EPA Air · stack tests by year

Air-emissions stack tests in 2026

11,110Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit.

States, 2026

Other years

Air-emissions stack tests recorded in 2026

Date	Facility	Where	Kind	Agency
2026-01-13	FLINT HILLS RESOURCES PINE BEND REFINERY	ROSEMOUNT, Dakota, MN	Pass	State
2026-01-13	SANIMAX USA INC	SOUTH SAINT PAUL, Dakota, MN	Pass	State
2026-01-13	AUDUBON MATERIALS, LLC - SUGAR CREEK PLANT	SUGAR CREEK, Jackson, MO	Pass	State
2026-01-13	AUDUBON MATERIALS, LLC - SUGAR CREEK PLANT	SUGAR CREEK, Jackson, MO	Pass	State
2026-01-13	AUDUBON MATERIALS, LLC - SUGAR CREEK PLANT	SUGAR CREEK, Jackson, MO	Pass	State
2026-01-13	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-13	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-13	MIDCONTINENT EXPRESS PIPELINE LLC, MEP 4 VICKSBURG COMPRESSOR STATION	EDWARDS, Hinds, MS	Pass	State
2026-01-13	MIDCONTINENT EXPRESS PIPELINE LLC, MEP 4 VICKSBURG COMPRESSOR STATION	EDWARDS, Hinds, MS	Pass	State
2026-01-13	MIDCONTINENT EXPRESS PIPELINE LLC, MEP 4 VICKSBURG COMPRESSOR STATION	EDWARDS, Hinds, MS	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	HARRISVILLE, Simpson, MS	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	HARRISVILLE, Simpson, MS	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	HARRISVILLE, Simpson, MS	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	HARRISVILLE, Simpson, MS	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	HARRISVILLE, Simpson, MS	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	HARRISVILLE, Simpson, MS	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	HARRISVILLE, Simpson, MS	Pass	State
2026-01-13	GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION	HARRISVILLE, Simpson, MS	Pass	State
2026-01-13	LEAF RIVER ENERGY CENTER LLC, LEAF RIVER ENERGY CENTER	TAYLORSVILLE, Smith, MS	Pass	State
2026-01-13	LEAF RIVER ENERGY CENTER LLC, LEAF RIVER ENERGY CENTER	TAYLORSVILLE, Smith, MS	Pass	State
2026-01-13	LEAF RIVER ENERGY CENTER LLC, LEAF RIVER ENERGY CENTER	TAYLORSVILLE, Smith, MS	Pass	State
2026-01-13	LEAF RIVER ENERGY CENTER LLC, LEAF RIVER ENERGY CENTER	TAYLORSVILLE, Smith, MS	Pass	State
2026-01-13	COLSTRIP ENERGY LTD PARTNERSHIP	COLSTRIP, Rosebud, MT	Pass	State
2026-01-13	COLSTRIP ENERGY LTD PARTNERSHIP	COLSTRIP, Rosebud, MT	Pass	State
2026-01-13	COLSTRIP ENERGY LTD PARTNERSHIP	COLSTRIP, Rosebud, MT	Pass	State
2026-01-13	CITY OF ROCKY MOUNT PUBLIC UTILITIES, ELECTRIC SUBSTATION 9	ROCKY MOUNT, Nash, NC	Pending	State
2026-01-13	COC SURRY LFG, LLC	MOUNT AIRY, Surry, NC	Pending	State
2026-01-13	CLARIOS	KERNERSVILLE, Forsyth, NC	Pass	Local
2026-01-13	ENTERPRISE - CEDAR CANYON COMPRESSOR STATION	MALAGA, Eddy, NM	Pass	State
2026-01-13	ENTERPRISE - CEDAR CANYON COMPRESSOR STATION	MALAGA, Eddy, NM	Pass	State
2026-01-13	ENTERPRISE - CEDAR CANYON COMPRESSOR STATION	MALAGA, Eddy, NM	Pass	State
2026-01-13	TEXANA COMPRESSOR STATION	CARLSBAD, Eddy, NM	Pass	State
2026-01-13	TANGO COMPRESSOR STATION	LA HUERTA, Eddy, NM	Pass	State
2026-01-13	HORNED FROG COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-13	HORNED FROG COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-13	ACHILLES COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-13	ACHILLES COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-13	CAESARS ENTERTAINMENT INCORPORATED - CAESARS CONSOLIDATED PROPERTIES	LAS VEGAS, Clark, NV	Pass	Local
2026-01-13	OSWEGO HARBOR POWER	OSWEGO, Oswego, NY	Pass	State
2026-01-13	PCS NITROGEN OHIO, L.P. — high-priority violation on file	LIMA, Allen, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	MICHIGAN METAL COATINGS	SIDNEY, Shelby, OH	Pass	State
2026-01-13	PYLES PAD 952757	BEALLSVILLE, Monroe, OH	Pass	State
2026-01-13	PYLES PAD 952757	BEALLSVILLE, Monroe, OH	Pass	State
2026-01-13	PYLES PAD 952757	BEALLSVILLE, Monroe, OH	Pass	State
2026-01-13	DIETRICH PAD 952432	CLARINGTON, Monroe, OH	Pass	State
2026-01-13	DIETRICH PAD 952432	CLARINGTON, Monroe, OH	Pass	State
2026-01-13	DIETRICH PAD 952432	CLARINGTON, Monroe, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	COLLEGEVILLE HOLDINGS LLC/COLLEGEVILLE	COLLEGEVILLE, Montgomery, PA	Pass	State
2026-01-13	PA DPW/WARREN STATE HOSP	NORTH WARREN, Warren, PA	Pass	State
2026-01-13	APPALACHIA MIDSTREAM SVC LLC/RATTLESNAKE HILL COMP STA	AUBURN TOWNSHIP, Susquehanna, PA	Pass	State
2026-01-13	NFG MIDSTREAM COVINGTON LLC/BREON COMP STA	MANSFIELD, Tioga, PA	Pass	State
2026-01-13	REGENCY MARCELLUS GAS GATHERING LLC/MEHOOPANY STA	TUNKHANNOCK, Wyoming, PA	Pass	State
2026-01-13	SWN PRODUCTION CO LLC/KING NORTH 3H	NEW MILFORD, Susquehanna, PA	Pass	State
2026-01-13	MARINE CORPS RECRUIT DEPOT (MCRD) PARRIS ISLAND	PARRIS ISLAND, Beaufort, SC	Pending	State
2026-01-13	SANTEE COOPER WINYAH GENERATING STATION	GEORGETOWN, Georgetown, SC	Pass	State
2026-01-13	UCC SEADRIFT OPERATIONS	SEADRIFT, Calhoun, TX	N/A	State
2026-01-13	NORTH WORD GAS PLANT	HALLETTSVILLE, Lavaca, TX	Pass	State
2026-01-13	NORTH WORD GAS PLANT	HALLETTSVILLE, Lavaca, TX	Pass	State
2026-01-13	UNIVERSITY OF UTAH	SALT LAKE CITY, Salt Lake, UT	Pass	State
2026-01-13	ANR PIPELINE CO - KEWASKUM COMPRESSOR ST	ADELL, Taylor, WI	Pass	State
2026-01-13	VIRGINIA ELECTRIC AND POWER COMPANY, MT. STORM	MT. STORM, Grant, WV	Pass	State
2026-01-12	DESOTO GATHERING COMPANY, LLC - CHARLEY CPF-4	HEBER SPRINGS, Cleburne, AR	Pass	State
2026-01-12	DESOTO GATHERING COMPANY, LLC - CHARLEY CPF-4	HEBER SPRINGS, Cleburne, AR	Pass	State
2026-01-12	MINERAL PARK MINE	GOLDEN VALLEY, Mohave, AZ	Pass	State
2026-01-12	DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION	OWENSVILLE, Gibson, IN	Pass	State
2026-01-12	ENERSYS DELAWARE INC	RICHMOND, Madison, KY	Pass	State
2026-01-12	BASF AGRICULTURAL SOLUTIONS US LLC	PALMYRA, Marion, MO	Pass	State
2026-01-12	3 BEAR LIBBY GAS PLANT	MONUMENT, Lea, NM	Pass	State
2026-01-12	3 BEAR LIBBY GAS PLANT	MONUMENT, Lea, NM	Pass	State
2026-01-12	ACHILLES COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-12	ACHILLES COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-12	HELIOS COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-12	CAESARS ENTERTAINMENT INCORPORATED - CAESARS CONSOLIDATED PROPERTIES	LAS VEGAS, Clark, NV	Pass	Local
2026-01-12	CAESARS ENTERTAINMENT INCORPORATED - CAESARS CONSOLIDATED PROPERTIES	LAS VEGAS, Clark, NV	Pass	Local
2026-01-12	CURIA NEW YORK INC	RENSSELAER, Rensselaer, NY	Pass	State
2026-01-12	EOG RESOURCES, INC - SPARKMAN GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC - SPARKMAN GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC - SPARKMAN GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC. - WAGNER GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC. - WAGNER GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC. - WAGNER GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	NFG MIDSTREAM CLERMONT LLC/CLERMONT WEST COMP STA	EMPORIUM, Elk, PA	Pass	State
2026-01-12	INFINITY NATURAL RESOURCES SOUTH BEND COMP STA	SOUTH BEND TWP, Armstrong, PA	Pass	State
2026-01-12	CAROLINA GAS TRANSMISSION LLC - EDGEMOOR COMPRESSOR STATION	EDGEMOOR, Chester, SC	Pass	State
2026-01-12	VALERO CORPUS CHRISTI REFINERY EAST PLANT	CORPUS CHRISTI, Nueces, TX	Pass	State
2026-01-12	VALERO CORPUS CHRISTI REFINERY EAST PLANT	CORPUS CHRISTI, Nueces, TX	Pass	State
2026-01-12	VALERO CORPUS CHRISTI REFINERY EAST PLANT	CORPUS CHRISTI, Nueces, TX	Pass	State
2026-01-12	VALERO CORPUS CHRISTI REFINERY EAST PLANT	CORPUS CHRISTI, Nueces, TX	Pass	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.