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 |
|---|---|---|---|---|
| 2026-08-11 | SENECA ENERGY LFGTE FACILITY | SENECA FALLS, Seneca, NY | Pass | State |
| 2026-08-11 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2026-08-11 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2026-08-11 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2026-08-11 | NACOGDOCHES GENERATING FACILITY | CUSHING, Nacogdoches, TX | Pass | State |
| 2026-08-11 | ARLANXEO ORANGE SITE | WEST ORANGE, Orange, TX | Pass | State |
| 2026-08-11 | COLUMBIA GAS TRANSMISSION CORPORATION GALA COMPRES | EAGLE ROCK, Botetourt, VA | Pending | State |
| 2026-08-11 | HOPEWELL WATER RENEWAL | HOPEWELL, Hopewell (city), VA | Pending | State |
| 2026-08-10 | DESOTO GATHERING COMPANY, LLC - WEST CUTTHROAT CPF-1 | QUITMAN, Cleburne, AR | Pass | State |
| 2026-08-10 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW | CENTER RIDGE, Conway, AR | Pass | State |
| 2026-08-10 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-10 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-10 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-10 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-10 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-10 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-10 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-10 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-07 | APS WEST PHX POWER PLANT | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-08-07 | CONSUMERS ENERGY - RAY COMPRESSOR STATION | ARMADA, Macomb, MI | Pass | State |
| 2026-08-06 | DESOTO GATHERING COMPANY, LLC. - PUMA CPF-1 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-08-06 | DESOTO GATHERING COMPANY LLC - CHARLEY CPF-3 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-08-06 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2026-08-06 | CONSUMERS ENERGY - RAY COMPRESSOR STATION | ARMADA, Macomb, MI | Pass | State |
| 2026-08-06 | HOLLAND BPW, 48TH STREET PEAKING STATION | HOLLAND, Allegan, MI | Pass | State |
| 2026-08-06 | NCEMC - BUXTON | BUXTON, Dare, NC | Pending | State |
| 2026-08-06 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-08-06 | EQT MIDSTREAM COMPANY LLC/DEEMSTON WICKS COMP STA | FREDERICKTOWN, Washington, PA | Pass | State |
| 2026-08-06 | TENNESSEE VALLEY AUTHORITY - GALLATIN FOSSIL PLANT | GALLATIN, Sumner, TN | Pending | State |
| 2026-08-05 | SCOTTSBORO ELECTRIC POWER BOARD | SCOTTSBORO, Jackson, AL | Pass | State |
| 2026-08-05 | DESOTO GATHERING COMPANY, LLC - HAMMERHEAD CPF-1 | JUDSONIA, White, AR | Pass | State |
| 2026-08-05 | DESOTO GATHERING COMPANY, LLC - TIGER CPF-1 | BRADFORD, White, AR | Pass | State |
| 2026-08-05 | SACRAMENTO MUNICIPAL UTILITY DIST. FINANCING AUTHORITY DBA CAMPBELL POWER PLANT | SACRAMENTO, Sacramento, CA | Pending | Local |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-05 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-05 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-05 | WESTROCK KRAFT PAPER, LLC | ROANOKE RAPIDS, Halifax, NC | Pending | State |
| 2026-08-05 | TEXAS EASTERN TRANS LP/HOLBROOK STA | WIND RIDGE, Greene, PA | Pass | State |
| 2026-08-05 | ETC NORTHEAST FLD SVC LLC/PIKE COMP STA | ROCHESTER, Beaver, PA | Pass | State |
| 2026-08-05 | SYLVAMO NORTH AMERICA LLC - EASTOVER MILL | EASTOVER, Richland, SC | Pending | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | SILVER CREEK PROCESSING PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-08-05 | SILVER CREEK PROCESSING PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-08-04 | MPLX TERMINAL LLC | MONTGOMERY, Montgomery, AL | Pass | State |
| 2026-08-04 | RAZORBACK GATHERING COMPANY, LLC. - TWIN GROVES CPF 1 | GREENBRIER, Faulkner, AR | Pass | State |
| 2026-08-04 | RAZORBACK GATHERING COMPANY, LLC. - TWIN GROVES CPF 1 | GREENBRIER, Faulkner, AR | Pass | State |
| 2026-08-04 | JH RUDOLPH & COMPANY INCORPORATED PETERSBURG | DALE, Spencer, IN | Pass | State |
| 2026-08-04 | JH RUDOLPH & COMPANY INCORPORATED PETERSBURG | DALE, Spencer, IN | Pass | State |
| 2026-08-04 | JH RUDOLPH & COMPANY INCORPORATED PETERSBURG | DALE, Spencer, IN | Pass | State |
| 2026-08-04 | JH RUDOLPH & COMPANY INCORPORATED PETERSBURG | DALE, Spencer, IN | Pass | State |
| 2026-08-04 | LANSING BOARD OF WATER AND LIGHT - REO TOWN PLANT | LANSING, Ingham, MI | Pass | State |
| 2026-08-04 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-04 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Fail | State |
| 2026-08-04 | ALTA PERFORMANCE MATERIALS US, LLC | PITTSBURGH, Allegheny, PA | Pass | Local |
| 2026-08-04 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-08-04 | VALERO RENEWABLE FUELS COMPANY LLC — high-priority violation on file | AURORA, Brookings, SD | Pass | State |
| 2026-08-04 | 3M COMPANY | CLINTON, Anderson, TN | Pending | State |
| 2026-08-04 | EQT XL MIDSTREAM OPERATING LLC, CHANNING COMPRESSOR | PROCTOR, Marshall, WV | Pass | State |
| 2026-08-04 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-04 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-04 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-04 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-04 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-04 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-04 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-04 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-03 | DESOTO GATHERING COMPANY, LLC - YOGI CPF-1 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-08-03 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2026-08-03 | BRIDGEWATER POWER COMPANY, L.P. | BRIDGEWATER, Grafton, NH | Pending | State |
| 2026-08-03 | BRIDGEWATER POWER COMPANY, L.P. | BRIDGEWATER, Grafton, NH | Pending | State |
| 2026-08-03 | CONSOL PA COAL CO LLC/BAILEY PREP PLT — high-priority violation on file | WEST FINLEY, Greene, PA | Pass | State |
| 2026-08-03 | AMERESCO BIOGAS ENERGY FACILITY | DALLAS, Dallas, TX | Pass | State |
| 2026-08-03 | CHEVRON PHILLIPS CHEMICAL PORT ARTHUR FACILITY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-03 | CHEVRON PHILLIPS CHEMICAL PORT ARTHUR FACILITY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-03 | BASF TOTAL FINA NAFTA REGION OLEFINS COMPLEX — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-03 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-08-03 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-08-03 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-08-03 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-08-03 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-03 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-03 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-03 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-31 | RAZORBACK GATHERING COMPANY, LLC. - LITTLE RED RIVER CPF 1 | BALD KNOB, White, AR | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.