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 |
|---|---|---|---|---|
| 2025-10-01 | MATCHBOX COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-01 | TOMAHAWK 30 B CTB | MALAGA, Eddy, NM | Pass | State |
| 2025-10-01 | TOMAHAWK 30 B CTB | MALAGA, Eddy, NM | Pass | State |
| 2025-10-01 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-01 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-01 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-01 | VAN DOO DAH 33 CTB 3 | MALAGA, Lea, NM | Pass | State |
| 2025-10-01 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-10-01 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-10-01 | INDUSTRIAL CONTAINER SERVICES, LLC — high-priority violation on file | GAHANNA, Franklin, OH | Pass | State |
| 2025-10-01 | BOSTIK, INC. | ASHLAND, Ashland, OH | Pass | State |
| 2025-10-01 | ROBERT P. MONE PLANT | CONVOY, Van Wert, OH | Pass | State |
| 2025-10-01 | ROBERT P. MONE PLANT | CONVOY, Van Wert, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | BLUE RACER MIDSTREAM, LLC - HAYES STATION | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-10-01 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-10-01 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-10-01 | MIDDLETOWN COKE COMPANY, LLC — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2025-10-01 | MIAMI FORT POWER COMPANY LLC | NORTH BEND, Hamilton, OH | Pass | State |
| 2025-10-01 | ET GATHERING PROCESSING LLC / HAYSTACK COMPRESSOR STATION | WATONGA, Blaine, OK | Pass | State |
| 2025-10-01 | MERSEN USA/ST MARYS | SAINT MARYS, Elk, PA | Pass | State |
| 2025-10-01 | NFG MIDSTREAM COVINGTON LLC/NETTERMAN COMP STA | WELLSBORO, Tioga, PA | Pass | State |
| 2025-10-01 | EQM GATHERING OPCO LLC/SNAPPING TURTLE COMP STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-10-01 | CABOT OIL & GAS CORP/KROPA, T. PAD 1 | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-10-01 | COTERRA ENERGY INC/ADAMS J PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-10-01 | CONSTELLATION GENERATION CO/DELAWARE STA | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-10-01 | CONSTELLATION GENERATION CO/DELAWARE STA | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-10-01 | RESONAC GRAPHITE AMERICA INC — high-priority violation on file | RIDGEVILLE, Dorchester, SC | Pass | State |
| 2025-10-01 | TRANSCONTINENTAL GAS PIPELINE - STATION 175 | SCOTTSVILLE, Fluvanna, VA | Pass | State |
| 2025-10-01 | COVENTRY CLEAN ENERGY CORPORATION — high-priority violation on file | COVENTRY, Orleans, VT | Pass | State |
| 2025-10-01 | AMERICAN PACKAGING CORP | COLUMBUS, Columbia, WI | Pass | State |
| 2025-10-01 | ANTERO MIDSTREAM LLC, CASTLE PEAK STN | NEW MARTINSVILLE, Tyler, WV | Pass | State |
| 2025-10-01 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-01 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-01 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-01 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-01 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-01 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-30 | SOUTHERN NATURAL GAS | GALLION, Hale, AL | Pass | State |
| 2025-09-30 | SOUTHERN NATURAL GAS | GALLION, Hale, AL | Pass | State |
| 2025-09-30 | WESTROCK MILL COMPANY LLC | DEMOPOLIS, Marengo, AL | Pass | State |
| 2025-09-30 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | SWEET WATER, Marengo, AL | Pass | State |
| 2025-09-30 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | SWEET WATER, Marengo, AL | Pass | State |
| 2025-09-30 | CHEROKEE SANITARY LANDFILL COMPANY | CHEROKEE VILLAGE, Fulton, AR | Pass | State |
| 2025-09-30 | PLUM POINT SERVICES COMPANY, LLC - PLUM POINT ENERGY STATION | OSCEOLA, Mississippi, AR | Pass | State |
| 2025-09-30 | NUCOR COATINGS CORPORATION - BLYTHEVILLE PLANT | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2025-09-30 | DESOTO GATHERING COMPANY, LLC - SW GREER LAKE CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2025-09-30 | DESOTO GATHERING COMPANY, LLC - SW GREER LAKE CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2025-09-30 | MONTEREY ONE WATER (PREVIOUSLY MONTEREY REGIONAL WTR POLLUTION CTRL) | MARINA, Monterey, CA | Pass | Local |
| 2025-09-30 | SUNCOR ENERGY - DENVER REFINERY — high-priority violation on file | COMMERCE CITY, Adams, CO | Pass | State |
| 2025-09-30 | SIKORSKY AIRCRAFT - MAIN PLANT | STRATFORD, Fairfield, CT | Pass | State |
| 2025-09-30 | AHLSTROM NONWOVENS, LLC | WINDSOR LOCKS, Hartford, CT | Pass | State |
| 2025-09-30 | REWORLD CONNECTICUT COMPANY — high-priority violation on file | PRESTON, New London, CT | Pass | State |
| 2025-09-30 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Fail | State |
| 2025-09-30 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Fail | State |
| 2025-09-30 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2025-09-30 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2025-09-30 | MURPHY OIL USA, INC. | TAMPA, Hillsborough, FL | Pass | State |
| 2025-09-30 | J P SMITH LUMBER COMPANY | MENLO, Chattooga, GA | Pass | State |
| 2025-09-30 | ATLANTA GAS LIGHT COMPANY - RIVERDALE LNG PLANT — high-priority violation on file | RIVERDALE, Clayton, GA | Pass | State |
| 2025-09-30 | ALUDYNE COLUMBUS LLC | COLUMBUS, Muscogee, GA | Pass | State |
| 2025-09-30 | ALUDYNE COLUMBUS LLC | COLUMBUS, Muscogee, GA | Pass | State |
| 2025-09-30 | SOUTHERN NATURAL GAS COMPANY, LLC - THOMASTON COMPRESSOR STATION | THOMASTON, Upson, GA | Pass | State |
| 2025-09-30 | HECO - KAHE | KAPOLEI, Honolulu, HI | Pass | State |
| 2025-09-30 | ITAFOS CONDA LLC - TV FACILITY | SODA SPRINGS, Caribou, ID | Pass | State |
| 2025-09-30 | E.T. SIMONDS MATERIALS CO | MT VERNON, Jefferson, IL | Fail | State |
| 2025-09-30 | E.T. SIMONDS MATERIALS CO | MT VERNON, Jefferson, IL | Fail | State |
| 2025-09-30 | NICOR GAS | TROY GROVE, La Salle, IL | Pass | State |
| 2025-09-30 | NICOR GAS | TROY GROVE, La Salle, IL | Pass | State |
| 2025-09-30 | BF GOODRICH TIRE MANUFACTURING | WOODBURN, Allen, IN | Pass | State |
| 2025-09-30 | ALPHA BAKING COMPANY INCORPORATED — high-priority violation on file | LA PORTE, LaPorte, IN | Pass | State |
| 2025-09-30 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-09-30 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-09-30 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-09-30 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-09-30 | KANSAS ETHANOL (AIR) | LYONS, Rice, KS | Pass | State |
| 2025-09-30 | KANSAS CITY BPU - NEARMAN (AIR) | KANSAS CITY, Wyandotte, KS | Pass | State |
| 2025-09-30 | KANSAS CITY BPU - NEARMAN (AIR) | KANSAS CITY, Wyandotte, KS | Pass | State |
| 2025-09-30 | KANSAS PAVING (AIR CURT COMB) (PORTABLE)(AIR) | WICHITA, Sedgwick, KS | Pass | State |
| 2025-09-30 | ECO MAINE | PORTLAND, Cumberland, ME | Pass | State |
| 2025-09-30 | GRAND RAPIDS WASTEWATER TREATMENT PLANT | GRAND RAPIDS, Kent, MI | Pass | State |
| 2025-09-30 | J. H. CAMPBELL PLANT | WEST OLIVE, Ottawa, MI | Pass | State |
| 2025-09-30 | DTE ELECTRIC COMPANY - GREENWOOD ENERGY CENTER | KENOCKEE, St. Clair, MI | Pass | State |
| 2025-09-30 | DTE GAS COMPANY - MILFORD COMPRESSOR STATION | MILFORD, Oakland, MI | Pass | State |
| 2025-09-30 | ASAMA COLDWATER MANUFACTURING, INC. | COLDWATER, Branch, MI | Pass | State |
| 2025-09-30 | MCNAMARA CONTRACTING INC | ROSEMOUNT, Dakota, MN | Pass | State |
| 2025-09-30 | GREAT LAKES GAS TRANSMISSION - STATION 1 | SAINT VINCENT, Kittson, MN | N/A | State |
| 2025-09-30 | ADM - MARSHALL | MARSHALL, Lyon, MN | Pass | State |
| 2025-09-30 | BULK SILOS | SAINT PAUL, Ramsey, MN | Pass | State |
| 2025-09-30 | WISCONSIN CENTRAL LTD | DULUTH, St. Louis, MN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.