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 |
|---|---|---|---|---|
| 2025-11-20 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | 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 |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | FLORIDA POWER & LIGHT COMPANY | PACE, Santa Rosa, FL | Pass | State |
| 2025-11-19 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2025-11-19 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2025-11-19 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2025-11-19 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2025-11-19 | HELCO - KEAHOLE — high-priority violation on file | KAILUA KONA, Hawaii, HI | Pass | State |
| 2025-11-19 | CARGILL INC-EDDYVILLE | EDDYVILLE, Monroe, IA | Pass | State |
| 2025-11-19 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2025-11-19 | NORTHWEST PIPELINE LLC SODA SPRINGS | GEORGETOWN, Bear Lake, ID | Fail | State |
| 2025-11-19 | BLUE MOUND COMPRESSOR STATION | BLUE MOUND, Christian, IL | Pass | State |
| 2025-11-19 | SOUTHERN ILLINOIS POWER COOP | MARION, Williamson, IL | Pass | State |
| 2025-11-19 | METAL SOURCE LLC — high-priority violation on file | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-11-19 | METAL SOURCE LLC — high-priority violation on file | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-11-19 | METAL SOURCE LLC — high-priority violation on file | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-11-19 | SCEPTER INCORPORATED | BICKNELL, Knox, IN | Pass | State |
| 2025-11-19 | SCEPTER INCORPORATED | BICKNELL, Knox, IN | Pass | State |
| 2025-11-19 | CONSTELLATION POWER - PERRYMAN POWER PLANT | ABERDEEN, Harford, MD | Pass | State |
| 2025-11-19 | ND PAPER INC. | RUMFORD, Oxford, ME | Pass | State |
| 2025-11-19 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2025-11-19 | NORTH AMERICAN NATURAL RESOURCES -VENICE PARK 9526 GENERATING STATION | LENNON, Shiawassee, MI | Pass | State |
| 2025-11-19 | CAMBRIA CO | LE SUEUR, Le Sueur, MN | Pass | State |
| 2025-11-19 | GRANITE FALLS ENERGY LLC | GRANITE FALLS, Yellow Medicine, MN | Pass | State |
| 2025-11-19 | AMERESCO JEFFERSON CITY LLC | JEFFERSON CITY, Cole, MO | Pass | State |
| 2025-11-19 | AMERESCO JEFFERSON CITY LLC | JEFFERSON CITY, Cole, MO | Pass | State |
| 2025-11-19 | METROPOLITAN ST. LOUIS SEWER DISTRICT BISSELL POINT WWTP | SAINT LOUIS, St. Louis (city), MO | Pending | State |
| 2025-11-19 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Fail | State |
| 2025-11-19 | PLEASANT HILL COMPRESSOR STATION | PLEASANT HILL, Northampton, NC | Pending | State |
| 2025-11-19 | PATHEON MANUFACTURING SERVICES LLC, PART OF THERMO FISHER SC | GREENVILLE, Pitt, NC | Pending | State |
| 2025-11-19 | E ENERGY ADAMS LLC — high-priority violation on file | ADAMS, Gage, NE | Pass | State |
| 2025-11-19 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-11-19 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-11-19 | QUEEN KEELY CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-11-19 | QUEEN KEELY CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-11-19 | PELHAM COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-11-19 | CROWN CORK AND SEAL MESQUITE — high-priority violation on file | MESQUITE, Clark, NV | Pass | Local |
| 2025-11-19 | JOSH PACKAGING INC | HAUPPAUGE, Suffolk, NY | Pass | State |
| 2025-11-19 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2025-11-19 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2025-11-19 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2025-11-19 | BLUE RACER MIDSTREAM LLC - BELMONT CO FIELD STATION #1 | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | BLUE RACER MIDSTREAM LLC - BELMONT CO FIELD STATION #1 | BARNESVILLE, Belmont, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.