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 |
|---|---|---|---|---|
| 2025-10-06 | VULCAN METALS CORPORATION - ATCHISON (AIR) | ATCHISON, Atchison, KS | Pass | State |
| 2025-10-06 | DOWN EAST EMULSIONS, LIMITED LIABILITY COMPANY | BANGOR, Penobscot, ME | Pass | State |
| 2025-10-06 | ANDERSEN CORPORATION | BAYPORT, Washington, MN | Pass | State |
| 2025-10-06 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2025-10-06 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2025-10-06 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2025-10-06 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2025-10-06 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2025-10-06 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2025-10-06 | CLEVELAND COUNTY C&D LANDFILL - ACI | SHELBY, Cleveland, NC | Pass | State |
| 2025-10-06 | JOHNSON BROS. UTILITY & PAVING CO., INC. - ST PAULS PLANT | SAINT PAULS, Robeson, NC | Pass | State |
| 2025-10-06 | MIYAMURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-06 | HERRADURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-06 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-06 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-06 | GHOST COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-06 | GHOST COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-06 | GHOST COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-06 | GHOST COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-06 | TITAN COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-06 | TITAN COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-06 | TITAN COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-06 | OUTLAND STATE CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-10-06 | ENLINK MIDSTREAM SERVICES LLC / SAPPHIRE COMPRESSOR STATION | CALUMET, Canadian, OK | Pass | State |
| 2025-10-06 | MATERIAL PRODUCERS INC / WASHITA QUARRY | DAVIS, Murray, OK | Pass | State |
| 2025-10-06 | ROSEBURG FOREST PRODUCTS CO. — high-priority violation on file | MEDFORD, Jackson, OR | Pass | State |
| 2025-10-06 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Pass | Local |
| 2025-10-06 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Pass | Local |
| 2025-10-06 | NORTHSIDE LANDFILL | SPOKANE, Spokane, WA | Pass | Local |
| 2025-10-06 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2025-10-06 | WPL - NEENAH GENERATING FACILITY — high-priority violation on file | NEENAH, Winnebago, WI | Pass | State |
| 2025-10-06 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-06 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-06 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-06 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-10-04 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-04 | UNIVERSITY OF NEW MEXICO-MAIN CAMPUS | ALBUQUERQUE, Bernalillo, NM | Pass | Local |
| 2025-10-03 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-10-03 | CHI HEALTH MERCY COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2025-10-03 | CHI HEALTH MERCY COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2025-10-03 | CHI HEALTH MERCY COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2025-10-03 | CHI HEALTH MERCY COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2025-10-03 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2025-10-03 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2025-10-03 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2025-10-03 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2025-10-03 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2025-10-03 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2025-10-03 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2025-10-03 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2025-10-03 | S & S ROCK CRUSHING - WITHERS PIT (AIR) | MINNEOLA, Clark, KS | Pass | State |
| 2025-10-03 | CARDINAL COLWICH LLC (AIR) — high-priority violation on file | COLWICH, Sedgwick, KS | Pass | State |
| 2025-10-03 | CARDINAL COLWICH LLC (AIR) — high-priority violation on file | COLWICH, Sedgwick, KS | Pass | State |
| 2025-10-03 | ECO MAINE | PORTLAND, Cumberland, ME | Pass | State |
| 2025-10-03 | EOG - BODACIOUS LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-10-03 | EOG - BODACIOUS LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-10-03 | RJ BOOSTER GCP4-3808 | SANTA FE, Santa Fe, NM | Pass | State |
| 2025-10-03 | WOEBER MUSTARD MFG. CO. | SPRINGFIELD, Clark, OH | Pass | State |
| 2025-10-03 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-10-03 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-10-03 | ONEIDA VALLEY MIDSTRAM LLC/CONSTELLATION COMP STA | WEST SUNBURY, Butler, PA | Pass | State |
| 2025-10-03 | INNOVATION 411/UPPER MERION — high-priority violation on file | KING OF PRUSSIA, Montgomery, PA | Pass | State |
| 2025-10-03 | COTERRA ENERGY INC/HAYNES W PAD 1 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-10-03 | WASTE MANAGEMENT, INC. OF TENNESSEE | CAMDEN, Benton, TN | Pass | State |
| 2025-10-03 | AMAZON DATA SERVICES INC IAD-210/211 | MANASSAS, Prince William, VA | Pass | State |
| 2025-10-03 | SIERRA PACIFIC INDUSTRIES - COGENERATION — high-priority violation on file | ABERDEEN, Grays Harbor, WA | Pending | Local |
| 2025-10-02 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2025-10-02 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-10-02 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-10-02 | ALBEMARLE CORPORATION-SOUTH PLANT | MAGNOLIA, Columbia, AR | Pass | State |
| 2025-10-02 | ALBEMARLE CORPORATION-SOUTH PLANT | MAGNOLIA, Columbia, AR | Pass | State |
| 2025-10-02 | ALBEMARLE CORPORATION-SOUTH PLANT | MAGNOLIA, Columbia, AR | Pass | State |
| 2025-10-02 | ALBEMARLE CORPORATION-SOUTH PLANT | MAGNOLIA, Columbia, AR | Pass | State |
| 2025-10-02 | ALBEMARLE CORPORATION-SOUTH PLANT | MAGNOLIA, Columbia, AR | Pass | State |
| 2025-10-02 | FUTUREFUEL CHEMICAL COMPANY | BATESVILLE, Independence, AR | Pass | State |
| 2025-10-02 | ARKANSAS ELECTRIC COOPERATIVE CORPORATION - ELKINS CT PLANT | ELKINS, Washington, AR | Pass | State |
| 2025-10-02 | ARKANSAS ELECTRIC COOPERATIVE CORPORATION - ELKINS CT PLANT | ELKINS, Washington, AR | Pass | State |
| 2025-10-02 | SACRAMENTO AREA SEWER DISTRICT | ELK GROVE, Sacramento, CA | Pending | Local |
| 2025-10-02 | SILGAN CONTAINERS | SACRAMENTO, Sacramento, CA | Pass | Local |
| 2025-10-02 | PHILLIPS 66 COMPANY/LA REFINERY | CARSON, Los Angeles, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-02 | EQUILON ENTERPRISES LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-10-02 | EQUILON ENTERPRISES LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-10-02 | EQUILON ENTERPRISES LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-10-02 | EQUILON ENTERPRISES LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-10-02 | EQUILON ENTERPRISES LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-10-02 | EQUILON ENTERPRISES LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-10-02 | EQUILON ENTERPRISES LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-10-02 | EQUILON ENTERPRISES LLC | STOCKTON, San Joaquin, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.