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
2026-01-15	SAPUTO CHEESE USA INC	TULARE, Tulare, CA	Pass	Local
2026-01-15	SAPUTO CHEESE USA INC	TULARE, Tulare, CA	Pass	Local
2026-01-15	HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file	HARTFORD, Hartford, CT	Pass	State
2026-01-15	MONTVILLE POWER LLC	CONNECTICUT, Undetermined, CT	Pass	State
2026-01-15	MONTVILLE POWER LLC	CONNECTICUT, Undetermined, CT	Pass	State
2026-01-15	DC WATER (BLUE PLAINS WASTEWATER TREATMENT FACILITY) — high-priority violation on file	WASHINGTON, District of Columbia, DC	Pass	State
2026-01-15	DC WATER (BLUE PLAINS WASTEWATER TREATMENT FACILITY) — high-priority violation on file	WASHINGTON, District of Columbia, DC	Pass	State
2026-01-15	AMCOR TOBACCO PACKAGING AMERICAS, INC.	PEACHTREE CITY, Fayette, GA	Pass	State
2026-01-15	PAR - REFINERY — high-priority violation on file	KAPOLEI, Honolulu, HI	Pass	State
2026-01-15	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-15	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-15	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-15	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-15	FCA US LLC - DETROIT ASSEMBLY COMPLEX — high-priority violation on file	DETROIT, Wayne, MI	Pass	State
2026-01-15	OAKLAND UNIVERSITY	ROCHESTER, Oakland, MI	Pass	State
2026-01-15	AMEREN MISSOURI- PENO CREEK ENERGY CENTER	BOWLING GREEN, Pike, MO	Pass	State
2026-01-15	AMEREN MISSOURI- PENO CREEK ENERGY CENTER	BOWLING GREEN, Pike, MO	Pass	State
2026-01-15	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-15	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-15	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-15	LEAF RIVER ENERGY CENTER LLC, LEAF RIVER ENERGY CENTER	TAYLORSVILLE, Smith, MS	Pass	State
2026-01-15	LEAF RIVER ENERGY CENTER LLC, LEAF RIVER ENERGY CENTER	TAYLORSVILLE, Smith, MS	Pass	State
2026-01-15	LEAF RIVER ENERGY CENTER LLC, LEAF RIVER ENERGY CENTER	TAYLORSVILLE, Smith, MS	Pass	State
2026-01-15	LEAF RIVER ENERGY CENTER LLC, LEAF RIVER ENERGY CENTER	TAYLORSVILLE, Smith, MS	Pass	State
2026-01-15	GRIFOLS THERAPEUTICS LLC	CLAYTON, Johnston, NC	Pass	State
2026-01-15	BIOGEN	RESEARCH TRIANGLE PARK, Wake, NC	Pass	State
2026-01-15	FIDELITY REAL ESTATE CO.- FIDELITY MORRISVILLE DATA CENTER	RESEARCH TRIANGLE PARK, Wake, NC	Pass	State
2026-01-15	TARGA BADLANDS, LLC - LITTLE MISSOURI GAS PLANT (LMGP) AND SMOKEY COMPRESSOR STA	WATFORD CITY, McKenzie, ND	N/A	State
2026-01-15	NORTHERN NATURAL GAS COMPANY	BEATRICE, Gage, NE	Pass	State
2026-01-15	CAT ISLAND 16 CTB 3	MALAGA, Eddy, NM	Pass	State
2026-01-15	CAT ISLAND 16 CTB 3	MALAGA, Eddy, NM	Pass	State
2026-01-15	TRISTE DRAW 25 WEST BATTERY	MALAGA, Lea, NM	Pass	State
2026-01-15	HONDA DEVELOPMENT & MANUFACTURING OF AMERICA, LLC - ADC	RAYMOND, Union, OH	Pass	State
2026-01-15	HONDA DEVELOPMENT & MANUFACTURING OF AMERICA, LLC - ADC	RAYMOND, Union, OH	Pass	State
2026-01-15	HONDA DEVELOPMENT & MANUFACTURING OF AMERICA, LLC - ADC	RAYMOND, Union, OH	Pass	State
2026-01-15	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-15	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS	MANSFIELD, Richland, OH	Pass	State
2026-01-15	HAMILTON PATRIOT LLC/HAMILTON PATRIOT GENERATION PLANT — high-priority violation on file	MONTGOMERY, Lycoming, PA	Pass	State
2026-01-15	EXCO APPALACHIA MIDSTREAM LLC/POVERTY HILL COMP STA	KITTANNING, Armstrong, PA	Pass	State
2026-01-15	MICHELIN NORTH AMERICA INC SANDY SPRINGS FACILITY (US2)	SANDY SPRINGS, Anderson, SC	Pending	State
2026-01-15	UNIVERSITY OF UTAH	SALT LAKE CITY, Salt Lake, UT	Pending	State
2026-01-15	UNIVERSITY OF UTAH	SALT LAKE CITY, Salt Lake, UT	Pass	State
2026-01-15	UNIVERSITY OF UTAH	SALT LAKE CITY, Salt Lake, UT	Pass	State
2026-01-15	NOVEC ENERGY PRODUCTION HALIFAX COUNTY BIOMASS	SOUTH BOSTON, Halifax, VA	Pass	State
2026-01-15	CITY OF VANCOUVER / WESTSIDE WASTEWATER TREATMENT PLANT — high-priority violation on file	VANCOUVER, Clark, WA	Pass	Local
2026-01-15	COLUMBIA GAS TRANSMISSION, LLC, LOST RIVER	MATHIAS, Hardy, WV	Pass	State
2026-01-14	HENRY BRICK COMPANY, INC.	SELMA, Dallas, AL	Pass	State
2026-01-14	VERTEX REFINING ALABAMA LLC	SARALAND, Mobile, AL	Pass	State
2026-01-14	GENPAK LLC	MONTGOMERY, Montgomery, AL	Pass	State
2026-01-14	ALABAMA POWER COMPANY (MILLER POWER PLANT)	QUINTON, Jefferson, AL	Pass	Local
2026-01-14	DESOTO GATHERING COMPANY, LLC - PHILLIPS MOUNTAIN CPF-2	CLEVELAND, Conway, AR	Pass	State
2026-01-14	ENTERGY ARKANSAS, LLC - WHITE BLUFF PLANT	REDFIELD, Jefferson, AR	Pass	State
2026-01-14	DESOTO GATHERING COMPANY, LLC - GRAVEL HILL CPF-4	SCOTLAND, Van Buren, AR	Pass	State
2026-01-14	ROGERS CORPORATION - ROOSEVELT AVE FACILITY — high-priority violation on file	MARICOPA COUNTY, Maricopa, AZ	Pass	Local
2026-01-14	SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file	BAKERSFIELD, Kern, CA	Pass	Local
2026-01-14	SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file	BAKERSFIELD, Kern, CA	Pass	Local
2026-01-14	TULARE LAKE COMPOST	KETTLEMAN CITY, Kings, CA	Pass	Local
2026-01-14	TULARE LAKE COMPOST	KETTLEMAN CITY, Kings, CA	Pass	Local
2026-01-14	TULARE LAKE COMPOST	KETTLEMAN CITY, Kings, CA	Pass	Local
2026-01-14	TULARE LAKE COMPOST	KETTLEMAN CITY, Kings, CA	Pass	Local
2026-01-14	TULARE LAKE COMPOST	KETTLEMAN CITY, Kings, CA	Pass	Local
2026-01-14	TULARE LAKE COMPOST	KETTLEMAN CITY, Kings, CA	Pass	Local
2026-01-14	U.S. GSA CENTRAL HEATING PLANT — high-priority violation on file	WASHINGTON, District of Columbia, DC	Incomplete	State
2026-01-14	LOCKHEED MARTIN AERONAUTICS CO.	MARIETTA, Cobb, GA	Pass	State
2026-01-14	AMCOR TOBACCO PACKAGING AMERICAS, INC.	PEACHTREE CITY, Fayette, GA	Pass	State
2026-01-14	PAR - REFINERY — high-priority violation on file	KAPOLEI, Honolulu, HI	Fail	State
2026-01-14	VERBIO — high-priority violation on file	NEVADA, Story, IA	Pass	State
2026-01-14	POET BIOREFINING - CLOVERDALE LLC — high-priority violation on file	CLOVERDALE, Putnam, IN	Pass	State
2026-01-14	POET BIOREFINING - CLOVERDALE LLC — high-priority violation on file	CLOVERDALE, Putnam, IN	Pass	State
2026-01-14	POET BIOREFINING - CLOVERDALE LLC — high-priority violation on file	CLOVERDALE, Putnam, IN	Pass	State
2026-01-14	POET BIOREFINING - CLOVERDALE LLC — high-priority violation on file	CLOVERDALE, Putnam, IN	Pass	State
2026-01-14	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-14	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-14	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-14	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-14	ADM GRAIN RIVER SYSTEM INC - DESTREHAN FACILITY	DESTREHAN, St. Charles, LA	Pass	State
2026-01-14	TOKAI CARBON CB LTD - ADDIS FACILITY — high-priority violation on file	ADDIS, West Baton Rouge, LA	Pass	State
2026-01-14	SOLUTIA INCORPORATED — high-priority violation on file	SPRINGFIELD, CITY OF, Hampden, MA	Pending	State
2026-01-14	WHEELABRATOR MILLBURY INC	MILLBURY, Worcester, MA	Pending	State
2026-01-14	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-14	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-14	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-14	MIDCONTINENT EXPRESS PIPELINE LLC, MEP 4 VICKSBURG COMPRESSOR STATION	EDWARDS, Hinds, MS	Pass	State
2026-01-14	MIDCONTINENT EXPRESS PIPELINE LLC, MEP 4 VICKSBURG COMPRESSOR STATION	EDWARDS, Hinds, MS	Pass	State
2026-01-14	MIDCONTINENT EXPRESS PIPELINE LLC, MEP 4 VICKSBURG COMPRESSOR STATION	EDWARDS, Hinds, MS	Pass	State
2026-01-14	MIDCONTINENT EXPRESS PIPELINE LLC, MEP 4 VICKSBURG COMPRESSOR STATION	EDWARDS, Hinds, MS	Pass	State
2026-01-14	MIDCONTINENT EXPRESS PIPELINE LLC, MEP 4 VICKSBURG COMPRESSOR STATION	EDWARDS, Hinds, MS	Pass	State
2026-01-14	MIDCONTINENT EXPRESS PIPELINE LLC, MEP 4 VICKSBURG COMPRESSOR STATION	EDWARDS, Hinds, MS	Pass	State

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