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 |
|---|---|---|---|---|
| 2025-12-31 | PDC ENERGY INC - CALIFORNIA 14 SEC HZ | EATON AREA, Weld, CO | Pass | State |
| 2025-12-31 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2025-12-31 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2025-12-31 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2025-12-31 | TURKEY TRACK CENTRAL GAS LIFT STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2025-12-31 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-31 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-31 | CAMINO BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2025-12-31 | CENTURY ALUMINUM OF SOUTH CAROLINA INC — high-priority violation on file | GOOSE CREEK, Berkeley, SC | Fail | State |
| 2025-12-30 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2025-12-30 | PDC ENERGY, INC. - STOUT 18 SEC HZ | SEVERANCE AREA, Weld, CO | Pass | State |
| 2025-12-30 | JAX LNG LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-12-30 | JAX LNG LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-12-30 | JAX LNG LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-12-30 | HAWAIIAN CEMENT - HALAWA | AIEA, Honolulu, HI | Pass | State |
| 2025-12-30 | CABOT CORPORATION - HOPKINSVILLE FACILITY — high-priority violation on file | HOPKINSVILLE, Christian, KY | Pass | State |
| 2025-12-30 | REPUBLIC SERVICES OF KY LLC - EPPERSON WASTE DISPOSAL | WILLIAMSTOWN, Grant, KY | Pass | State |
| 2025-12-30 | SHINTECH LOUISIANA LLC - SHINTECH PLAQUEMINE PLANT | PLAQUEMINE, Iberville, LA | Pass | State |
| 2025-12-30 | SAPPI NORTH AMERICA, INC. | SKOWHEGAN, Somerset, ME | Pass | State |
| 2025-12-30 | WILLISTON BASIN - MONARCH STATION | BAKER, Fallon, MT | Pass | State |
| 2025-12-30 | WILLISTON BASIN - MONARCH STATION | BAKER, Fallon, MT | Pass | State |
| 2025-12-30 | DAKOTA GASIFICATION COMPANY (DGC) - GREAT PLAINS SYNFUELS PLANT - AQ | BEULAH, Mercer, ND | Pass | State |
| 2025-12-30 | SPUD MUFFIN 31 CTB 2 AND HARROUN TRUST 31 5H BATTERY | MALAGA, Eddy, NM | Pass | State |
| 2025-12-30 | GHOST RIDER NORTH SATELLITE AND GAS LIFT | JAL, Lea, NM | Pass | State |
| 2025-12-30 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-12-30 | GOWANUS GENERATING STATION | BROOKLYN, Kings, NY | Pass | State |
| 2025-12-30 | EMERSON BELLE OHI -UTICA PAD 1 952455 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-12-30 | EMERSON BELLE OHI -UTICA PAD 1 952455 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-12-30 | EMERSON BELLE OHI -UTICA PAD 1 952455 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-12-30 | CHIEF OIL & GAS TAGUE WEST COMPRESSOR | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-12-30 | EXPAND OPERATING LLC/FOLTA BRA PAD | LACEYVILLE, Bradford, PA | Pass | State |
| 2025-12-30 | EXPAND OPERATING LLC/KATHRYN BRA PAD | WYALUSING, Bradford, PA | Pass | State |
| 2025-12-30 | SOUTH UTAH VALLEY SOLID/BAYVIEW LANDFILL | ELBERTA, Utah, UT | Pass | State |
| 2025-12-30 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-30 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-29 | COLLINS TREE SERVICE PIT | NEWPORT, Carteret, NC | Pass | State |
| 2025-12-29 | EL CAMPEON CTB 17S | JAL, Lea, NM | Pass | State |
| 2025-12-29 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Incomplete | State |
| 2025-12-29 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Incomplete | State |
| 2025-12-29 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-12-29 | WILLIAMS OHIO VALLEY MIDSTREAM LLC, FT. BEELER | CAMERON, Marshall, WV | Pass | State |
| 2025-12-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-27 | CINCINNATI CHILDREN'S HOSPITAL MEDICAL CENTER | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-12-27 | CINCINNATI CHILDREN'S HOSPITAL MEDICAL CENTER | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-12-27 | CINCINNATI CHILDREN'S HOSPITAL MEDICAL CENTER | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-12-24 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2025-12-24 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2025-12-24 | TENNESSEE VALLEY AUTHORITY - CUMBERLAND FOSSIL PLANT — high-priority violation on file | CUMBERLAND CITY, Stewart, TN | Pass | State |
| 2025-12-23 | STATE OF CALIFORNIA PRISON - SACRAMENTO | REPRESA, Sacramento, CA | Pass | Local |
| 2025-12-23 | CARGILL, INCORPORATED | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-23 | NOBLE ENERGY - LD22-A ECONODE T9N-R58W-S | RAYMER 8.0 MI. N OF, Weld, CO | Pass | State |
| 2025-12-23 | PDC ENERGY - MARKET FEDERAL 18 SEC HZ | AULT AREA, Weld, CO | Pass | State |
| 2025-12-23 | MONTGOMERY COUNTY RRF — high-priority violation on file | DICKERSON, Montgomery, MD | Fail | State |
| 2025-12-23 | CAMACHO COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-12-23 | PPP FUTURE DEV INC/WARREN | SUGAR GROVE, Warren, PA | Pass | State |
| 2025-12-23 | PRESS ENTERPRISE/BLOOMSBURG PLT | BLOOMSBURG, Columbia, PA | Pass | State |
| 2025-12-23 | SANTEE COOPER WINYAH GENERATING STATION | GEORGETOWN, Georgetown, SC | Pass | State |
| 2025-12-22 | GP CELLULOSE ALABAMA RIVER CELLULOSE LLC | PERDUE HILL, Monroe, AL | Pass | State |
| 2025-12-22 | GP CELLULOSE ALABAMA RIVER CELLULOSE LLC | PERDUE HILL, Monroe, AL | Pass | State |
| 2025-12-22 | LANIER PALLET RECYCLING, INC. | COMMERCE, Jackson, GA | Pass | State |
| 2025-12-22 | SKC, INC. — high-priority violation on file | COVINGTON, Newton, GA | Pass | State |
| 2025-12-22 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-12-22 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-12-22 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-12-22 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-12-22 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-12-22 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-12-22 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | ROCKPORT, Spencer, IN | Pass | State |
| 2025-12-22 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | ROCKPORT, Spencer, IN | Pass | State |
| 2025-12-22 | HARSHMAN CONST. - LAMONT QUARRY (AIR) | LAMONT QUARRY, Greenwood, KS | Pass | State |
| 2025-12-22 | HARSHMAN CONST. - LAMONT QUARRY (AIR) | LAMONT QUARRY, Greenwood, KS | Pass | State |
| 2025-12-22 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-12-22 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-12-22 | EASTERN MAINE MEDICAL CENTER | BANGOR, Penobscot, ME | Pass | State |
| 2025-12-22 | CENTRAL STONE COMPANY EDINA QUARRY-KC01 | EDINA, Knox, MO | Pass | State |
| 2025-12-22 | CENTRAL STONE COMPANY EDINA QUARRY-KC01 | EDINA, Knox, MO | Pass | State |
| 2025-12-22 | CENTRAL STONE COMPANY EDINA QUARRY-KC01 | EDINA, Knox, MO | Pass | State |
| 2025-12-22 | CENTRAL STONE COMPANY EDINA QUARRY-KC01 | EDINA, Knox, MO | Pass | State |
| 2025-12-22 | CENTRAL STONE COMPANY EDINA QUARRY-KC01 | EDINA, Knox, MO | Pass | State |
| 2025-12-22 | CENTRAL STONE COMPANY EDINA QUARRY-KC01 | EDINA, Knox, MO | Pass | State |
| 2025-12-22 | MACY J COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-22 | RED RAIDER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-12-22 | INDIAN FLATS BOOSTER STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-12-22 | INDIAN FLATS BOOSTER STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-12-22 | GREVEY COM TANK BATTERY | JAL, Lea, NM | Pass | State |
| 2025-12-22 | TRISTE DRAW 36-25 CTB | MALAGA, Lea, NM | Pass | State |
| 2025-12-22 | TOM STACK LLC / STONE COMPRESSOR FACILITY | KINGFISHER, Kingfisher, OK | Pass | State |
| 2025-12-22 | ROSEBURG FOREST PRODUCTS CO. — high-priority violation on file | MEDFORD, Jackson, OR | Pass | State |
| 2025-12-22 | XTO ENERGY HOMER CITY PP COMP STA/INDIANA — high-priority violation on file | HOMER CITY, Indiana, PA | Pass | State |
| 2025-12-22 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-12-22 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-22 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-22 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-22 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-21 | MR. POTATO HEAD 11 CTB 4 | MALAGA, Eddy, NM | Pass | State |
| 2025-12-20 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-20 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-20 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-20 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
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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.