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 |
|---|---|---|---|---|
| 2025-12-31 | 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 | 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 (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 |
| 2025-12-19 | GP CELLULOSE ALABAMA RIVER CELLULOSE LLC | PERDUE HILL, Monroe, AL | Pass | State |
| 2025-12-19 | LA CITY DWP- VALLEY GENERATING STN | SUN VALLEY, Los Angeles, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.