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 |
|---|---|---|---|---|
| 2025-09-02 | TALL OAK WOODFORD LLC / TREE HOUSE COMPRESSOR FACILITY | MCALESTER, Pittsburg, OK | Pass | State |
| 2025-09-02 | TALL OAK WOODFORD LLC / TREE HOUSE COMPRESSOR FACILITY | MCALESTER, Pittsburg, OK | Pass | State |
| 2025-09-02 | TALL OAK WOODFORD LLC / TREE HOUSE COMPRESSOR FACILITY | MCALESTER, Pittsburg, OK | Pass | State |
| 2025-09-02 | TALL OAK WOODFORD LLC / TREE HOUSE COMPRESSOR FACILITY | MCALESTER, Pittsburg, OK | Pass | State |
| 2025-09-02 | EBENSBURG POWER CO/EBENSBURG COGENERATION PLT | EBENSBURG, Cambria, PA | Pass | State |
| 2025-09-02 | WRIGHT, W. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-09-02 | VANDERMARK, R. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-09-02 | ASPEN SURGICAL PR CORP | LAS PIEDRAS, Las Piedras, PR | Pass | U.S. EPA |
| 2025-09-02 | PATHEON PUERTO RICO INC (FORMER MOVA) | MANATI, Manati, PR | Pass | U.S. EPA |
| 2025-09-02 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-02 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-02 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-02 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-08-30 | VENTURE GLOBAL PLAQUEMINES LNG LLC - PLAQUEMINES LNG TERMINAL | PORT SULPHUR, Plaquemines, LA | Pass | State |
| 2025-08-29 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Pass | State |
| 2025-08-29 | SOUTHWESTERN ELECTIRC POWER COMPANY - HARRY D. MATTISON POWER PLANT | TONTITOWN, Washington, AR | Pass | State |
| 2025-08-29 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-29 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-29 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-29 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-29 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-29 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-29 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-29 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-29 | ARCOSA LWB LLC - LIGHTWEIGHT - BOULDER — high-priority violation on file | SUPERIOR AREA, Jefferson, CO | Pass | State |
| 2025-08-29 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2025-08-29 | OMNISOURCE LLC | FORT WAYNE, Allen, IN | Pass | State |
| 2025-08-29 | OMNISOURCE LLC | FORT WAYNE, Allen, IN | Pass | State |
| 2025-08-29 | OMNISOURCE LLC | FORT WAYNE, Allen, IN | Pass | State |
| 2025-08-29 | OMNISOURCE LLC | FORT WAYNE, Allen, IN | Pass | State |
| 2025-08-29 | SIGECO - FB CULLEY GENERATING STATION | NEWBURGH, Warrick, IN | Pass | State |
| 2025-08-29 | VENTURE GLOBAL PLAQUEMINES LNG LLC - PLAQUEMINES LNG TERMINAL | PORT SULPHUR, Plaquemines, LA | Pass | State |
| 2025-08-29 | FLINT HILLS RESOURCES PINE BEND REFINERY | ROSEMOUNT, Dakota, MN | Pass | State |
| 2025-08-29 | NC MUNICIPAL POWER AGENCY NO. 1 - MONROE MIDDLE SCHOOL UNIT | MONROE, Union, NC | Pass | State |
| 2025-08-29 | GOFFSTOWN TRANSFER STATION | GOFFSTOWN, Hillsborough, NH | Pass | State |
| 2025-08-29 | REVOLUTION COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-08-29 | EOG RESOURCES, INC. - WAGNER GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-08-29 | EOG RESOURCES, INC. - WAGNER GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-08-29 | EOG RESOURCES, INC. - WAGNER GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-08-29 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-08-29 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-08-29 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-08-29 | TARGA PIPELINE MIDCONTINENT LLC / TIVIS COMPRESSOR STATION | RATLIFF CITY, Carter, OK | Pass | State |
| 2025-08-29 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-08-29 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-08-29 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-08-29 | WALTER R EARLE ASPHALT PLT/MORRISVILLE — high-priority violation on file | MORRISVILLE, Bucks, PA | Pending | State |
| 2025-08-29 | MARKWEST LIBERTY BLUESTONE LLC/TRILLITH COMP STA | HARMONY, Butler, PA | Pass | State |
| 2025-08-29 | EXPAND OPERATING LLC/KAUFMANN WELL PAD | NEW ALBANY, Bradford, PA | Pass | State |
| 2025-08-29 | COMPANIA CERVECERA DE PUERTO RICO INC | MAYAGUEZ, Mayaguez, PR | Pass | U.S. EPA |
| 2025-08-29 | ALLEN COMBINED CYCLE PLANT - TVA | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-08-29 | HENSLEY INDUSTRIES — high-priority violation on file | DALLAS, Dallas, TX | Pass | State |
| 2025-08-29 | THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS, Dallas, TX | Pass | State |
| 2025-08-29 | MIDLOTHIAN FACILITY | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2025-08-29 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-08-29 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-08-29 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Incomplete | State |
| 2025-08-29 | ANTERO MIDSTREAM LLC, MIDDLEBOURNE III | WICK, Tyler, WV | Pass | State |
| 2025-08-29 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-08-29 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-08-29 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-08-29 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-08-29 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-08-29 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-08-29 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-08-29 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-08-28 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-08-28 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-08-28 | LEHIGH CEMENT COMPANY | LEEDS, Jefferson, AL | Pass | Local |
| 2025-08-28 | CIRCLE K TERMINAL ALABAMA LLC (OLD BAMA TERMINAL) | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2025-08-28 | SOUTHWESTERN ELECTIRC POWER COMPANY - HARRY D. MATTISON POWER PLANT | TONTITOWN, Washington, AR | Pass | State |
| 2025-08-28 | MARTIN MARIETTA MATERIAL, INC. - JONES MILL QUARRY | MALVERN, Hot Spring, AR | Pass | State |
| 2025-08-28 | MARTIN MARIETTA MATERIAL, INC. - JONES MILL QUARRY | MALVERN, Hot Spring, AR | Pass | State |
| 2025-08-28 | MARTIN MARIETTA MATERIAL, INC. - JONES MILL QUARRY | MALVERN, Hot Spring, AR | Pass | State |
| 2025-08-28 | MARTIN MARIETTA MATERIAL, INC. - JONES MILL QUARRY | MALVERN, Hot Spring, AR | Pass | State |
| 2025-08-28 | MARTIN MARIETTA MATERIAL, INC. - JONES MILL QUARRY | MALVERN, Hot Spring, AR | Pass | State |
| 2025-08-28 | MARTIN MARIETTA MATERIAL, INC. - JONES MILL QUARRY | MALVERN, Hot Spring, AR | Pass | State |
| 2025-08-28 | MARTIN MARIETTA MATERIAL, INC. - JONES MILL QUARRY | MALVERN, Hot Spring, AR | Pass | State |
| 2025-08-28 | MARTIN MARIETTA MATERIAL, INC. - JONES MILL QUARRY | MALVERN, Hot Spring, AR | Pass | State |
| 2025-08-28 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-08-28 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-08-28 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-08-28 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-08-28 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-08-28 | STANISLAUS FOOD PRODUCTS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-08-28 | STANISLAUS FOOD PRODUCTS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-08-28 | STANISLAUS FOOD PRODUCTS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-08-28 | STANISLAUS FOOD PRODUCTS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-08-28 | STANISLAUS FOOD PRODUCTS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-08-28 | STANISLAUS FOOD PRODUCTS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-08-28 | STANISLAUS FOOD PRODUCTS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-08-28 | STANISLAUS FOOD PRODUCTS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-08-28 | STANISLAUS FOOD PRODUCTS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-08-28 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Fail | Local |
| 2025-08-28 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Fail | Local |
| 2025-08-28 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-08-28 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Fail | Local |
| 2025-08-28 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Fail | Local |
| 2025-08-28 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-08-28 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Fail | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.