EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-09-19 | GULFPORT APPALACHIA, LLC - ROUTH | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-19 | GULFPORT APPALACHIA, LLC - ROUTH | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-19 | GULFPORT APPALACHIA, LLC - ROUTH | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-19 | SCHUYLKILL ENERGY RES/ST NICHOLAS COGEN — high-priority violation on file | SHENANDOAH, Schuylkill, PA | Pass | State |
| 2025-09-19 | DIVERSIFIED MIDSTREAM LLC/TIOGA COMP STA | WELLSBORO, Tioga, PA | Pass | State |
| 2025-09-19 | EASTERN GAS TRANSMISSION AND STORAGE, INC., SCHUTTE STATION | SEDALIA, Doddridge, WV | Pass | State |
| 2025-09-19 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-19 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-19 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-18 | NUCOR YAMATO STEEL COMPANY | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2025-09-18 | ABIDE FARMS, LLC | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2025-09-18 | EQUILON ENTER. LLC, SHELL OIL PROD. US | CARSON, Los Angeles, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-18 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-09-18 | ASCEND PERFORMANCE MATERIALS OPERATIONS — high-priority violation on file | CANTONMENT, Escambia, FL | Pass | State |
| 2025-09-18 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2025-09-18 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-18 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-18 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-18 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-18 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-18 | SOWEGA POWER 100, LLC - SOWEGA POWER 100 FACILITY | BACONTON, Mitchell, GA | Pass | State |
| 2025-09-18 | ASAMA COLDWATER MANUFACTURING GEORGIA | WARRENTON, Warren, GA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | KENT NUTRITION GROUP - SHELDON | SHELDON, Sioux, IA | Pass | State |
| 2025-09-18 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-09-18 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-09-18 | KY UTILITIES CO - GHENT STATION | GHENT, Carroll, KY | Pass | State |
| 2025-09-18 | KY UTILITIES CO - BROWN STATION | HARRODSBURG, Mercer, KY | Pass | State |
| 2025-09-18 | CONVERSE CENTRAL FACILITY | MANSFIELD, De Soto, LA | Pass | State |
| 2025-09-18 | FPL ENERGY WYMAN LLC | YARMOUTH, Cumberland, ME | Pass | State |
| 2025-09-18 | SPRAGUE OPERATING RESOURCES LLC | SOUTH PORTLAND, Cumberland, ME | Pass | State |
| 2025-09-18 | VENTRA EVART, LLC | EVART, Osceola, MI | Pass | State |
| 2025-09-18 | PACKAGING CORPORATION OF AMERICA - FILER CITY MILL | FILER CITY, Manistee, MI | Fail | State |
| 2025-09-18 | COVERT GENERATING STATION — high-priority violation on file | COVERT, Van Buren, MI | Pass | State |
| 2025-09-18 | COVERT GENERATING STATION — high-priority violation on file | COVERT, Van Buren, MI | Pass | State |
| 2025-09-18 | PREGIS | MARYSVILLE, St. Clair, MI | Pass | State |
| 2025-09-18 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2025-09-18 | SARA LEE FROZEN BAKERY, LLC | TARBORO, Edgecombe, NC | Pass | State |
| 2025-09-18 | SILGAN CONTAINERS — high-priority violation on file | MAXTON, Robeson, NC | Pass | State |
| 2025-09-18 | BRAEN ROYALTY LLC — high-priority violation on file | SPARTA, Sussex, NJ | Fail | State |
| 2025-09-18 | SIMON CAMAMILE SOUTH TB | LA HUERTA, Eddy, NM | Pass | State |
| 2025-09-18 | PERSEUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-09-18 | REDHAWK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-18 | REDHAWK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-18 | ALBANY COUNTY WATER PURIFICATION DISTRICT - NORTH PLANT | MENANDS, Albany, NY | Pass | State |
| 2025-09-18 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-09-18 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-09-18 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-09-18 | ASCENT RESOURCES - UTICA LLC - HAMMACK CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-09-18 | ASCENT RESOURCES - UTICA LLC - HAMMACK CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-09-18 | ASCENT RESOURCES - UTICA LLC - HAMMACK CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-09-18 | ABBOTT NUTRITION - TIPP CITY | TIPP CITY, Miami, OH | Pass | State |
| 2025-09-18 | ABBOTT NUTRITION - TIPP CITY | TIPP CITY, Miami, OH | Pass | State |
| 2025-09-18 | ABBOTT NUTRITION - TIPP CITY | TIPP CITY, Miami, OH | Pass | State |
| 2025-09-18 | THE MEDICAL CENTER COMPANY | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2025-09-18 | THE MEDICAL CENTER COMPANY | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2025-09-18 | CONTINENTAL RESOURCES / SHERIFF GARRETT 2 SHERIFF GARRETT 5 | RATLIFF CITY, Garvin, OK | Pass | State |
| 2025-09-18 | EUREKA STONE QUARRY/CHALFONT QUARRY & ASPHALT PLT | CHALFONT, Bucks, PA | Pass | State |
| 2025-09-18 | ABINGTON MEM HOSP/ABINGTON | ABINGTON, Montgomery, PA | Pass | State |
| 2025-09-18 | MARKWEST LIBERTY BLUESTONE LLC/BLUESTONE GAS PROC PLT | EVANS CITY, Butler, PA | Pass | State |
| 2025-09-18 | 2G-SPE-1 LLC - CHP MEDTRONIC JUNCOS | JUNCOS, Juncos, PR | Pass | U.S. EPA |
| 2025-09-18 | MEDTRONIC MEDREL | VILLALBA, Villalba, PR | Pass | U.S. EPA |
| 2025-09-18 | BOSTON SCIENTIFIC CORPORATION — high-priority violation on file | COVENTRY, Kent, RI | Pass | State |
| 2025-09-18 | CENTURY ALUMINUM OF SOUTH CAROLINA INC — high-priority violation on file | GOOSE CREEK, Berkeley, SC | Fail | State |
| 2025-09-18 | NAN YA PLASTICS CORPORATION AMERICA | LAKE CITY, Williamsburg, SC | Pass | State |
| 2025-09-18 | BOGGS MATERIALS INC ELGIN PLANT | ELGIN, Kershaw, SC | Pass | State |
| 2025-09-18 | THE CHEMOURS INGLESIDE PLANT | GREGORY, San Patricio, TX | N/A | State |
| 2025-09-18 | LEWIN ASPHALT INC - PORTABLE 81715 | WINCHESTER, Frederick, VA | Pass | State |
| 2025-09-18 | QTS RICHMOND DATA CENTER — high-priority violation on file | SANDSTON, Henrico, VA | Pass | State |
| 2025-09-18 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-09-18 | CHEMTRADE SOLUTIONS LLC | ANACORTES, Skagit, WA | Pass | Local |
| 2025-09-18 | FELMAN PRODUCTION, LLC, LETART | LETART, Mason, WV | Pass | State |
| 2025-09-18 | ANTERO MIDSTREAM LLC, MIDDLEBOURNE V | MIDDLEBOURNE, Tyler, WV | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.