC | Pass | State |
| 2025-11-12 | GLACIAL LAKES ENERGY LLC | WATERTOWN, Codington, SD | Pass | State |
| 2025-11-12 | ALLIED METAL CO. | CHATTANOOGA, Hamilton, TN | Pass | Local |
| 2025-11-12 | KOPPERS PERFORMANCE CHEMICAL | MILLINGTON, Shelby, TN | Pass | Local |
| 2025-11-12 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-12 | GRASSLAND DAIRY PRODUCTS INC | GREENWOOD, Clark, WI | Pass | State |
| 2025-11-12 | SAINT-GOBAIN CERAMICS & PLASTICS, INC., BUCKHANNO — high-priority violation on file | BUCKHANNON, Upshur, WV | Fail | State |
| 2025-11-12 | ANTERO MIDSTREAM LLC, GRAYS PEAK CS | READER, Wetzel, WV | Pass | State |
| 2025-11-12 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-11-12 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-11-12 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-12 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-12 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-12 | EAKIN COMPRESSOR STATION (MOUNTAIN WEST PIPELINE, LLC) | UINTA COUNTY, Uinta, WY | Pass | State |
| 2025-11-12 | EAKIN COMPRESSOR STATION (MOUNTAIN WEST PIPELINE, LLC) | UINTA COUNTY, Uinta, WY | Pass | State |
| 2025-11-11 | SALINAS VALLEY SOLID WASTE AUTHORITY | GONZALES, Monterey, CA | Pass | Local |
| 2025-11-11 | PHILLIPS 66 CO/LA REFINERY WILMINGTON — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-11-11 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-11 | CRESTONE PEAK - GRANDE 4-65 20-19 NORTH | AURORA, Arapahoe, CO | Pass | State |
| 2025-11-11 | CRESTONE PEAK - GRANDE 4-65 20-19 NORTH | AURORA, Arapahoe, CO | Pass | State |
| 2025-11-11 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-11-11 | FLORIDA POWER & LIGHT COMPANY (PCC) | COCOA, Brevard, FL | Pass | State |
| 2025-11-11 | GEORGIA PACIFIC WOOD PRODUCTS LLC | HOSFORD, Liberty, FL | Pass | State |
| 2025-11-11 | GEORGIA PACIFIC WOOD PRODUCTS LLC | HOSFORD, Liberty, FL | Pass | State |
| 2025-11-11 | GEORGIA PACIFIC WOOD PRODUCTS LLC | HOSFORD, Liberty, FL | Pass | State |
| 2025-11-11 | GEORGIA PACIFIC WOOD PRODUCTS LLC | HOSFORD, Liberty, FL | Pass | State |
| 2025-11-11 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-11 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-11 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-11 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-11 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-11 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-11 | CONCORDE/INTERSPACE BATTERY GEORGIA CORPORATION | AUSTELL, Cobb, GA | Pass | State |
| 2025-11-11 | CONCORDE/INTERSPACE BATTERY GEORGIA CORPORATION | AUSTELL, Cobb, GA | Pass | State |
| 2025-11-11 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-11-11 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-11-11 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-11-11 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-11-11 | ARGLASS YAMAMURA SE, LLC — high-priority violation on file | VALDOSTA, Lowndes, GA | Fail | State |
| 2025-11-11 | ARGLASS YAMAMURA SE, LLC — high-priority violation on file | VALDOSTA, Lowndes, GA | Pass | State |
| 2025-11-11 | ARGLASS YAMAMURA SE, LLC — high-priority violation on file | VALDOSTA, Lowndes, GA | Pass | State |
| 2025-11-11 | ARGLASS YAMAMURA SE, LLC — high-priority violation on file | VALDOSTA, Lowndes, GA | Pass | State |
| 2025-11-11 | ARGLASS YAMAMURA SE, LLC — high-priority violation on file | VALDOSTA, Lowndes, GA | Pass | State |
| 2025-11-11 | VALERO RENEWABLE FUELS LLC-CHARLES CITY | CHARLES CITY, Floyd, IA | Pass | State |
| 2025-11-11 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-11-11 | BAYER CROPSCIENCE LP 3670/6908/6909 | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-11-11 | ALLIED TUBE & CONDUIT CORP | HARVEY, Cook, IL | Pass | State |
| 2025-11-11 | HOFFER PLASTICS CORP | SOUTH ELGIN, Kane, IL | Pass | State |
| 2025-11-11 | HOFFER PLASTICS CORP | SOUTH ELGIN, Kane, IL | Pass | State |
| 2025-11-11 | HOFFER PLASTICS CORP | SOUTH ELGIN, Kane, IL | Pass | State |
| 2025-11-11 | HOFFER PLASTICS CORP | SOUTH ELGIN, Kane, IL | Pass | State |
| 2025-11-11 | HOFFER PLASTICS CORP | SOUTH ELGIN, Kane, IL | Pass | State |
| 2025-11-11 | HOFFER PLASTICS CORP | SOUTH ELGIN, Kane, IL | Pass | State |
| 2025-11-11 | HOFFER PLASTICS CORP | SOUTH ELGIN, Kane, IL | Pass | State |
| 2025-11-11 | HOFFER PLASTICS CORP | SOUTH ELGIN, Kane, IL | Pass | State |
| 2025-11-11 | HOFFER PLASTICS CORP | SOUTH ELGIN, Kane, IL | Pass | State |
| 2025-11-11 | ADKINS ENERGY LLC | LENA, Stephenson, IL | Pass | State |
| 2025-11-11 | LOUIS DREYFUS COMPANY AGRICULTURAL PRODUCTS LLC | CLAYPOOL, Kosciusko, IN | Pass | State |
| 2025-11-11 | LOUIS DREYFUS COMPANY AGRICULTURAL PRODUCTS LLC | CLAYPOOL, Kosciusko, IN | Pass | State |
| 2025-11-11 | LOUIS DREYFUS COMPANY AGRICULTURAL PRODUCTS LLC | CLAYPOOL, Kosciusko, IN | Pass | State |
| 2025-11-11 | LOUIS DREYFUS COMPANY AGRICULTURAL PRODUCTS LLC | CLAYPOOL, Kosciusko, IN | Pass | State |
| 2025-11-11 | CREEKSTONE FARMS PREMIUM BEEF (AIR) | ARKANSAS CITY, Cowley, KS | Pass | State |
| 2025-11-11 | BONANZA BIOENERGY (AIR) | GARDEN CITY, Finney, KS | Pass | State |
| 2025-11-11 | AHMLFG LLC | JEFFERSONVILLE, Montgomery, KY | Pass | State |
| 2025-11-11 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-11-11 | MPLX TERMINALS, LLC - ALGONQUIN TERMINAL | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-11-11 | WOODLAND PULP LLC — high-priority violation on file | BAILEYVILLE, TOWN OF, Washington, ME | Pass | State |
| 2025-11-11 | ERVIN AMASTEEL DIVISION | ADRIAN, Lenawee, MI | Pass | State |
| 2025-11-11 | AMERICAN CRYSTAL SUGAR - MOORHEAD — high-priority violation on file | MOORHEAD, Clay, MN | Pass | State |
| 2025-11-11 | ALLIANCE PIPELINE - ALBERT LEA 25-A | ALBERT LEA, Freeborn, MN | Pass | State |
| 2025-11-11 | XCEL ENERGY - BLUE LAKE | SHAKOPEE, Scott, MN | Pass | State |
| 2025-11-11 | ARCHER DANIELS MIDLAND CO/MID-AMERICA BIOFUELS LLC | MEXICO, Audrain, MO | Fail | State |
| 2025-11-11 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2025-11-11 | CHARLOTTE PIPE AND FOUNDRY COMPANY | OAKBORO, Stanly, NC | Pass | State |
| 2025-11-11 | HILAND PARTNERS HOLDINGS LLC - ALEX COMPRESSOR STATION | WATFORD CITY, McKenzie, ND | Pass | State |
| 2025-11-11 | BASIN ELECTRIC POWER COOPERATIVE - PIONEER GENERATION STATION - AQ | WILLISTON, Williams, ND | Pass | State |
| 2025-11-11 | OMAHA STEEL CASTINGS CO — high-priority violation on file | WAHOO, Saunders, NE | Pass | State |
| 2025-11-11 | DOGTOWN COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-11 | ENTERPRISE - OXY SAND DUNES NORTH COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.