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 |
|---|---|---|---|---|
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | CHEVRON USA PRODUCTS INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-11-18 | SONOCO PROTECTIVE SOLUTIONS | PUTNAM, Windham, CT | Pass | State |
| 2025-11-18 | CAPITOL POWER PLANT | WASHINGTON, District of Columbia, DC | Pending | State |
| 2025-11-18 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-11-18 | TAMPA ELECTRIC COMPANY (TEC) | GIBSONTON, Hillsborough, FL | Pass | State |
| 2025-11-18 | HILLSBOROUGH COUNTY SOLID WASTE MGT DEPT | LITHIA, Hillsborough, FL | Pass | State |
| 2025-11-18 | GOLD BOND BUILDING PRODUCTS, LLC | GIBSONTON, Hillsborough, FL | Pass | State |
| 2025-11-18 | LIGNOTECH FLORIDA LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2025-11-18 | LIGNOTECH FLORIDA LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2025-11-18 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-18 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-18 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-18 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-18 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-18 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-18 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-18 | FLORIDA POWER & LIGHT COMPANY | PACE, Santa Rosa, FL | Pass | State |
| 2025-11-18 | INTERFOR U.S. INC. - EATONTON SAWMILL | EATONTON, Putnam, GA | Pass | State |
| 2025-11-18 | INTERFOR U.S. INC. - EATONTON SAWMILL | EATONTON, Putnam, GA | Pass | State |
| 2025-11-18 | INTERFOR U.S. INC. - EATONTON SAWMILL | EATONTON, Putnam, GA | Pass | State |
| 2025-11-18 | INTERFOR U.S. INC. - EATONTON SAWMILL | EATONTON, Putnam, GA | Pass | State |
| 2025-11-18 | OCCIDENTAL CHEMICAL CORPORATION - AUGUSTA SILICATE PLANT | AUGUSTA, Richmond, GA | Pass | State |
| 2025-11-18 | OCCIDENTAL CHEMICAL CORPORATION - AUGUSTA SILICATE PLANT | AUGUSTA, Richmond, GA | Pass | State |
| 2025-11-18 | CARGILL INC-EDDYVILLE | EDDYVILLE, Monroe, IA | Pass | State |
| 2025-11-18 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-11-18 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2025-11-18 | BLUE MOUND COMPRESSOR STATION | BLUE MOUND, Christian, IL | Pass | State |
| 2025-11-18 | BLUE MOUND COMPRESSOR STATION | BLUE MOUND, Christian, IL | Pass | State |
| 2025-11-18 | MISSISSIPPI LIME CO | PRAIRIE DU ROCHER, Randolph, IL | Pass | State |
| 2025-11-18 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2025-11-18 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2025-11-18 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2025-11-18 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2025-11-18 | CLEVELAND-CLIFFS BURNS HARBOR LLC — high-priority violation on file | BURNS HARBOR, Porter, IN | Pass | State |
| 2025-11-18 | INTAT PRECISION INCORPORATED — high-priority violation on file | RUSHVILLE, Rush, IN | Pass | State |
| 2025-11-18 | INTAT PRECISION INCORPORATED — high-priority violation on file | RUSHVILLE, Rush, IN | Pass | State |
| 2025-11-18 | NUCOR STEEL BRANDENBURG | BRANDENBURG, Meade, KY | Pass | State |
| 2025-11-18 | AMERICAN FUJI SEAL INC | BARDSTOWN, Nelson, KY | Pass | State |
| 2025-11-18 | FORD MOTOR COMPANY KENTUCKY TRUCK PLANT | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-11-18 | RECAST ENERGY LOUISVILLE, LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-11-18 | MILLERSVILLE LANDFILL GAS TO ELECTRICITY FACILITY | SEVERN, Anne Arundel, MD | Pass | State |
| 2025-11-18 | ST MARYS CEMENT U.S. LLC, CHARLEVOIX PLANT | CHARLEVOIX, Charlevoix, MI | Pass | State |
| 2025-11-18 | UPPER MICHIGAN ENERGY RESOURCES -F.D. KUESTER G.S. | NEGAUNEE, Marquette, MI | Pass | State |
| 2025-11-18 | CEMSTONE NONMETALLIC | MENDOTA HEIGHTS, Dakota, MN | Pass | State |
| 2025-11-18 | CAMBRIA CO | LE SUEUR, Le Sueur, MN | Pass | State |
| 2025-11-18 | NORTHERN NATURAL GAS CO - FARIBAULT | FARIBAULT, Rice, MN | Pass | State |
| 2025-11-18 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2025-11-18 | CAROLINA STALITE COMPANY | NORWOOD, Stanly, NC | Pass | State |
| 2025-11-18 | GREEN PLAINS CENTRAL CITY LLC — high-priority violation on file | CENTRAL CITY, Merrick, NE | Pass | State |
| 2025-11-18 | DARK STAR COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-18 | DARK STAR COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-18 | DARK STAR COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-18 | CASSIUS PAD W | LOVING, Eddy, NM | Pass | State |
| 2025-11-18 | EOG - ODIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-18 | PNM RIO BRAVO GENERATING STATION — high-priority violation on file | ALBUQUERQUE, Bernalillo, NM | Pass | Local |
| 2025-11-18 | WHEELABRATOR WESTCHESTER, L.P. | PEEKSKILL, Westchester, NY | Pass | State |
| 2025-11-18 | GUTCHESS LUMBER COMPANY INC. | CORTLAND, Cortland, NY | Pass | State |
| 2025-11-18 | HILCORP ENERGY - POLAND-CLL PRODUCTION FACILITY | POLAND, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2025-11-18 | HILCORP ENERGY - POLAND-CLL PRODUCTION FACILITY | POLAND, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2025-11-18 | HILCORP ENERGY - POLAND-CLL PRODUCTION FACILITY | POLAND, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - WHEELING VALLEY WHL BL | MAYNARD, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - WHEELING VALLEY WHL BL | MAYNARD, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - WHEELING VALLEY WHL BL | MAYNARD, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | ASCENT RESOURCES - UTICA LLC - PANG WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-11-18 | BLUE RACER MIDSTREAM LLC - NOBLE CO FIELD STATION #1 | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-11-18 | BLUE RACER MIDSTREAM LLC - NOBLE CO FIELD STATION #1 | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-11-18 | BLUE RACER MIDSTREAM LLC - NOBLE CO FIELD STATION #1 | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-11-18 | TAIT ELECTRIC GENERATING STATION | MORAINE, Montgomery, OH | Pass | State |
| 2025-11-18 | EXPAND OPERATING LLC/MCENANEY BRA PAD | NEW ALBANY, Bradford, PA | Pass | State |
| 2025-11-18 | HILCORP ENERGY CO/NORTH BEAVER KEPHART PROD FAC | ENON VALLEY, Lawrence, PA | Pass | State |
| 2025-11-18 | KRIEBEL MINERALS INC/ARMBURST SONY COMPRESSOR | MT PLEASANT, Westmoreland, PA | Pass | State |
| 2025-11-18 | EXPAND OPERATING LLC/DEER PARK PAD COMP STA | MEHOOPANY, Wyoming, PA | Pass | State |
| 2025-11-18 | COPE STATION | COPE, Orangeburg, SC | Pass | State |
| 2025-11-18 | SEDIVER GENERATING FACILITY | YORK, York, SC | Pass | State |
| 2025-11-18 | NUGEN ENERGY LLC — high-priority violation on file | MARION, Turner, SD | Pass | State |
| 2025-11-18 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-11-18 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-18 | GRAYMONT WESTERN LIME INC — high-priority violation on file | GREEN BAY, Brown, WI | Pass | State |
| 2025-11-18 | AMCOR PACKAGING INC, - LANCASTER — high-priority violation on file | LANCASTER, Grant, WI | Pass | State |
| 2025-11-18 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2025-11-17 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-11-17 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-11-17 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-11-17 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.