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
- California 5,448
- Ohio 2,217
- New Mexico 1,801
- Indiana 1,621
- Florida 1,425
- Wyoming 1,362
- Georgia 1,234
- Oklahoma 1,229
- Pennsylvania 957
- Missouri 772
- Alabama 693
- Mississippi 689
- Arkansas 619
- Iowa 500
- Colorado 405
- Kansas 404
- Michigan 387
- Texas 308
- North Carolina 276
- Illinois 264
- Washington 263
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 207
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 157
- North Dakota 152
- Nebraska 145
- Maine 131
- Louisiana 129
- New York 126
- Arizona 116
- Idaho 111
- Nevada 75
- New Hampshire 59
- Massachusetts 59
- Hawaii 58
- Oregon 56
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- New Jersey 11
- Vermont 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-09 | RIDGEVILLE WOOD RECYCLING COMPOST FACILITY — high-priority violation on file | RIDGEVILLE, Dorchester, SC | Pass | State |
| 2025-12-09 | BASF METALS LLC | SENECA, Oconee, SC | Pass | State |
| 2025-12-09 | TENNESSEE GAS PIPELINE COMPANY, L.L.C. | MIDDLETON, Hardeman, TN | Pass | State |
| 2025-12-09 | COLOSSUS DATA CENTER | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-12-09 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-12-09 | GLOBAL FORT WORTH TERMINAL | FORT WORTH, Tarrant, TX | N/A | State |
| 2025-12-09 | PACIFICORP HUNTER | UTAH, Undetermined, UT | Pass | State |
| 2025-12-09 | PACIFICORP HUNTER | UTAH, Undetermined, UT | Pass | State |
| 2025-12-09 | HRSD - BOAT HARBOR WASTEWATER TREATMENT PLANT | NEWPORT NEWS, Newport News (city), VA | Pass | State |
| 2025-12-09 | WALMART SUPERCENTER #4064 | VIRGINIA BEACH, Virginia Beach (city), VA | Fail | State |
| 2025-12-09 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-12-09 | HARDEL MUTUAL PLYWOOD CORPORATION — high-priority violation on file | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-12-09 | GREEN MEADOWS RNG, LLC | CHILTON, Calumet, WI | Pass | State |
| 2025-12-09 | CASCADES TISSUE GROUP - WI INC | EAU CLAIRE, Eau Claire, WI | Pass | State |
| 2025-12-09 | MCKINLEY PAPER AND PACKAGING COMPANY — high-priority violation on file | COMBINED LOCKS, Ozaukee, WI | Pass | State |
| 2025-12-09 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2025-12-09 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-09 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 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 | UCD MEDICAL CENTER | SACRAMENTO, Sacramento, CA | Pass | Local |
| 2025-12-05 | SOUTHERN CALIF GAS CO | MARICOPA, Kern, CA | Pass | Local |
| 2025-12-05 | SOUTHERN CALIF GAS CO | MARICOPA, Kern, CA | Pass | Local |
| 2025-12-05 | SOUTHERN CALIF GAS CO | MARICOPA, Kern, CA | Pass | Local |
| 2025-12-05 | SOUTHERN CALIF GAS CO | MARICOPA, Kern, CA | Pass | Local |
| 2025-12-05 | SOUTHERN CALIF GAS CO | MARICOPA, Kern, CA | Pass | Local |
| 2025-12-05 | SOUTHERN CALIF GAS CO | MARICOPA, Kern, CA | Pass | Local |
| 2025-12-05 | SOUTHERN CALIF GAS CO | MARICOPA, Kern, CA | Pass | Local |
| 2025-12-05 | SOUTHERN CALIF GAS CO | MARICOPA, Kern, CA | Pass | Local |
| 2025-12-05 | SOUTHERN CALIF GAS CO | MARICOPA, Kern, CA | 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 |
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.