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 |
|---|---|---|---|---|
| 2025-10-22 | INGENCO WHOLESALE POWER, LLC - NEW BERN | NEW BERN, Craven, NC | Pending | State |
| 2025-10-22 | BRONCO COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-22 | BRONCO COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-22 | EOG - ODIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-22 | EOG - ODIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-22 | ROCCO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-22 | ROCCO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-22 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2025-10-22 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2025-10-22 | JOHN CALLAHAN TB | JAL, Lea, NM | Pass | State |
| 2025-10-22 | GOLD QUARRY OPERATIONS — high-priority violation on file | CARLIN, Eureka, NV | Pass | State |
| 2025-10-22 | SCIOTO MATERIALS LLC | COLUMBUS, Franklin, OH | Pass | State |
| 2025-10-22 | SCIOTO MATERIALS LLC | COLUMBUS, Franklin, OH | Pass | State |
| 2025-10-22 | SCIOTO MATERIALS LLC | COLUMBUS, Franklin, OH | Pass | State |
| 2025-10-22 | EOG RESOURCES, INC. - BEARS NB BUF PAD | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-10-22 | EOG RESOURCES, INC. - BEARS NB BUF PAD | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-10-22 | EOG RESOURCES, INC. - BEARS NB BUF PAD | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-10-22 | ELCO CORP. — high-priority violation on file | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2025-10-22 | MAGNESITA REFRACTORIES/YORK — high-priority violation on file | YORK, York, PA | Pass | State |
| 2025-10-22 | TEXAS EASTERN TRANS LP/MARIETTA | MARIETTA, Lancaster, PA | Pass | State |
| 2025-10-22 | PEOPLES NATURAL GAS/EGRY STA | CLARKSBURG, Indiana, PA | Pass | State |
| 2025-10-22 | MARKWEST LIBERTY BLUESTONE LLC/VOLL COMP STA | EVANS CITY, Butler, PA | Pass | State |
| 2025-10-22 | BKV OPERATING LLC/BAKER WEST COMPRESSOR STATION | FORREST LAKE TWP, Susquehanna, PA | Pass | State |
| 2025-10-22 | EXPAND OPER LLC/ROLAND BRA PAD | WILMONT, Bradford, PA | Pass | State |
| 2025-10-22 | CABOT OIL & GAS CORP/FOLTZ J PAD 1 | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2025-10-22 | EXPAND OPERATING LLC/HOLTAN SUS WELLPAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-10-22 | MOORE, S. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-22 | CONSTANTIA BLYTHEWOOD LLC — high-priority violation on file | BLYTHEWOOD, Richland, SC | Pass | State |
| 2025-10-22 | NEW-INDY CATAWBA LLC | CATAWBA, York, SC | Pass | State |
| 2025-10-22 | NORTHWESTERN ENERGY PUBLIC SERVICE CORPORATION - ABERDEEN | ABERDEEN, Brown, SD | Pass | State |
| 2025-10-22 | PAVEMENT RESTORATIONS, INC. | MURFREESBORO, Rutherford, TN | Fail | State |
| 2025-10-22 | BEAUMONT GAS TO GASOLINE PLANT — high-priority violation on file | BEAUMONT, Jefferson, TX | N/A | State |
| 2025-10-22 | INV NYLON CHEMICALS AMERICAS ORANGE SITE — high-priority violation on file | ORANGE, Orange, TX | Pass | State |
| 2025-10-22 | INV NYLON CHEMICALS AMERICAS ORANGE SITE — high-priority violation on file | ORANGE, Orange, TX | Pass | State |
| 2025-10-22 | PACIFICORP HUNTER | UTAH, Undetermined, UT | Pass | State |
| 2025-10-22 | INTERMOUNTAIN POWER SERVICE CORPORATION | DELTA, Millard, UT | Pass | State |
| 2025-10-22 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-22 | LES PROJECT HOLDINGS, LLC F/K/A MICHIGAN CONGENERATION SYSTEMS, INC. | LORTON, Fairfax, VA | Pass | State |
| 2025-10-22 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-10-22 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-10-22 | ANTERO MIDSTREAM LLC, WEST MOUNTAIN STATION | PENNSBORO, Ritchie, WV | Pass | State |
| 2025-10-22 | COLONY PLANT (BENTONITE PERFORMANCE MINERALS) | COLONY, Crook, WY | Pass | State |
| 2025-10-21 | AURORA ENERGY LLC / CHENA POWER PLANT — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-10-21 | HILCORP ALASKA, LLC / GATHERING CENTER #2 (GC 2) | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2025-10-21 | HILCORP ALASKA, LLC / GATHERING CENTER #2 (GC 2) | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2025-10-21 | INTERNATIONAL PAPER COMPANY | PRATTVILLE, Autauga, AL | Pass | State |
| 2025-10-21 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2025-10-21 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2025-10-21 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2025-10-21 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2025-10-21 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2025-10-21 | HILCORP ENERGY COMPANY | CREOLA, Mobile, AL | Pass | State |
| 2025-10-21 | WARRIOR MET COAL GAS, LLC | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2025-10-21 | WARRIOR MET COAL GAS, LLC | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2025-10-21 | DESOTO GATHERING COMPANY, LLC - SOUTHEAST RAINBOW CPF-1 | BEE BRANCH, Conway, AR | Pass | State |
| 2025-10-21 | DESOTO GATHERING COMPANY LLC - PIKE CPF-1 | HATTIEVILLE, Conway, AR | Pass | State |
| 2025-10-21 | ANTHONY TIMBERLANDS, INC. - BEARDEN | BEARDEN, Ouachita, AR | Pass | State |
| 2025-10-21 | ENABLE GAS TRANSMISSION, LLC (HELENA COMPRESSOR STATION) | HELENA, Phillips, AR | Pass | State |
| 2025-10-21 | ENABLE MISSISSIPPI RIVER TRANSMISSION, LLC - (BIGGERS COMPRESSOR STATION) | BIGGERS, Randolph, AR | Pass | State |
| 2025-10-21 | PG&E- HINKLEY | HINKLEY, San Bernardino, CA | Pass | Local |
| 2025-10-21 | CHEVRON MINING INC | MOUNTAIN PASS, San Bernardino, CA | Pass | Local |
| 2025-10-21 | OLS ENERGY CHINO | CHINO, San Bernardino, CA | Pass | Local |
| 2025-10-21 | SIMI VALLEY LANDFILL & RECYCLING CENTER — high-priority violation on file | SIMI VALLEY, Ventura, CA | Fail | Local |
| 2025-10-21 | DCP OPERATING CO - LIBSACK C.S. | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-21 | BROWARD COUNTY WATER/WASTEWATER SERVICES | POMPANO BEACH, Broward, FL | Pass | State |
| 2025-10-21 | BROWARD COUNTY WATER/WASTEWATER SERVICES | POMPANO BEACH, Broward, FL | Pass | State |
| 2025-10-21 | BROWARD COUNTY WATER/WASTEWATER SERVICES | POMPANO BEACH, Broward, FL | Pass | State |
| 2025-10-21 | BROWARD COUNTY WATER/WASTEWATER SERVICES | POMPANO BEACH, Broward, FL | Pass | State |
| 2025-10-21 | BROWARD COUNTY WATER/WASTEWATER SERVICES | POMPANO BEACH, Broward, FL | Pass | State |
| 2025-10-21 | BROWARD COUNTY WATER/WASTEWATER SERVICES | POMPANO BEACH, Broward, FL | Pass | State |
| 2025-10-21 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2025-10-21 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-21 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-21 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-21 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-21 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-21 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-21 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-21 | REX LUMBER, BRISTOL, LLC | BRISTOL, Liberty, FL | Pass | State |
| 2025-10-21 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2025-10-21 | CERTAINTEED GYPSUM PALATKA, LLC | PALATKA, Putnam, FL | Pass | State |
| 2025-10-21 | CERTAINTEED GYPSUM PALATKA, LLC | PALATKA, Putnam, FL | Pass | State |
| 2025-10-21 | CERTAINTEED GYPSUM PALATKA, LLC | PALATKA, Putnam, FL | Pass | State |
| 2025-10-21 | KRATON CHEMICAL, LLC | SAVANNAH, Chatham, GA | Pass | State |
| 2025-10-21 | MARTA - LAREDO DRIVE CNG STATION | DECATUR, DeKalb, GA | Pass | State |
| 2025-10-21 | MARTA - LAREDO DRIVE CNG STATION | DECATUR, DeKalb, GA | Pass | State |
| 2025-10-21 | MARTA - LAREDO DRIVE CNG STATION | DECATUR, DeKalb, GA | Pass | State |
| 2025-10-21 | MARTA - LAREDO DRIVE CNG STATION | DECATUR, DeKalb, GA | Pass | State |
| 2025-10-21 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2025-10-21 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2025-10-21 | MECO - PALAAU | PALAAU, Maui, HI | Pass | State |
| 2025-10-21 | MECO - PALAAU | PALAAU, Maui, HI | Pass | State |
| 2025-10-21 | UNITED COOPERATIVE-HIGHVIEW-WEBSTER CITY | WEBSTER CITY, Hamilton, IA | Pass | State |
| 2025-10-21 | UNITED COOPERATIVE-HIGHVIEW-WEBSTER CITY | WEBSTER CITY, Hamilton, IA | Pass | State |
| 2025-10-21 | NICOR GAS | ANCONA, Livingston, IL | Pass | State |
| 2025-10-21 | NICOR GAS | ANCONA, Livingston, IL | Pass | State |
| 2025-10-21 | NICOR GAS | ANCONA, Livingston, IL | Pass | State |
| 2025-10-21 | SUNGEEL RECYCLING PARK INDIANA LLC | WHITESTOWN, Boone, IN | Pass | State |
| 2025-10-21 | SUNGEEL RECYCLING PARK INDIANA LLC | WHITESTOWN, Boone, IN | Pass | State |
| 2025-10-21 | SUNGEEL RECYCLING PARK INDIANA LLC | WHITESTOWN, Boone, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.