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
2026-01-20	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-20	TEXAS GAS TRANS LLC	HARDINSBURG, Breckinridge, KY	Pass	State
2026-01-20	REWORLD HAVERHILL LLC F.K.A. COVANTA HAVERHILL INCORPORATED	HAVERHILL, TOWN OF, Essex, MA	Pending	State
2026-01-20	BAKER COMMODITIES	TEWKSBURY, Middlesex, MA	Pending	State
2026-01-20	NORTHLAND ALUMINUM PRODUCTS	SAINT LOUIS PARK, Hennepin, MN	N/A	State
2026-01-20	CHS OILSEED PROCESSING	FAIRMONT, Martin, MN	Pass	State
2026-01-20	ANDERSEN CORPORATION	BAYPORT, Washington, MN	Pass	State
2026-01-20	CLARIOS	KERNERSVILLE, Forsyth, NC	Pending	Local
2026-01-20	CLARIOS	KERNERSVILLE, Forsyth, NC	Pass	Local
2026-01-20	AG PROCESSING INC — high-priority violation on file	DAVID CITY, Butler, NE	Fail	State
2026-01-20	POKER LAKE NO1 COMPRESSOR STATION	LOVING, Eddy, NM	Pass	State
2026-01-20	GOLDEN SPUR 36 WF1	MALAGA, Eddy, NM	Pass	State
2026-01-20	WHITE CITY ROAD COMPRESSOR STATION	LOVING, Eddy, NM	Pass	State
2026-01-20	TIGER BOOSTER STATION	CARLSBAD, Eddy, NM	Pass	State
2026-01-20	ZIA II GAS PLANT	LOCO HILLS, Lea, NM	Pass	State
2026-01-20	EOG - JAFAR COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-20	EOG - JAFAR COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-20	AO6 BATTERY	MONUMENT, Lea, NM	Pass	State
2026-01-20	VANDELAY COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-20	ANDERSON FED COM PAD B BATTERY	MONUMENT, Lea, NM	Pass	State
2026-01-20	SUPREME COMPRESSOR STATION	MALAGA, Lea, NM	Pass	State
2026-01-20	FAIRBORN CEMENT COMPANY LLC	XENIA, Greene, OH	Pass	State
2026-01-20	MONTOUR LLC/MONTOUR SES	WASHINGTONVILLE, Montour, PA	Pass	State
2026-01-20	WILLIAMS FIELD SVC CO LLC/CHURCH COMP STA	SPRINGVILLE, Susquehanna, PA	Pass	State
2026-01-20	NATL FUEL GAS SUPPLY CORP/MERCER COMP STA	MERCER, Mercer, PA	Pass	State
2026-01-20	REPSOL OIL & GAS USA LLC/DCNR 010 COMP STA	MORRIS RUN, Tioga, PA	Pass	State
2026-01-20	EXPAND OPERATING LLC/NR-23 FOUR BUCKS PAD	SUSQUEHANNA, Susquehanna, PA	Pass	State
2026-01-20	DOMTAR PAPER COMPANY LLC	BENNETTSVILLE, Marlboro, SC	Pass	State
2026-01-20	COLOSSUS DATA CENTER	MEMPHIS, Shelby, TN	Pass	Local
2026-01-20	COLOSSUS DATA CENTER	MEMPHIS, Shelby, TN	Pass	Local
2026-01-20	PORT ARTHUR REFINERY — high-priority violation on file	PORT ARTHUR, Jefferson, TX	Pass	State
2026-01-20	WESTROCK LONGVIEW LLC — high-priority violation on file	LONGVIEW, Cowlitz, WA	Pass	State
2026-01-20	ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER	PARDEEVILLE, Columbia, WI	Pass	State
2026-01-20	BIG RIVER RESOURCES BOYCEVILLE LLC	BOYCEVILLE, Dunn, WI	Pass	State
2026-01-20	KOHLER CO - METALS PROCESSING COMPLEX	KOHLER, Taylor, WI	Pass	State
2026-01-20	ANR PIPELINE CO - WEYAUWEGA COMPRESSOR STATION	WEYAUWEGA, Waushara, WI	Pass	State
2026-01-19	DESOTO GATHERING COMPANY, LLC - NORTHWEST CHARLEY CPF-2	GREERS FERRY, Cleburne, AR	Pass	State
2026-01-19	DESOTO GATHERING COMPANY, LLC - TIGER CPF-1	BRADFORD, White, AR	Pass	State
2026-01-19	SAN JOAQUIN REFINING CO — high-priority violation on file	BAKERSFIELD, Kern, CA	Pass	Local
2026-01-19	SAN JOAQUIN REFINING CO — high-priority violation on file	BAKERSFIELD, Kern, CA	Pass	Local
2026-01-19	SAN JOAQUIN REFINING CO — high-priority violation on file	BAKERSFIELD, Kern, CA	Pass	Local
2026-01-19	PAR - REFINERY — high-priority violation on file	KAPOLEI, Honolulu, HI	Pass	State
2026-01-19	CLEARWATER PAPER CORP-PPD	LEWISTON, Nez Perce, ID	Pass	State
2026-01-19	WHITE CITY ROAD COMPRESSOR STATION	LOVING, Eddy, NM	Pass	State
2026-01-19	WHITE CITY ROAD COMPRESSOR STATION	LOVING, Eddy, NM	Pass	State
2026-01-19	TIGER BOOSTER STATION	CARLSBAD, Eddy, NM	Pass	State
2026-01-19	LOST TANK 25 CPF AND CGL	MALAGA, Eddy, NM	Pass	State
2026-01-19	ZIA II GAS PLANT	LOCO HILLS, Lea, NM	Pass	State
2026-01-19	ZIA II GAS PLANT	LOCO HILLS, Lea, NM	Pass	State
2026-01-19	REVOLUTION COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-19	VENOM COMPRESSOR STATION	JAL, Lea, NM	Pass	State
2026-01-19	MARKWEST - CADIZ GAS PLANT	CADIZ, Harrison, OH	Pass	State
2026-01-19	MARKWEST - CADIZ GAS PLANT	CADIZ, Harrison, OH	Pass	State
2026-01-19	MARKWEST - CADIZ GAS PLANT	CADIZ, Harrison, OH	Pass	State
2026-01-19	MARKWEST - CADIZ GAS PLANT	CADIZ, Harrison, OH	Pass	State
2026-01-19	MARKWEST - CADIZ GAS PLANT	CADIZ, Harrison, OH	Pass	State
2026-01-19	MARKWEST - CADIZ GAS PLANT	CADIZ, Harrison, OH	Pass	State
2026-01-19	EQM GATHERING OPCO LLC/HOPEWELL RIDGE INTERCONNECT STA	SYCAMORE, Greene, PA	Pass	State
2026-01-19	LIPPINCOTT, F. PAD 1 — high-priority violation on file	KINGSLEY, Susquehanna, PA	Pending	State
2026-01-19	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-01-19	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-01-18	INTERNATIONAL PAPER COMPANY - ROME MILL	ROME, Floyd, GA	Pass	State
2026-01-16	GOLDEN VALLEY ELECTRIC ASSOCIATION / HEALY POWER PLANT — high-priority violation on file	HEALY, Denali, AK	Pass	State
2026-01-16	U.S. GSA CENTRAL HEATING PLANT — high-priority violation on file	WASHINGTON, District of Columbia, DC	Incomplete	State
2026-01-16	AMCOR TOBACCO PACKAGING AMERICAS, INC.	PEACHTREE CITY, Fayette, GA	Pass	State
2026-01-16	PAR - REFINERY — high-priority violation on file	KAPOLEI, Honolulu, HI	Pass	State
2026-01-16	IDAHO FALLS POWER	IDAHO FALLS, Bonneville, ID	Pass	State
2026-01-16	LOUIS DREYFUS COMPANY AGRICULTURAL PRODUCTS LLC	CLAYPOOL, Kosciusko, IN	Pass	State
2026-01-16	LOUIS DREYFUS COMPANY AGRICULTURAL PRODUCTS LLC	CLAYPOOL, Kosciusko, IN	Pass	State
2026-01-16	LOUIS DREYFUS COMPANY AGRICULTURAL PRODUCTS LLC	CLAYPOOL, Kosciusko, IN	Pass	State
2026-01-16	LOUIS DREYFUS COMPANY AGRICULTURAL PRODUCTS LLC	CLAYPOOL, Kosciusko, IN	Pass	State
2026-01-16	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Fail	State
2026-01-16	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-16	SIGECO - FB CULLEY GENERATING STATION	NEWBURGH, Warrick, IN	Pass	State
2026-01-16	GREDE IRON MOUNTAIN, LLC — high-priority violation on file	KINGSFORD, Dickinson, MI	Pass	State
2026-01-16	ADAC AUTOMOTIVE MUSKEGON PLANTS	MUSKEGON, Muskegon, MI	Pass	State
2026-01-16	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-16	NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER	STENNIS SPAC, Hancock, MS	Pass	State
2026-01-16	CLARIOS	KERNERSVILLE, Forsyth, NC	Pass	Local
2026-01-16	WEST TURKEY TRACK BOOSTER — high-priority violation on file	LOCO HILLS, Eddy, NM	Pass	State
2026-01-16	CAT ISLAND 16 CTB 3	MALAGA, Eddy, NM	Pass	State
2026-01-16	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-16	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-16	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-16	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-16	SNYDER BROS INC/MUSHROOM MINE COMP STA	WORTHINGTON, Armstrong, PA	Pass	State
2026-01-16	RHODE ISLAND HOSPITAL	PROVIDENCE, Providence, RI	Pass	State
2026-01-15	MURPHY OIL USA INC	ANNISTON, Calhoun, AL	Pass	State
2026-01-15	AM/NS CALVERT LLC	CALVERT, Mobile, AL	Pass	State
2026-01-15	ALMATIS, INC.	BENTON, Saline, AR	Pass	State
2026-01-15	DESOTO GATHERING COMPANY, LLC - NORTH YELLOWSTONE CPF-1	BEE BRANCH, Van Buren, AR	Pass	State
2026-01-15	DESOTO GATHERING COMPANY, LLC - NORTH YELLOWSTONE CPF-1	BEE BRANCH, Van Buren, AR	Pass	State
2026-01-15	AERA ENERGY LLC	SAN ARDO, Monterey, CA	Pass	Local
2026-01-15	AERA ENERGY LLC	SAN ARDO, Monterey, CA	Pass	Local
2026-01-15	CRESTWOOD WEST COAST LLC	BAKERSFIELD, Kern, CA	Pass	Local
2026-01-15	CRESTWOOD WEST COAST LLC	BAKERSFIELD, Kern, CA	Pass	Local
2026-01-15	CRESTWOOD WEST COAST LLC	BAKERSFIELD, Kern, CA	Pass	Local
2026-01-15	CRESTWOOD WEST COAST LLC	BAKERSFIELD, Kern, CA	Pass	Local
2026-01-15	SAPUTO CHEESE USA INC	TULARE, Tulare, CA	Pass	Local
2026-01-15	SAPUTO CHEESE USA INC	TULARE, Tulare, CA	Pass	Local

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