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 |
|---|---|---|---|---|
| 2025-09-30 | MISSISSIPPI POWER COMPANY, DAVID M RATCLIFFE | DEKALB, Kemper, MS | Pass | State |
| 2025-09-30 | CITY OF WILSON - WIGGINS MILL PUMPING STREET | WILSON, Wilson, NC | Pass | State |
| 2025-09-30 | ANDEAVOR FIELD SERVICES LLC - STANLEY COMPRESSOR STATION - AQ | STANLEY, Mountrail, ND | Pass | State |
| 2025-09-30 | FULL HOUSE 30 FED BATTERY #1 | MALAGA, Eddy, NM | Pass | State |
| 2025-09-30 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-09-30 | EUNICE GAS PROCESSING PLANT — high-priority violation on file | EUNICE, Lea, NM | Pass | State |
| 2025-09-30 | EUNICE GAS PROCESSING PLANT — high-priority violation on file | EUNICE, Lea, NM | Pass | State |
| 2025-09-30 | EOG - BODACIOUS LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-09-30 | EOG - BODACIOUS LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-09-30 | GIPPLE A CTB | JAL, Lea, NM | Pass | State |
| 2025-09-30 | GOLD QUARRY OPERATIONS — high-priority violation on file | CARLIN, Eureka, NV | Pass | State |
| 2025-09-30 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-09-30 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-09-30 | AMERICAN PACKAGING CORP | CHILI, Monroe, NY | Pass | State |
| 2025-09-30 | INDUSTRIAL CONTAINER SERVICES, LLC — high-priority violation on file | GAHANNA, Franklin, OH | Fail | State |
| 2025-09-30 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-09-30 | MIAMI FORT POWER COMPANY LLC | NORTH BEND, Hamilton, OH | Pass | State |
| 2025-09-30 | MATERIAL PRODUCERS INC / DAVIS CRUSHING PLANT | DAVIS, Murray, OK | Pass | State |
| 2025-09-30 | HF SINCLAIR TULSA REFINING LLC / TULSA REFINERY EAST — high-priority violation on file | TULSA, Tulsa, OK | Pass | State |
| 2025-09-30 | LATROBE SPECIALTY METALS/ A CARPENTER CO | LATROBE, Westmoreland, PA | Pass | State |
| 2025-09-30 | NATL FUEL GAS SUPPLY/ELLISBURG STA | ELLISBURG, Potter, PA | Pass | State |
| 2025-09-30 | MERSEN USA/ST MARYS | SAINT MARYS, Elk, PA | Pass | State |
| 2025-09-30 | LEWIS RUN GAS PLANT LLC/LEWIS RUN GAS PLANT | BRADFORD, McKean, PA | Pass | State |
| 2025-09-30 | BKV OPR LLC/P & G WAREHOUSE PAD | MESHOPPEN, Wyoming, PA | Pass | State |
| 2025-09-30 | EQM GATHERING OPCO LLC/SNAPPING TURTLE COMP STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-09-30 | EXPAND OPERATING LLC/MARIS SUS PAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-09-30 | RESONAC GRAPHITE AMERICA INC — high-priority violation on file | RIDGEVILLE, Dorchester, SC | Pass | State |
| 2025-09-30 | SATTERFIELD CONSTRUCTION COMPANY | NEWBERRY, Newberry, SC | Pass | State |
| 2025-09-30 | TENNESSEE VALLEY AUTHORITY - CUMBERLAND FOSSIL PLANT — high-priority violation on file | CUMBERLAND CITY, Stewart, TN | Pass | State |
| 2025-09-30 | THE ROBINETTE COMPANY DBA PINEY FLATS LAMINATION FACILITY | PINEY FLATS, Sullivan, TN | Pass | State |
| 2025-09-30 | GODLEY PLANT | GODLEY, Johnson, TX | Pass | State |
| 2025-09-30 | AMRIZE CEMENT/FORMERLY HOLCIM (US), INC. — high-priority violation on file | MORGAN, Morgan, UT | Pass | State |
| 2025-09-30 | WISCONSIN ELECTRIC POWER COMPANY (DBA WE ENERGIES) - ROTHSCHILD BIOMASS COGENERA — high-priority violation on file | ROTHSCHILD, Marathon, WI | Pass | State |
| 2025-09-30 | AMERICAN WOODMARK CORPORATION, SOUTH BRANCH | MOOREFIELD, Hardy, WV | Pass | State |
| 2025-09-30 | MONONGAHELA POWER COMPANY, FORT MARTIN STATION | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2025-09-30 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-30 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-30 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-30 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-30 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-29 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-09-29 | ALABAMA POWER COMPANY | WILSONVILLE, Shelby, AL | Pass | State |
| 2025-09-29 | DESOTO GATHERING COMPANY, LLC - PHILLIPS MOUNTAIN CPF-2 | CLEVELAND, Conway, AR | Pass | State |
| 2025-09-29 | DESOTO GATHERING COMPANY LLC - PIKE CPF-1 | HATTIEVILLE, Conway, AR | Pass | State |
| 2025-09-29 | MERIT ENERGY- TURKEY KNOB BOOSTER STATION | PARIS, Logan, AR | Pass | State |
| 2025-09-29 | MITSUBISHI CEMENT CO — high-priority violation on file | LUCERNE VALLEY, San Bernardino, CA | Pass | Local |
| 2025-09-29 | MITSUBISHI CEMENT CO — high-priority violation on file | LUCERNE VALLEY, San Bernardino, CA | Pass | Local |
| 2025-09-29 | TESORO REFINING MARKETING COMPANY LLC | SOUTH GATE, Los Angeles, CA | Pass | Local |
| 2025-09-29 | TESORO REFINING MARKETING COMPANY LLC | SOUTH GATE, Los Angeles, CA | Pass | Local |
| 2025-09-29 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-09-29 | SIKORSKY AIRCRAFT - MAIN PLANT | STRATFORD, Fairfield, CT | Pass | State |
| 2025-09-29 | BURKE CORP | NEVADA, Story, IA | Pass | State |
| 2025-09-29 | BURKE CORP | NEVADA, Story, IA | Pass | State |
| 2025-09-29 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-29 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-29 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-29 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-29 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-29 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-29 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-29 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-29 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-09-29 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-09-29 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-09-29 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-09-29 | APAC ATLANTIC INC. DBA APAC ASHEVILLE - RUTHERFORDTON PLANT | RUTHERFORDTON, Rutherford, NC | Pass | State |
| 2025-09-29 | EOG - RED HILLS SOLAR LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-09-29 | EOG - RED HILLS SOLAR LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-09-29 | NAGEEZI UNIT L26 CTB | NAGEEZI, San Juan, NM | Pass | State |
| 2025-09-29 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-09-29 | EOG RESOURCES, INC. - STITT CR UNI PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2025-09-29 | EOG RESOURCES, INC. - STITT CR UNI PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2025-09-29 | EOG RESOURCES, INC. - STITT CR UNI PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2025-09-29 | WALLEYE POWER, LLC, BAY SHORE PLANT | OREGON, Lucas, OH | Pass | State |
| 2025-09-29 | MEDINA COMPRESSOR STATION | MEDINA, Medina, OH | Pass | State |
| 2025-09-29 | AMRIZE SOUTH CENTRAL INC / COLEMAN QUARRY | COLEMAN, Johnston, OK | Pass | State |
| 2025-09-29 | HF SINCLAIR TULSA REFINING LLC / TULSA REFINERY EAST — high-priority violation on file | TULSA, Tulsa, OK | Pass | State |
| 2025-09-29 | RAUSCH CREEK GENERATION LLC/FRAILEY TWP — high-priority violation on file | TREMONT, Schuylkill, PA | Pass | State |
| 2025-09-29 | NATL FUEL SUPPLY CORP/BUFFALO COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-09-29 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pass | State |
| 2025-09-29 | AMRIZE CEMENT/FORMERLY HOLCIM (US), INC. — high-priority violation on file | MORGAN, Morgan, UT | Pass | State |
| 2025-09-29 | AMRIZE CEMENT/FORMERLY HOLCIM (US), INC. — high-priority violation on file | MORGAN, Morgan, UT | Pass | State |
| 2025-09-29 | QUAD/GRAPHICS INC - LOMIRA | LOMIRA, Dodge, WI | Pass | State |
| 2025-09-29 | WMWI - METRO RECYCLING & DISPOSAL | FRANKLIN, Monroe, WI | Pass | State |
| 2025-09-29 | ARCADIA MUNICIPAL ELECTRIC | ARCADIA, Vernon, WI | Pass | State |
| 2025-09-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-29 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-28 | ROCKY MT MIDSTREAM- KEENESBURG GAS PLANT | KEENESBURG, Weld, CO | Pass | State |
| 2025-09-28 | NAGEEZI UNIT M25 CTB | NAGEEZI, San Juan, NM | Pass | State |
| 2025-09-27 | HM SOUTHEAST CEMENT LLC | HARLEYVILLE, Dorchester, SC | Pass | State |
| 2025-09-26 | WELLBORN CABINETS INC | ASHLAND, Clay, AL | Pass | State |
| 2025-09-26 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Fail | State |
| 2025-09-26 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.