EPA Air · stack tests by year

Air-emissions stack tests in 2025

26,633Stack tests

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

States, 2025

Other years

Air-emissions stack tests recorded in 2025

Date	Facility	Where	Kind	Agency
2025-12-05	DTE ELECTRIC COMPANY - MONROE POWER PLANT	MONROE, Monroe, MI	Pass	State
2025-12-05	J. H. CAMPBELL PLANT	WEST OLIVE, Ottawa, MI	Pass	State
2025-12-05	CADILLAC RENEWABLE ENERGY FACILITY	CADILLAC, Wexford, MI	Pass	State
2025-12-05	XCEL ENERGY - ALLEN S KING GENERATING PLANT	BAYPORT, Washington, MN	Pass	State
2025-12-05	ALUMINUM DYNAMICS, LLC	COLUMBUS, Lowndes, MS	Pass	State
2025-12-05	ALUMINUM DYNAMICS, LLC	COLUMBUS, Lowndes, MS	Pass	State
2025-12-05	ALUMINUM DYNAMICS, LLC	COLUMBUS, Lowndes, MS	Pass	State
2025-12-05	ALUMINUM DYNAMICS, LLC	COLUMBUS, Lowndes, MS	Pass	State
2025-12-05	ALUMINUM DYNAMICS, LLC	COLUMBUS, Lowndes, MS	Pass	State
2025-12-05	ALUMINUM DYNAMICS, LLC	COLUMBUS, Lowndes, MS	Pass	State
2025-12-05	ALUMINUM DYNAMICS, LLC	COLUMBUS, Lowndes, MS	Pass	State
2025-12-05	ALUMINUM DYNAMICS, LLC	COLUMBUS, Lowndes, MS	Pass	State
2025-12-05	CAMINO BOOSTER STATION	LOVING, Eddy, NM	Pass	State
2025-12-05	CAMINO BOOSTER STATION	LOVING, Eddy, NM	Pending	State
2025-12-05	CAMINO BOOSTER STATION	LOVING, Eddy, NM	Pass	State
2025-12-05	EOG - POSEIDON LOCAL GAS LIFT	MALAGA, Lea, NM	Pass	State
2025-12-05	EOG - POSEIDON LOCAL GAS LIFT	MALAGA, Lea, NM	Pass	State
2025-12-05	SOUTHSIDE WATER RECLAMATION FACILITY	ALBUQUERQUE, Bernalillo, NM	Pass	Local
2025-12-05	TAIT ELECTRIC GENERATING STATION	MORAINE, Montgomery, OH	Pass	State
2025-12-05	TAIT ELECTRIC GENERATING STATION	MORAINE, Montgomery, OH	Pass	State
2025-12-05	CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file	MIDDLETOWN, Butler, OH	Pass	State
2025-12-05	GEORGIA-PACIFIC TOLEDO LLC — high-priority violation on file	TOLEDO, Lincoln, OR	N/A	State
2025-12-05	POINT COMFORT PEAKING FACILITY	POINT COMFORT, Calhoun, TX	Pass	State
2025-12-05	POINT COMFORT PEAKING FACILITY	POINT COMFORT, Calhoun, TX	Pass	State
2025-12-05	KENNECOTT MAIN STACK, SMELTER AND	BINGHAM CANYON, Salt Lake, UT	Pass	State
2025-12-05	WALMART SUPERCENTER #5753	ALEXANDRIA, Fairfax, VA	Fail	State
2025-12-05	WI DOA / UW-RIVER FALLS POWER PLT	RIVER FALLS, Polk, WI	Pass	State
2025-12-05	WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM	PROCTOR, Marshall, WV	Pass	State
2025-12-05	MONONGAHELA POWER COMPANY, FORT MARTIN STATION	MAIDSVILLE, Monongalia, WV	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-05	MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION)	CHEYENNE, Laramie, WY	Pass	State
2025-12-04	DESOTO GATHERING COMPANY LLC - CHARLEY CPF-3	HEBER SPRINGS, Cleburne, AR	Pass	State
2025-12-04	ALBEMARLE CORPORATION - WEST PLANT	MAGNOLIA, Columbia, AR	Pass	State
2025-12-04	MERIT ENERGY COMPANY, LLC - TOBEY COMPRESSOR STATION	CHARLESTON, Franklin, AR	Pass	State
2025-12-04	DESOTO GATHERING COMPANY LLC - YELLOWSTONE CPF-2	QUITMAN, Van Buren, AR	Pass	State
2025-12-04	INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file	MARICOPA COUNTY, Maricopa, AZ	Pass	Local
2025-12-04	MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC)	MOSS LANDING, Monterey, CA	Pass	Local
2025-12-04	LUNDAY-THAGARD CO DBA WORLD OIL REFINING — high-priority violation on file	SOUTH GATE, Los Angeles, CA	Pass	Local
2025-12-04	SO CAL GAS CO/PLAYA DEL REY STORAGE	PLAYA DEL REY, Los Angeles, CA	Pass	Local
2025-12-04	BALL WESTERN CAN COMPANY	OAKDALE, Stanislaus, CA	Pass	Local
2025-12-04	BALL WESTERN CAN COMPANY	OAKDALE, Stanislaus, CA	Pass	Local
2025-12-04	BALL WESTERN CAN COMPANY	OAKDALE, Stanislaus, CA	Pass	Local
2025-12-04	ROHM & HAAS ELECTRONIC MATERIALS,CMP,INC	NEWARK, New Castle, DE	Pass	State
2025-12-04	ROHM & HAAS ELECTRONIC MATERIALS,CMP,INC	NEWARK, New Castle, DE	Pass	State
2025-12-04	ROHM & HAAS ELECTRONIC MATERIALS,CMP,INC	NEWARK, New Castle, DE	Pass	State
2025-12-04	ROHM & HAAS ELECTRONIC MATERIALS,CMP,INC	NEWARK, New Castle, DE	Pass	State
2025-12-04	ROHM & HAAS ELECTRONIC MATERIALS,CMP,INC	NEWARK, New Castle, DE	Pass	State
2025-12-04	CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL	NEWARK, New Castle, DE	Pass	State
2025-12-04	CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL	NEWARK, New Castle, DE	Pass	State
2025-12-04	CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL	NEWARK, New Castle, DE	Pass	State
2025-12-04	CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL	NEWARK, New Castle, DE	Pass	State
2025-12-04	CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL	NEWARK, New Castle, DE	Pass	State
2025-12-04	CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL	NEWARK, New Castle, DE	Pass	State
2025-12-04	CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL	NEWARK, New Castle, DE	Pass	State

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

What this page shows

This page covers Clean Air Act facilities in the EPA air register and stack tests in 2025. It lists 26,291 stack tests recorded nationwide in 2025.