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
2026-01-27	ZIA II GAS PLANT	LOCO HILLS, Lea, NM	Pass	State
2026-01-27	ROBERNE TB	MALAGA, Lea, NM	Pass	State
2026-01-27	REGENCY MARCELLUS GATHERING LLC/BRADFORD WEST COMP STA	GRANVILLE SUMMIT, Bradford, PA	Pass	State
2026-01-27	REGENCY MARCELLUS GAS GATHERING LLC/LONE WALNUT COMP STA	JERSEY SHORE, Lycoming, PA	Pass	State
2026-01-27	COTERRA ENERGY INC/BURKE G PAD 1	MESHOPPEN, Susquehanna, PA	Pass	State
2026-01-27	DOBROSIELSKI, S PAD 1	MESHOPPEN, Susquehanna, PA	Pass	State
2026-01-27	REDFIELD ENERGY LLC — high-priority violation on file	REDFIELD, Beadle, SD	Pass	State
2026-01-27	COLOSSUS DATA CENTER	MEMPHIS, Shelby, TN	Pass	Local
2026-01-27	MICROSOFT CORPORATION - MKE 3B DATA CENTER	MOUNT PLEASANT, Richland, WI	N/A	State
2026-01-27	DISCOVERY ENERGY LLC	MOSEL, Taylor, WI	Pass	State
2026-01-26	VALERO WILMINGTON ASPHALT PLANT	WILMINGTON, Los Angeles, CA	Pass	Local
2026-01-26	FLORIDA POWER & LIGHT (PTF)	HOMESTEAD, Miami-Dade, FL	Pass	State
2026-01-26	RAYONIER PERFORMANCE FIBERS, LLC	JESUP, Wayne, GA	Pass	State
2026-01-26	METAL TECHNOLOGIES AUBURN LLC — high-priority violation on file	AUBURN, DeKalb, IN	Pass	State
2026-01-26	AMERICAN CRYSTAL SUGAR - EAST GRAND FORKS	EAST GRAND FORKS, Polk, MN	Pass	State
2026-01-26	ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES)	CAMPBELL COUNTY, Campbell, WY	Pass	State
2026-01-26	ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES)	CAMPBELL COUNTY, Campbell, WY	Pass	State
2026-01-26	ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES)	CAMPBELL COUNTY, Campbell, WY	Pass	State
2026-01-26	ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES)	CAMPBELL COUNTY, Campbell, WY	Pass	State
2026-01-26	ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES)	CAMPBELL COUNTY, Campbell, WY	Pass	State
2026-01-26	ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES)	CAMPBELL COUNTY, Campbell, WY	Pass	State
2026-01-26	ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES)	CAMPBELL COUNTY, Campbell, WY	Pass	State
2026-01-26	ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES)	CAMPBELL COUNTY, Campbell, WY	Pass	State
2026-01-25	GREEN PLAINS CENTRAL CITY LLC — high-priority violation on file	CENTRAL CITY, Merrick, NE	Pass	State
2026-01-24	ENERSYS, INC. — high-priority violation on file	WARRENSBURG, Johnson, MO	Pass	State
2026-01-24	ENERSYS, INC. — high-priority violation on file	WARRENSBURG, Johnson, MO	Pass	State
2026-01-23	TDX POWER, LLC / TNSG NORTH POWER PLANT — high-priority violation on file	NORTH SLOPE BOROUGH, North Slope, AK	Pass	State
2026-01-23	OLYMPUS TERMINALS LLC	CARSON, Los Angeles, CA	Pass	Local
2026-01-23	CS WIND AMERICA, INC — high-priority violation on file	PUEBLO, Pueblo, CO	Fail	State
2026-01-23	PAR - REFINERY — high-priority violation on file	KAPOLEI, Honolulu, HI	Pass	State
2026-01-23	WHITEWATER MILL LLC — high-priority violation on file	WEST HARRISON, Dearborn, IN	Pass	State
2026-01-23	WHITEWATER MILL LLC — high-priority violation on file	WEST HARRISON, Dearborn, IN	Pass	State
2026-01-23	WHITEWATER MILL LLC — high-priority violation on file	WEST HARRISON, Dearborn, IN	Pass	State
2026-01-23	WHITEWATER MILL LLC — high-priority violation on file	WEST HARRISON, Dearborn, IN	Pass	State
2026-01-23	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Fail	State
2026-01-23	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Pass	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Pass	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Pass	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Fail	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Pass	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Pass	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Pass	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Fail	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Pass	State
2026-01-23	CLARIOS, LLC	SAINT JOSEPH, Buchanan, MO	Fail	State
2026-01-23	KRAKEN CENTRAL SITE	SIDNEY, Richland, MT	Pass	State
2026-01-23	KRAKEN CENTRAL SITE	SIDNEY, Richland, MT	Pass	State
2026-01-23	KRAKEN CENTRAL SITE	SIDNEY, Richland, MT	Pass	State
2026-01-23	KRAKEN CENTRAL SITE	SIDNEY, Richland, MT	Pass	State
2026-01-23	CLARIOS	KERNERSVILLE, Forsyth, NC	Pass	Local
2026-01-23	CLARIOS	KERNERSVILLE, Forsyth, NC	Pass	Local
2026-01-23	HF SINCLAIR NAVAJO REFINING LLC (ARTESIA) — high-priority violation on file	ARTESIA, Eddy, NM	N/A	State
2026-01-23	DEEP FLAT BOOSTER STATION	AVALON, Eddy, NM	Pass	State
2026-01-23	BAIRD BROTHERS SAWMILL INC — high-priority violation on file	CANFIELD, Mahoning, OH	Pass	State
2026-01-23	BAIRD BROTHERS SAWMILL INC — high-priority violation on file	CANFIELD, Mahoning, OH	Pass	State
2026-01-23	BAIRD BROTHERS SAWMILL INC — high-priority violation on file	CANFIELD, Mahoning, OH	Pass	State
2026-01-23	EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD	BUFFALO, Guernsey, OH	Pass	State
2026-01-23	EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD	BUFFALO, Guernsey, OH	Pass	State
2026-01-23	EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD	BUFFALO, Guernsey, OH	Pass	State
2026-01-23	EOG RESOURCES, INC. - BEARS NB BUF PAD	SARAHSVILLE, Noble, OH	Pass	State
2026-01-23	EOG RESOURCES, INC. - BEARS NB BUF PAD	SARAHSVILLE, Noble, OH	Pass	State
2026-01-23	GEORGIA-PACIFIC TOLEDO LLC — high-priority violation on file	TOLEDO, Lincoln, OR	Pass	State
2026-01-23	CLEAN EARTH OF SOUTHEAST PA/MORRISVILLE — high-priority violation on file	MORRISVILLE, Bucks, PA	Pending	State
2026-01-23	REPSOL OIL & GAS USA LLC/PUTNAM COMP STA	TROY, Bradford, PA	Pass	State
2026-01-23	ABBOTT, M. PAD 1	NEW MILFORD, Susquehanna, PA	Pass	State
2026-01-23	RESONAC GRAPHITE AMERICA INC — high-priority violation on file	RIDGEVILLE, Dorchester, SC	Pass	State
2026-01-23	COLOSSUS DATA CENTER	MEMPHIS, Shelby, TN	Pass	Local
2026-01-23	DOMINION/ODEC - CLOVER POWER STATION — high-priority violation on file	CLOVER, Halifax, VA	Pass	State
2026-01-22	HARVEST ALASKA LNG, LLC / LIQUEFIED NATURAL GAS (LNG) FACILITY PR	NORTH SLOPE BOROUGH, North Slope, AK	Pass	State
2026-01-22	AM/NS CALVERT LLC	CALVERT, Mobile, AL	Pass	State
2026-01-22	AM/NS CALVERT LLC	CALVERT, Mobile, AL	Pass	State
2026-01-22	CMC STEEL FABRICATORS	MARICOPA COUNTY, Maricopa, AZ	Pass	Local
2026-01-22	AIR LIQUID LARGE INDUSTRIES US, LP	EL SEGUNDO, Los Angeles, CA	Pass	Local
2026-01-22	BRIDGE ENERGY, LLC	BREA, Orange, CA	Pass	Local
2026-01-22	PDC ENERGY - KODAK NORTH PAD 2&3	WINDSOR AREA, Weld, CO	Pass	State
2026-01-22	HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file	HARTFORD, Hartford, CT	Fail	State
2026-01-22	YALE UNIVERSITY / CENTRAL POWER PLANT	NEW HAVEN, New Haven, CT	Pass	State
2026-01-22	YALE UNIVERSITY / CENTRAL POWER PLANT	NEW HAVEN, New Haven, CT	Pass	State
2026-01-22	YALE UNIVERSITY / CENTRAL POWER PLANT	NEW HAVEN, New Haven, CT	Pass	State
2026-01-22	POLMIX AMERICAS INC.	JACKSONVILLE, Duval, FL	Pass	State
2026-01-22	THE SCRUGGS COMPANY - SURRENCY PLANT — high-priority violation on file	SURRENCY, Appling, GA	Pass	State
2026-01-22	GA POWER CO. - PLANT SCHERER	JULIETTE, Monroe, GA	Pass	State
2026-01-22	WASHINGTON COUNTY ENERGY FACILITY	SANDERSVILLE, Washington, GA	Pass	State
2026-01-22	WASHINGTON COUNTY ENERGY FACILITY	SANDERSVILLE, Washington, GA	Pass	State
2026-01-22	WASHINGTON COUNTY ENERGY FACILITY	SANDERSVILLE, Washington, GA	Pass	State
2026-01-22	WASHINGTON COUNTY ENERGY FACILITY	SANDERSVILLE, Washington, GA	Pass	State
2026-01-22	WASHINGTON COUNTY ENERGY FACILITY	SANDERSVILLE, Washington, GA	Pass	State
2026-01-22	PAR - REFINERY — high-priority violation on file	KAPOLEI, Honolulu, HI	Pass	State
2026-01-22	MURPHY-BROWN LLC	ALGONA, Kossuth, IA	Pass	State
2026-01-22	MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA	DES MOINES, Polk, IA	Pass	Local
2026-01-22	MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA	DES MOINES, Polk, IA	Pass	Local
2026-01-22	WHITEWATER MILL LLC — high-priority violation on file	WEST HARRISON, Dearborn, IN	Pass	State
2026-01-22	WHITEWATER MILL LLC — high-priority violation on file	WEST HARRISON, Dearborn, IN	Pass	State
2026-01-22	WHITEWATER MILL LLC — high-priority violation on file	WEST HARRISON, Dearborn, IN	Pass	State
2026-01-22	WHITEWATER MILL LLC — high-priority violation on file	WEST HARRISON, Dearborn, IN	Pass	State
2026-01-22	ZIMMER BIOMET INC. — high-priority violation on file	WARSAW, Kosciusko, IN	Pass	State
2026-01-22	ZIMMER BIOMET INC. — high-priority violation on file	WARSAW, Kosciusko, IN	Pass	State
2026-01-22	ZIMMER BIOMET INC. — high-priority violation on file	WARSAW, Kosciusko, IN	Pass	State
2026-01-22	ZIMMER BIOMET INC. — high-priority violation on file	WARSAW, Kosciusko, IN	Pass	State

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