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 |
|---|---|---|---|---|
| 2025-12-09 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-08 | DESOTO GATHERING COMPANY, LLC - WEST CUTTHROAT CPF-1 | QUITMAN, Cleburne, AR | Pass | State |
| 2025-12-08 | DESOTO GATHERING COMPANY, LLC - WEST CUTTHROAT CPF-1 | QUITMAN, Cleburne, AR | Pass | State |
| 2025-12-08 | BLACK HILLS ENERGY ARKANSAS, INC. - WOOLSEY COMPRESSOR STATION | OZARK, Franklin, AR | Pass | State |
| 2025-12-08 | BLACK HILLS ENERGY ARKANSAS, INC. - WOOLSEY COMPRESSOR STATION | OZARK, Franklin, AR | Pass | State |
| 2025-12-08 | BLACK HILLS ENERGY ARKANSAS, INC. - DRAKE COMPRESSOR STATION | OZARK, Franklin, AR | Pass | State |
| 2025-12-08 | BLACK HILLS ENERGY ARKANSAS, INC. - DRAKE COMPRESSOR STATION | OZARK, Franklin, AR | Pass | State |
| 2025-12-08 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Fail | Local |
| 2025-12-08 | LUNDAY-THAGARD CO DBA WORLD OIL REFINING — high-priority violation on file | SOUTH GATE, Los Angeles, CA | Pass | Local |
| 2025-12-08 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-12-08 | TPSI TERMINALS LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2025-12-08 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-08 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-08 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-08 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-08 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-08 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-08 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-08 | FLORIDA MUNICIPAL POWER AGENCY | BARTOW, Polk, FL | Pass | State |
| 2025-12-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2025-12-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2025-12-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2025-12-08 | GSA FEDERAL RESEARCH CENTER AT WHITE OAK | SILVER SPRING, Montgomery, MD | Pass | State |
| 2025-12-08 | EASTON UTILITIES - AIRPORT PARK | EASTON, Talbot, MD | Pass | State |
| 2025-12-08 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2025-12-08 | TIGER BOOSTER STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-12-08 | DARK STAR COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-08 | DARK STAR COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-08 | DARK STAR COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-08 | DARK STAR COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-08 | MIMOSA 18 CTB 1 | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-08 | PADUCA BREAKS CENTRAL GATHERING FACILITY | JAL, Lea, NM | Pass | State |
| 2025-12-08 | PADUCA BREAKS CENTRAL GATHERING FACILITY | JAL, Lea, NM | Pass | State |
| 2025-12-08 | JOHN CALLAHAN TB | JAL, Lea, NM | Pass | State |
| 2025-12-08 | MGM RESORTS INTERNATIONAL — high-priority violation on file | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-12-08 | MGM RESORTS INTERNATIONAL — high-priority violation on file | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-12-08 | 20 HUDSON YARDS | NEW YORK, New York, NY | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - COLEMAN WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - COLEMAN WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - COLEMAN WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - THREE DADS RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - THREE DADS RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - THREE DADS RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | GULFPORT APPALACHIA, LLC - BOY SCOUT WELL PAD | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-12-08 | GULFPORT APPALACHIA, LLC - BOY SCOUT WELL PAD | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-12-08 | GULFPORT APPALACHIA, LLC - BOY SCOUT WELL PAD | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-12-08 | TEXAS EASTERN TRANS LP/ENTRIKEN STA | ENTRIKEN, Huntingdon, PA | Pass | State |
| 2025-12-08 | TEXAS EASTERN TRANS LP/ENTRIKEN STA | ENTRIKEN, Huntingdon, PA | Pass | State |
| 2025-12-08 | COLOSSUS DATA CENTER | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-12-08 | TESLA | AUSTIN, Travis, TX | N/A | State |
| 2025-12-08 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-08 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-08 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-06 | SEAPORT CANAVERAL CORP. | CAPE CANAVERAL, Brevard, FL | Pass | State |
| 2025-12-06 | NIEHS | RESEARCH TRIANGLE PARK, Durham, NC | Pass | State |
| 2025-12-06 | NAILED IT B COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-06 | BIOMASS ONE, L.P. — high-priority violation on file | WHITE CITY, Jackson, OR | Pass | State |
| 2025-12-05 | HILCORP ALASKA, LLC / BELUGA RIVER UNIT — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2025-12-05 | HILCORP ALASKA, LLC / BELUGA RIVER UNIT — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2025-12-05 | HILCORP ALASKA, LLC / BELUGA RIVER UNIT — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2025-12-05 | DESOTO GATHERING COMPANY, LLC - NORTHWEST CHARLEY CPF-2 | GREERS FERRY, Cleburne, AR | Pass | State |
| 2025-12-05 | ALTERNATIVE WASTE MANAGEMENT LLC | MAYFLOWER, Faulkner, AR | Pass | State |
| 2025-12-05 | QTS GLENDALE I | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-12-05 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-05 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-05 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-05 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-05 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-05 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-05 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-05 | A WILBERTS SONS 89 #1-ALT & 89 #2 TANK BATTERY - ERWINVILLE FIELD | ERWINVILLE, West Baton Rouge, LA | Pass | State |
| 2025-12-05 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 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 |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.