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 |
|---|---|---|---|---|
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-10-07 | MOSAIC FERTILIZER, LLC | RIVERVIEW, Hillsborough, FL | Pass | State |
| 2025-10-07 | MOSAIC FERTILIZER, LLC | RIVERVIEW, Hillsborough, FL | Pass | State |
| 2025-10-07 | WESTROCK CP, LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2025-10-07 | WESTROCK CP, LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2025-10-07 | WESTROCK CP, LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2025-10-07 | WESTROCK CP, LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2025-10-07 | BALL METAL BEVERAGE CONTAINER CORP. | WINTER HAVEN, Polk, FL | Pass | State |
| 2025-10-07 | CARAUSTAR INDUSTRIES, INC. | AUSTELL, Cobb, GA | Pass | State |
| 2025-10-07 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-07 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-07 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-07 | FORT HALL MINE ROAD LANDFILL | POCATELLO, Bannock, ID | Pass | State |
| 2025-10-07 | NOURYON SURFACE CHEMISTRY LLC | MORRIS, Grundy, IL | Pass | State |
| 2025-10-07 | NOURYON SURFACE CHEMISTRY LLC | MORRIS, Grundy, IL | Pass | State |
| 2025-10-07 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-10-07 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-07 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-07 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-07 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-07 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-07 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-07 | EAST KENTUCKY POWER COOPERATIVE INC - CAGLES | ALBANY, Clinton, KY | Pass | State |
| 2025-10-07 | KIMBERLY-CLARK CORPORATION | OWENSBORO, Daviess, KY | Pass | State |
| 2025-10-07 | COMMONWEALTH ROLLED PRODUCTS INC | LEWISPORT, Hancock, KY | Pass | State |
| 2025-10-07 | HUBER ENGINEERED WOODS LLC | EASTON, Aroostook, ME | Pass | State |
| 2025-10-07 | SPRAGUE OPERATING RESOURCES LLC | SEARSPORT, Waldo, ME | Pass | State |
| 2025-10-07 | EUROVIA ATLANTIC COAST LLC D/B/A COPIAM ASPHALT SOLUTIONS | HERMON, Penobscot, ME | Pass | State |
| 2025-10-07 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2025-10-07 | UNIVERSITY OF MICHIGAN | ANN ARBOR, Washtenaw, MI | Pass | State |
| 2025-10-07 | AMERICAN CRYSTAL SUGAR - MOORHEAD — high-priority violation on file | MOORHEAD, Clay, MN | Pass | State |
| 2025-10-07 | CENTENNIAL GENERATING STATION | MOORHEAD, Clay, MN | Pass | State |
| 2025-10-07 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2025-10-07 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2025-10-07 | THOMAS HILL ENERGY CENTER - POWER DIVISION | CLIFTON HILL, Randolph, MO | Pass | State |
| 2025-10-07 | BATESVILLE MANUFACTURING LLC, VICKSBURG | VICKSBURG, Warren, MS | Pass | State |
| 2025-10-07 | BATESVILLE MANUFACTURING LLC, VICKSBURG | VICKSBURG, Warren, MS | Pass | State |
| 2025-10-07 | BATESVILLE MANUFACTURING LLC, VICKSBURG | VICKSBURG, Warren, MS | Pass | State |
| 2025-10-07 | BATESVILLE MANUFACTURING LLC, VICKSBURG | VICKSBURG, Warren, MS | Pass | State |
| 2025-10-07 | WORTHEN INDUSTRIES | NASHUA, Hillsborough, NH | Pass | State |
| 2025-10-07 | MIYAMURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-07 | MIYAMURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-07 | MOCKINGBIRD CENTRAL GATHERING FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-10-07 | MOCKINGBIRD CENTRAL GATHERING FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-10-07 | MOCKINGBIRD CENTRAL GATHERING FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-10-07 | MOCKINGBIRD CENTRAL GATHERING FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-10-07 | MOCKINGBIRD CENTRAL GATHERING FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-10-07 | HERRADURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-07 | HERRADURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-07 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-07 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-07 | WHEELABRATOR HUDSON FALLS | KINGSBURY, Washington, NY | Pass | State |
| 2025-10-07 | ST JOSEPH'S HOSPITAL HEALTH CENTER | SYRACUSE, Onondaga, NY | Pass | State |
| 2025-10-07 | CRAWFORD COMPRESSOR STATION | LANCASTER, Fairfield, OH | Pass | State |
| 2025-10-07 | CRAWFORD COMPRESSOR STATION | LANCASTER, Fairfield, OH | Pass | State |
| 2025-10-07 | CRAWFORD COMPRESSOR STATION | LANCASTER, Fairfield, OH | Pass | State |
| 2025-10-07 | CRAWFORD COMPRESSOR STATION | LANCASTER, Fairfield, OH | Pass | State |
| 2025-10-07 | TOM STACK LLC / COMMUNITY COMPRESSOR STATION | OMEGA, Blaine, OK | Pass | State |
| 2025-10-07 | ELLWOOD QUALITY STEELS CO/NEW CASTLE PLT | NEW CASTLE, Lawrence, PA | Pass | State |
| 2025-10-07 | PA STATE SYS OF HIGHER ED/SLIPPERY ROCK UNIV PA | SLIPPERY ROCK, Butler, PA | Pass | State |
| 2025-10-07 | DOMTAR PAPER CO/JOHNSONBURG MILL — high-priority violation on file | JOHNSONBURG, Elk, PA | Pass | State |
| 2025-10-07 | JESSOP STEEL LLC/WASHINGTON PLT | WASHINGTON, Washington, PA | Pass | State |
| 2025-10-07 | MARKWEST LIBERTY MIDSTREAM RES/DOWN HOME COMPRESSOR STATION | ROBINSON TWP, Washington, PA | Pass | State |
| 2025-10-07 | PL DEVELOPMENTS LLC — high-priority violation on file | PIEDMONT, Greenville, SC | Pass | State |
| 2025-10-07 | NORTHWESTERN ENERGY PUBLIC SERVICE CORPORATION - HURON | HURON, Beadle, SD | Pass | State |
| 2025-10-07 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pass | State |
| 2025-10-07 | NYDIG DFM LLC - DUCHESNE DATA POWER STATION (FORMERLY CRUSOE ENERGY SYSTEMS) | UPALCO, Duchesne, UT | Pass | State |
| 2025-10-07 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-10-07 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-10-07 | AMCOR PACKAGING, INC. - OSHKOSH NORTH | OSHKOSH, Wood, WI | Pass | State |
| 2025-10-07 | APPALACHIAN POWER CO. - MOUNTAINEER PLANT, NEW HAVEN | NEW HAVEN, Mason, WV | Pass | State |
| 2025-10-07 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Fail | State |
| 2025-10-06 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2025-10-06 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC | BUTLER, Choctaw, AL | Pass | State |
| 2025-10-06 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC | BUTLER, Choctaw, AL | Pass | State |
| 2025-10-06 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC | BUTLER, Choctaw, AL | Pass | State |
| 2025-10-06 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC | BUTLER, Choctaw, AL | Pass | State |
| 2025-10-06 | W&T OFFSHORE, INC. | MOBILE BAY, Mobile, AL | Pass | State |
| 2025-10-06 | W&T OFFSHORE, INC. | MOBILE BAY, Mobile, AL | Pass | State |
| 2025-10-06 | W&T OFFSHORE, INC. | MOBILE BAY, Mobile, AL | Pass | State |
| 2025-10-06 | W&T OFFSHORE, INC. | MOBILE BAY, Mobile, AL | Pass | State |
| 2025-10-06 | DESOTO GATHERING COMPANY, LLC - STEELHEAD CPF-2 | CLINTON, Van Buren, AR | Pass | State |
| 2025-10-06 | DESOTO GATHERING COMPANY, LLC - NORTH YELLOWSTONE CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2025-10-06 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Fail | State |
| 2025-10-06 | DANIEL COMPANY LLC | ADELANTO, San Bernardino, CA | Pass | Local |
| 2025-10-06 | CAMPOS BROTHERS | CARUTHERS, Fresno, CA | Pass | Local |
| 2025-10-06 | CAMPOS BROTHERS | CARUTHERS, Fresno, CA | Pass | Local |
| 2025-10-06 | EXTRACTION - WAKE EAST 32N PROD FACILITY | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-06 | EXTRACTION - WAKE EAST 32N PROD FACILITY | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-06 | THIELE KAOLIN COMPANY, REEDY CREEK | WRENS, Glascock, GA | Pass | State |
| 2025-10-06 | THIELE KAOLIN COMPANY, REEDY CREEK | WRENS, Glascock, GA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.