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 |
|---|---|---|---|---|
| 2026-08-11 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-08-11 | MID-GEORGIA COGEN LP | KATHLEEN, Houston, GA | Pass | State |
| 2026-08-11 | MID-GEORGIA COGEN LP | KATHLEEN, Houston, GA | Pass | State |
| 2026-08-11 | J R SIMPLOT COMPANY-DON SIDING POCATELLO — high-priority violation on file | POCATELLO, Power, ID | Pending | State |
| 2026-08-11 | COVIA SOLUTIONS INC | OREGON, Ogle, IL | Pass | State |
| 2026-08-11 | COVIA SOLUTIONS INC | OREGON, Ogle, IL | Pass | State |
| 2026-08-11 | MARQUIS CONCRETE & STONE LLC | HENNEPIN, Putnam, IL | Pass | State |
| 2026-08-11 | MARQUIS CONCRETE & STONE LLC | HENNEPIN, Putnam, IL | Pass | State |
| 2026-08-11 | MARQUIS CONCRETE & STONE LLC | HENNEPIN, Putnam, IL | Pass | State |
| 2026-08-11 | MARQUIS CONCRETE & STONE LLC | HENNEPIN, Putnam, IL | Pass | State |
| 2026-08-11 | MARQUIS CONCRETE & STONE LLC | HENNEPIN, Putnam, IL | Pass | State |
| 2026-08-11 | MARQUIS CONCRETE & STONE LLC | HENNEPIN, Putnam, IL | Pass | State |
| 2026-08-11 | MARQUIS CONCRETE & STONE LLC | HENNEPIN, Putnam, IL | Pass | State |
| 2026-08-11 | MARQUIS CONCRETE & STONE LLC | HENNEPIN, Putnam, IL | Pass | State |
| 2026-08-11 | MARQUIS CONCRETE & STONE LLC | HENNEPIN, Putnam, IL | Pass | State |
| 2026-08-11 | SCOT INDUSTRIES INC | AUBURN, DeKalb, IN | Pass | State |
| 2026-08-11 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-08-11 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-08-11 | JUPITER ALUMINUM CORPORATION FAIRLAND COIL COATING | FAIRLAND, Shelby, IN | Pass | State |
| 2026-08-11 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-08-11 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-08-11 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-08-11 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-08-11 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-08-11 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | 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 | Pass | State |
| 2026-08-11 | GEORGIA-PACIFIC WOOD PRODUCTS LLC - DUDLEY PLYWOOD/CNS | DUDLEY, Wayne, NC | Pending | State |
| 2026-08-11 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-11 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-11 | COVANTA HUNTINGTON LLC | E NORTHPORT, Suffolk, NY | Pass | State |
| 2026-08-11 | TGP COMPRESSOR STATION 245 | WINFIELD, Herkimer, NY | Pass | State |
| 2026-08-11 | SENECA ENERGY LFGTE FACILITY | SENECA FALLS, Seneca, NY | Pass | State |
| 2026-08-11 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-08-11 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-08-11 | EQM OLYMPUS - TITAN COMPRESSOR STATION | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-08-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, 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 | ASCENT RESOURCES - UTICA LLC - FAUNA WEL JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2026-08-11 | WESTERLY WASTEWATER TREATMENT PLANT | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2026-08-11 | WESTERLY WASTEWATER TREATMENT PLANT | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2026-08-11 | ENTERPRISE REFINED PRODUCTS COMPANY LLC | LEBANON, Warren, OH | Pass | State |
| 2026-08-11 | EASTERN GAS TRANS & STORAGE INC/JB TONKIN STA | MURRYSVILLE, Westmoreland, PA | Pass | State |
| 2026-08-11 | CNX MIDSTREAM OPR CO LLC/MOR-44 COMP STA | WEST FINLEY, Washington, PA | Pass | State |
| 2026-08-11 | HOUSENICK, J. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-08-11 | WARRINER, R. PAD 2 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-08-11 | RHODE ISLAND LFG GENCO LLC — high-priority violation on file | JOHNSTON, TOWN OF, Providence, RI | 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 | Pass | State |
| 2026-08-11 | HOPEWELL WATER RENEWAL | HOPEWELL, Hopewell (city), VA | Pass | State |
| 2026-08-11 | PUGET SOUND ENERGY - ENCOGEN | BELLINGHAM, Whatcom, WA | Pass | Local |
| 2026-08-11 | XCEL ENERGY BAY FRONT GENERATING STATION | ASHLAND, Ashland, WI | Pass | State |
| 2026-08-11 | WI PUBLIC SERVICE CORP - JP PULLIAM PLANT | GREEN BAY, Brown, WI | Pass | State |
| 2026-08-11 | NORTHERN STATES PWR CO WHEATON GEN STA | EAU CLAIRE, Chippewa, WI | Pass | State |
| 2026-08-11 | AMRIZE BUILDING ENVELOPE LLC | DEFOREST, Dane, WI | Pass | State |
| 2026-08-10 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 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 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-08-10 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-08-10 | TROJAN HORSE COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-08-10 | CAVERN COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-08-10 | EUNICE GAS PROCESSING PLANT — high-priority violation on file | EUNICE, Lea, NM | Pass | State |
| 2026-08-10 | EUNICE GAS PROCESSING PLANT — high-priority violation on file | EUNICE, Lea, NM | Pass | State |
| 2026-08-10 | UNITED REFINING CO/WARREN PLT | WARREN, Warren, PA | Pass | State |
| 2026-08-10 | CNX MIDSTREAM OPR CO LLC/NV-57 COMP STA | PROSPERITY, Washington, PA | Pass | State |
| 2026-08-10 | WESTROCK CP LLC - WEST POINT | WEST POINT, King William, VA | Pass | State |
| 2026-08-10 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | 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 |
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.