EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 11,110Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,474
- Indiana 1,010
- California 979
- Florida 795
- Wyoming 755
- New Mexico 724
- Georgia 509
- Pennsylvania 501
- Arkansas 374
- Alabama 357
- Missouri 326
- Texas 316
- Mississippi 263
- Michigan 207
- North Carolina 188
- Colorado 185
- Iowa 167
- Illinois 165
- South Carolina 135
- Wisconsin 135
- West Virginia 114
- Virginia 98
- Idaho 96
- Montana 91
- Tennessee 84
- Minnesota 84
- Delaware 73
- Kentucky 71
- Arizona 71
- Connecticut 68
- Kansas 63
- Nevada 57
- Massachusetts 54
- North Dakota 52
- Nebraska 51
- Utah 51
- Washington 46
- Alaska 45
- New York 43
- South Dakota 34
- District of Columbia 30
- New Hampshire 29
- Maryland 28
- Oregon 27
- Louisiana 26
- Hawaii 21
- Oklahoma 15
- Rhode Island 13
- Puerto Rico 5
- Maine 5
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-08-20 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-20 | SILVER CREEK PROCESSING PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-08-19 | DESOTO GATHERING COMPANY, LLC - PHILLIPS MOUNTAIN CPF-2 | CLEVELAND, Conway, AR | Pass | State |
| 2026-08-19 | DESOTO GATHERING COMPANY LLC - PIKE CPF-1 | HATTIEVILLE, Conway, AR | Pass | State |
| 2026-08-19 | HENRY PRODUCTS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-08-19 | YALE UNIVERSITY / CENTRAL POWER PLANT | NEW HAVEN, New Haven, CT | Pending | State |
| 2026-08-19 | TOYOTA BATTERY MFG. INC. DBA TOYOTA BATTERY MANUFACTURING NC | LIBERTY, Randolph, NC | Pending | State |
| 2026-08-19 | SAWYERS PAD 952878 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | SAWYERS PAD 952878 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | SAWYERS PAD 952878 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-08-19 | US DOD/RAVEN ROCK MTN COMPLEX | BLUE RIDGE SUMMIT, Adams, PA | Pass | State |
| 2026-08-19 | WATEREE STATION | EASTOVER, Richland, SC | Pass | State |
| 2026-08-19 | REEVES CONSTRUCTION COMPANY - BLACKSBURG ASPHALT PLANT | BLACKSBURG, Cherokee, SC | Pass | State |
| 2026-08-19 | HANKOOK & COMPANY ES AMERICA CORP. — high-priority violation on file | CLARKSVILLE, Montgomery, TN | Pending | State |
| 2026-08-19 | TENNESSEE VALLEY AUTHORITY (TVA) - KINGSTON FOSSIL PLANT — high-priority violation on file | HARRIMAN, Roane, TN | Pending | State |
| 2026-08-19 | DOMINION ENERGY â FORT BELVOIR PRIVATIZATION | FORT BELVOIR, Fairfax, VA | Pending | State |
| 2026-08-19 | DOMINION ENERGY - VIRGINIA CITY HYBRID ENERGY CENTER | ST PAUL, Wise, VA | Pending | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-18 | CAPITAL MATERIALS-PROSIZER (PORT-0836) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-18 | CAPITAL MATERIALS-PROSIZER (PORT-0836) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-18 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pending | State |
| 2026-08-18 | GEORGIA-PACIFIC GYPSUM LLC | NEWINGTON, Rockingham, NH | Pending | State |
| 2026-08-18 | TENNESSEE GAS PIPELINE CO - COMP STA 241 | LAFAYETTE, Onondaga, NY | Pass | State |
| 2026-08-18 | AMGEN MANUFACTURING, INC. | JUNCOS, Juncos, PR | Pass | U.S. EPA |
| 2026-08-18 | PANAGAKOS ASPHALT PAVING GREENVILLE | GREENVILLE, Greenville, SC | 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 | 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 | 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 |
| 2026-08-17 | 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 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | 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 |
| 2026-08-14 | 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 |
| 2026-08-13 | 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 | COVERT GENERATING STATION — high-priority violation on file | COVERT, Van Buren, MI | Pass | State |
| 2026-08-13 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-13 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-08-13 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-08-13 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-08-13 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pending | State |
| 2026-08-13 | HERSHEY CO/WWTP | HERSHEY, Dauphin, PA | Pass | State |
| 2026-08-13 | C R JACKSON INC - SUMTER ASPHALT PLANT | SUMTER, Sumter, SC | Pass | State |
| 2026-08-12 | DESOTO GATHERING COMPANY, LLC - TIGER CPF-1 | BRADFORD, White, AR | Pass | State |
| 2026-08-12 | DESOTO GATHERING COMPANY, LLC - TIGER CPF-1 | BRADFORD, White, AR | Pass | State |
| 2026-08-12 | SABETHA MUN. POWER PLANT (AIR) | SABETHA, Nemaha, KS | Pass | State |
| 2026-08-12 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pending | State |
| 2026-08-12 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pending | State |
| 2026-08-12 | MAYMEAD, INC. - MT AIRY PLANT — high-priority violation on file | MOUNT AIRY, Surry, NC | Pending | State |
| 2026-08-11 | CITGO PETROLEUM CORP. | BIRMINGHAM, Jefferson, AL | Pending | Local |
| 2026-08-11 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-3 | SPRINGFIELD, Conway, AR | Pass | State |
| 2026-08-11 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-3 | SPRINGFIELD, Conway, AR | Pass | State |
| 2026-08-11 | BONANZA CREEK ENERGY - ANTELOPE SECTION | KERSEY 9.2 MI. E OF, Weld, CO | Pass | State |
| 2026-08-11 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-11 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pending | State |
| 2026-08-11 | GREDE II - BISCOE, LLC — high-priority violation on file | BISCOE, Montgomery, NC | Pending | State |
| 2026-08-11 | CAROLINA POULTRY POWER RG1, LLC | FARMVILLE, Pitt, NC | Pending | State |
| 2026-08-11 | GEORGIA-PACIFIC WOOD PRODUCTS LLC - DUDLEY PLYWOOD/CNS | DUDLEY, Wayne, NC | Pending | State |
| 2026-08-11 | TGP COMPRESSOR STATION 245 | WINFIELD, Herkimer, NY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.