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.
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.