EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 15,218Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,887
- California 1,849
- Indiana 1,315
- New Mexico 1,112
- Florida 1,099
- Wyoming 903
- Georgia 693
- Pennsylvania 636
- Arkansas 481
- Alabama 445
- Missouri 433
- Texas 337
- Mississippi 332
- Michigan 270
- Colorado 255
- Iowa 250
- North Carolina 239
- Illinois 224
- Wisconsin 190
- South Carolina 165
- Kansas 151
- West Virginia 140
- Virginia 119
- Montana 115
- Idaho 114
- Utah 109
- Minnesota 108
- Delaware 107
- Tennessee 106
- Kentucky 97
- Connecticut 92
- Washington 87
- Arizona 83
- Massachusetts 78
- Nebraska 74
- North Dakota 72
- New York 67
- Nevada 61
- Alaska 47
- New Hampshire 38
- South Dakota 36
- Louisiana 35
- District of Columbia 30
- Maryland 29
- Oregon 28
- Hawaii 24
- Rhode Island 19
- Maine 16
- Oklahoma 15
- Puerto Rico 6
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-08-18 | THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS, Dallas, TX | Pass | State |
| 2026-08-18 | THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS, Dallas, TX | Pass | State |
| 2026-08-18 | THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS, Dallas, TX | Pass | State |
| 2026-08-18 | THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS, Dallas, TX | Pass | State |
| 2026-08-18 | HOWARD COMPRESSOR STATION | ATHENS, Ellis, TX | Pass | State |
| 2026-08-18 | EXXONMOBIL BEAUMONT REFINERY — high-priority violation on file | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-18 | EXXONMOBIL BEAUMONT REFINERY — high-priority violation on file | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-18 | EXXONMOBIL BEAUMONT REFINERY — high-priority violation on file | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-18 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-18 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-18 | BEAUMONT GAS TO GASOLINE PLANT — high-priority violation on file | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-18 | BEAUMONT GAS TO GASOLINE PLANT — high-priority violation on file | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-18 | CLEBURNE PLANT | CLEBURNE, Johnson, TX | Pass | State |
| 2026-08-18 | SILVER CREEK PROCESSING PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-08-18 | AIR FORCE PLANT 4 LOCKHEED MARTIN | FORT WORTH, Tarrant, TX | Pass | State |
| 2026-08-18 | AIR FORCE PLANT 4 LOCKHEED MARTIN | FORT WORTH, Tarrant, TX | Pass | State |
| 2026-08-18 | AIR FORCE PLANT 4 LOCKHEED MARTIN | FORT WORTH, Tarrant, TX | Pass | State |
| 2026-08-18 | BRIDGEPORT GAS PLANT | BRIDGEPORT, Wise, TX | Pass | State |
| 2026-08-18 | WAGGONER COMPRESSOR STATION | DECATUR, Wise, TX | Pass | State |
| 2026-08-18 | BRISTOL VIRGINIA INTEGRATED SOLID WASTE FACILITY — high-priority violation on file | BRISTOL, Bristol (city), VA | Pending | State |
| 2026-08-18 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2026-08-18 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2026-08-18 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-18 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-18 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-18 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-18 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-08-18 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-08-18 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-08-17 | KIMBERLY-CLARK CORPORATION - MAUMELLE | MAUMELLE, Pulaski, AR | Pass | State |
| 2026-08-17 | KIMBERLY-CLARK CORPORATION - MAUMELLE | MAUMELLE, Pulaski, AR | Pass | State |
| 2026-08-17 | DESOTO GATHEIRNG COMPANY, LLC - GRAVEL HILL CPF-2 | CLEVELAND (HISTORICAL), TOWNSHIP OF, Van Buren, AR | Pass | State |
| 2026-08-17 | DESOTO GATHERING COMPANY, LLC - SOUTHWEST GREER LAKE CPF-5 | CLINTON, Van Buren, AR | Pass | State |
| 2026-08-17 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | N/A | State |
| 2026-08-17 | KINDER MORGAN OLP C | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-17 | KINDER MORGAN OLP C | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-17 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-08-17 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-08-17 | CHALK POINT POWER, LLC | AQUASCO, Prince George's, MD | Pending | State |
| 2026-08-17 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-17 | DUNDEE & KOALA CTB 1 | LA HUERTA, Eddy, NM | Pass | State |
| 2026-08-17 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-08-17 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-08-17 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-08-17 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-08-17 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-08-17 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-08-17 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-08-17 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-17 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-17 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-17 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-17 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-17 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-17 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-17 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-15 | VIRGINIA ELECTRIC AND POWER COMPANY, MT. STORM | MT. STORM, Grant, WV | Pass | State |
| 2026-08-14 | COLASKA INC, DBA QAP / CMI SVM-2500 ASPHALT PLANT | ANCHORAGE, Anchorage Municipality, AK | Pass | State |
| 2026-08-14 | KELCO MONSANTO CO | SAN DIEGO, San Diego, CA | Pass | Local |
| 2026-08-14 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-08-14 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-08-14 | AMAZON DATA SERVICES INCORPORATED — high-priority violation on file | NEW CARLISLE, St. Joseph, IN | Pass | State |
| 2026-08-14 | INDIANA MUNICIPAL POWER AGENCY-WHITEWATER VALLEY GENERATING | RICHMOND, Wayne, IN | Pass | State |
| 2026-08-14 | INDIANA MUNICIPAL POWER AGENCY-WHITEWATER VALLEY GENERATING | RICHMOND, Wayne, IN | Pass | State |
| 2026-08-14 | INDIANA MUNICIPAL POWER AGENCY-WHITEWATER VALLEY GENERATING | RICHMOND, Wayne, IN | Pass | State |
| 2026-08-14 | RIETH RILEY CONSTRUCTION COMPANY OAQ PORTABLE | VALPARAISO, Porter, IN | Pass | State |
| 2026-08-14 | RIETH RILEY CONSTRUCTION COMPANY OAQ PORTABLE | VALPARAISO, Porter, IN | Pass | State |
| 2026-08-14 | RIETH RILEY CONSTRUCTION COMPANY OAQ PORTABLE | VALPARAISO, Porter, IN | Pass | State |
| 2026-08-14 | RIETH RILEY CONSTRUCTION COMPANY OAQ PORTABLE | VALPARAISO, Porter, IN | Pass | State |
| 2026-08-14 | WOLVERINE POWER SUPPLY COOPERATIVE INC. - ALPINE POWER PLANT | ELMIRA, Otsego, MI | Pass | State |
| 2026-08-14 | FARMERS GRAIN TERMINAL INC., GREENVILLE | GREENVILLE, Washington, MS | Pass | State |
| 2026-08-14 | FARMERS GRAIN TERMINAL INC., GREENVILLE | GREENVILLE, Washington, MS | Pass | State |
| 2026-08-14 | WHOMPING WILLOW CTB AND COMPRESSOR BOOSTER STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-08-14 | WALTER COMPRESSOR STATION | LOCO HILLS, Lea, NM | Pass | State |
| 2026-08-14 | ART SMITH TB | MONUMENT, Lea, NM | Pass | State |
| 2026-08-14 | MILLWOOD, INC. - WAVERLY — high-priority violation on file | WAVERLY, Pike, OH | Pass | State |
| 2026-08-14 | INEOS US CHEMICALS COMPANY - COOPER RIVER PLANT — high-priority violation on file | WANDO, Berkeley, SC | Pending | State |
| 2026-08-14 | WONDER PORCELAIN GROUP, LLC — high-priority violation on file | LEBANON, Wilson, TN | Pending | State |
| 2026-08-14 | ROGERS GROUP, INC. | LAWRENCEBURG, Lawrence, TN | Pass | State |
| 2026-08-14 | EXXONMOBIL OIL BEAUMONT CHEMICAL PLANT — high-priority violation on file | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-14 | EXXONMOBIL OIL BEAUMONT CHEMICAL PLANT — high-priority violation on file | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-14 | BEAUMONT GAS TO GASOLINE PLANT — high-priority violation on file | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-14 | CHEVRON USA | UTAH, Undetermined, UT | Pass | State |
| 2026-08-14 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-08-14 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-08-14 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-08-14 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-08-14 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-08-14 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-08-13 | TR MILLER MILL CO INC | BREWTON, Escambia, AL | Pass | State |
| 2026-08-13 | TR MILLER MILL CO INC | BREWTON, Escambia, AL | Pass | State |
| 2026-08-13 | TR MILLER MILL CO INC | BREWTON, Escambia, AL | Pass | State |
| 2026-08-13 | KINDERMORGAN SOUTHEAST TERMINALS LLC | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-08-13 | BLACK HILLS ENERGY ARKANSAS, INC. - STOCKTON COMPRESSOR STATION | MULBERRY, Franklin, AR | Pass | State |
| 2026-08-13 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2026-08-13 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2026-08-13 | APS REDHAWK GENERATING FACILITY | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-08-13 | ARLINGTON VALLEY — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-08-13 | CEMEX LLC - BLACK MT. QUARRY | APPLE VALLEY, San Bernardino, CA | Pass | Local |
| 2026-08-13 | NOBLE ENERGY - LC22-A ECONODE T9N-R59W-S | RAYMER (NEW RAYMER) 10.7 MI. N, Weld, CO | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in 2026. It lists 11,110 stack tests recorded nationwide in 2026.