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 |
|---|---|---|---|---|
| 2025-11-20 | TULARE CITY WASTE WATER PLANT — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-11-20 | TULARE CITY WASTE WATER PLANT — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-11-20 | TULARE CITY WASTE WATER PLANT — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-11-20 | TULARE CITY WASTE WATER PLANT — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-11-20 | WILLIAMS FIELD - WILLOW CREEK GAS PLANT — high-priority violation on file | RIO BLANCO 18 MILES W OF, Rio Blanco, CO | Pass | State |
| 2025-11-20 | CITY OF JACKSONVILLE | BALDWIN, Duval, FL | Pass | State |
| 2025-11-20 | ARMSTRONG WORLD INDUSTRIES, INC. | PENSACOLA, Escambia, FL | Pass | State |
| 2025-11-20 | ARMSTRONG WORLD INDUSTRIES, INC. | PENSACOLA, Escambia, FL | Pass | State |
| 2025-11-20 | FLORIDA POWER & LIGHT COMPANY | PACE, Santa Rosa, FL | Pass | State |
| 2025-11-20 | GEORGIA-PACIFIC GYPSUM LLC - SAVANNAH PLANT | SAVANNAH, Chatham, GA | Pass | State |
| 2025-11-20 | GA POWER CO. PLANT YATES | NEWNAN, Coweta, GA | Pass | State |
| 2025-11-20 | SUNIVA, INC. | NORCROSS, Gwinnett, GA | Pass | State |
| 2025-11-20 | SUNIVA, INC. | NORCROSS, Gwinnett, GA | Pass | State |
| 2025-11-20 | SUNIVA, INC. | NORCROSS, Gwinnett, GA | Pass | State |
| 2025-11-20 | SUNIVA, INC. | NORCROSS, Gwinnett, GA | Pass | State |
| 2025-11-20 | CARGILL INC-EDDYVILLE | EDDYVILLE, Monroe, IA | Pass | State |
| 2025-11-20 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2025-11-20 | ITAFOS CONDA LLC - TV FACILITY | SODA SPRINGS, Caribou, ID | Pass | State |
| 2025-11-20 | KINCAID GENERATION LLC | KINCAID, Christian, IL | Pass | State |
| 2025-11-20 | SUPERIOR ALUMINUM ALLOYS LLC — high-priority violation on file | NEW HAVEN, Allen, IN | Pass | State |
| 2025-11-20 | SUPERIOR ALUMINUM ALLOYS LLC — high-priority violation on file | NEW HAVEN, Allen, IN | Pass | State |
| 2025-11-20 | SUPERIOR ALUMINUM ALLOYS LLC — high-priority violation on file | NEW HAVEN, Allen, IN | Pass | State |
| 2025-11-20 | SUPERIOR ALUMINUM ALLOYS LLC — high-priority violation on file | NEW HAVEN, Allen, IN | Pass | State |
| 2025-11-20 | GREDE LLC — high-priority violation on file | NEW CASTLE, Henry, IN | Pass | State |
| 2025-11-20 | CENTURION CONTAINER LLC | GARY, Lake, IN | Pass | State |
| 2025-11-20 | BCI SOLUTIONS INCORPORATED | BREMEN, Marshall, IN | Pass | State |
| 2025-11-20 | GARTLAND FOUNDRY CO INC — high-priority violation on file | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-11-20 | GARTLAND FOUNDRY CO INC — high-priority violation on file | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-11-20 | GARTLAND FOUNDRY CO INC — high-priority violation on file | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-11-20 | GARTLAND FOUNDRY CO INC — high-priority violation on file | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-11-20 | GARTLAND FOUNDRY CO INC — high-priority violation on file | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-11-20 | GARTLAND FOUNDRY CO INC — high-priority violation on file | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-11-20 | GARTLAND FOUNDRY CO INC — high-priority violation on file | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-11-20 | GARTLAND FOUNDRY CO INC — high-priority violation on file | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-11-20 | BAVARIAN TRUCKING COMPANY INC | WALTON, Boone, KY | Pass | State |
| 2025-11-20 | FORD MOTOR COMPANY KENTUCKY TRUCK PLANT | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-11-20 | GLOBAL COMPANIES LLC | SOUTH PORTLAND, Cumberland, ME | Pass | State |
| 2025-11-20 | GRAYLING GENERATING STATION LTD PARTNER | GRAYLING, Crawford, MI | Pass | State |
| 2025-11-20 | CABOT CORPORATION | MIDLAND, Midland, MI | Pass | State |
| 2025-11-20 | NORTHERN NATURAL GAS - ALBERT LEA | HARTLAND, Freeborn, MN | Pass | State |
| 2025-11-20 | ALTER TRADING CORPORATION - SARDIS | SARDIS, Panola, MS | Pass | State |
| 2025-11-20 | ALTER TRADING CORPORATION - SARDIS | SARDIS, Panola, MS | Pass | State |
| 2025-11-20 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pass | State |
| 2025-11-20 | HILAND PARTNERS HOLDINGS LLC - NORSE GAS PLANT | MCGREGOR, Divide, ND | Pass | State |
| 2025-11-20 | WATTS REGULATOR CO. | FRANKLIN, Merrimack, NH | Pass | State |
| 2025-11-20 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-11-20 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-11-20 | DUTCHESS CO RESOURCE RECOVERY FACILITY | POUGHKEEPSIE, Dutchess, NY | Pass | State |
| 2025-11-20 | ASCENT RESOURCES - UTICA LLC - OMAITS SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-11-20 | ASCENT RESOURCES - UTICA LLC - OMAITS SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-11-20 | ASCENT RESOURCES - UTICA LLC - OMAITS SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-11-20 | GULFPORT APPALACHIA, LLC - KINYO PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-11-20 | GULFPORT APPALACHIA, LLC - KINYO PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-11-20 | GULFPORT APPALACHIA, LLC - KINYO PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-11-20 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-11-20 | ET GATHERING PROCESSING LLC / GRADY COMPRESSOR STATION | CHICKASHA, Grady, OK | Pass | State |
| 2025-11-20 | MSA SAFETY PITTSBURGH MFG LLC/MURRYSVILLE PLT | MURRYSVILLE, Westmoreland, PA | Pass | State |
| 2025-11-20 | WALTER R EARLE ASPHALT PLT/MORRISVILLE — high-priority violation on file | MORRISVILLE, Bucks, PA | Pending | State |
| 2025-11-20 | CENTURY ALUMINUM OF SOUTH CAROLINA INC — high-priority violation on file | GOOSE CREEK, Berkeley, SC | Fail | State |
| 2025-11-20 | BMW MANUFACTURING CO LLC | GREER, Greenville, SC | Pass | State |
| 2025-11-20 | MIDWEST YOGURT, INC. | MURFREESBORO, Rutherford, TN | Pass | State |
| 2025-11-20 | INTERMOUNTAIN POWER SERVICE CORPORATION | DELTA, Millard, UT | Pass | State |
| 2025-11-20 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-11-20 | TREX COMPANY, INC. - VIRGINIA DECKING AND RAILING | WINCHESTER, Frederick, VA | Pass | State |
| 2025-11-20 | DOMINION ENERGY - VIRGINIA CITY HYBRID ENERGY CENTER | ST PAUL, Wise, VA | Pass | State |
| 2025-11-20 | ERGON - WEST VIRGINIA, INC., NEWELL | NEWELL, Hancock, WV | Pass | State |
| 2025-11-20 | DTM APPALACHIA GATHERING, LLC, DAYBROOK STATION | FAIRVIEW, Marion, WV | Pass | State |
| 2025-11-20 | MONONGAHELA POWER COMPANY, FORT MARTIN STATION | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2025-11-20 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | SOUTHERN NATURAL GAS | ANNISTON, Calhoun, AL | Pass | State |
| 2025-11-19 | SOUTHERN NATURAL GAS | ANNISTON, Calhoun, AL | Pass | State |
| 2025-11-19 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-11-19 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-11-19 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-11-19 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-1 | QUITMAN, Faulkner, AR | Pass | State |
| 2025-11-19 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-2 | QUITMAN, Faulkner, AR | Pass | State |
| 2025-11-19 | LANXESS CORPORATION-SOUTH PLANT | EL DORADO, Union, AR | Incomplete | State |
| 2025-11-19 | LANXESS CORPORATION-SOUTH PLANT | EL DORADO, Union, AR | Pass | State |
| 2025-11-19 | USMC - YERMO LOGISTICS CNTR | BARSTOW, San Bernardino, CA | Pass | Local |
| 2025-11-19 | LA COUNTY SANITATION DISTRICTS (SPADRA) | POMONA, Los Angeles, CA | Pass | Local |
| 2025-11-19 | VERNON PUBLIC UTILITIES | LOS ANGELES, Los Angeles, CA | Pass | Local |
| 2025-11-19 | WILLIAMS FIELD - WILLOW CREEK GAS PLANT — high-priority violation on file | RIO BLANCO 18 MILES W OF, Rio Blanco, CO | Pass | State |
| 2025-11-19 | WILLIAMS FIELD - WILLOW CREEK GAS PLANT — high-priority violation on file | RIO BLANCO 18 MILES W OF, Rio Blanco, CO | Pass | State |
| 2025-11-19 | OWENS-BROCKWAY GLASS - WINDSOR #28 — high-priority violation on file | WINDSOR, Weld, CO | Fail | State |
| 2025-11-19 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-19 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-19 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-19 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-11-19 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-11-19 | CITY OF JACKSONVILLE | BALDWIN, Duval, FL | Pass | State |
| 2025-11-19 | GOLD BOND BUILDING PRODUCTS, LLC | GIBSONTON, Hillsborough, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | 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.