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 |
|---|---|---|---|---|
| 2026-01-12 | VALERO CORPUS CHRISTI REFINERY EAST PLANT | CORPUS CHRISTI, Nueces, TX | Pass | State |
| 2026-01-12 | VALERO CORPUS CHRISTI REFINERY EAST PLANT | CORPUS CHRISTI, Nueces, TX | Pass | State |
| 2026-01-12 | VALERO CORPUS CHRISTI REFINERY EAST PLANT | CORPUS CHRISTI, Nueces, TX | Pass | State |
| 2026-01-12 | VALERO CORPUS CHRISTI REFINERY WEST PLANT — high-priority violation on file | CORPUS CHRISTI, Nueces, TX | Pass | State |
| 2026-01-12 | US NAVY - NORFOLK NAVAL SHIPYARD | PORTSMOUTH, Portsmouth (city), VA | Pass | State |
| 2026-01-10 | PLINY THE ELDER COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-01-09 | POWERSOUTH ENERGY COOPERATIVE INC | MCINTOSH, Washington, AL | Pass | State |
| 2026-01-09 | POWERSOUTH ENERGY COOPERATIVE INC | MCINTOSH, Washington, AL | Pass | State |
| 2026-01-09 | GALLAUDET UNIVERSITY — high-priority violation on file | WASHINGTON, District of Columbia, DC | Pass | State |
| 2026-01-09 | LAKELAND ELECTRIC | LAKELAND, Polk, FL | Pass | State |
| 2026-01-09 | WRB REFINING LP WOOD RIVER REFINERY — high-priority violation on file | ROXANA, Madison, IL | Pass | State |
| 2026-01-09 | EVERGY, INC. - JEFFREY ENERGY CENTER (AIR) | ST. MARY'S, Pottawatomie, KS | Pass | State |
| 2026-01-09 | ROBESON COUNTY LANDFILL | SAINT PAULS, Robeson, NC | Pending | State |
| 2026-01-09 | LONGWOOD - STATELINE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-09 | RANGER NORTH COMPRESSOR STATION | HOBBS, Lea, NM | Pass | State |
| 2026-01-09 | BOLEN PAD 952350 | SARDIS, Monroe, OH | Pass | State |
| 2026-01-09 | BOLEN PAD 952350 | SARDIS, Monroe, OH | Pass | State |
| 2026-01-09 | BOLEN PAD 952350 | SARDIS, Monroe, OH | Pass | State |
| 2026-01-09 | RAD MFG LLC/NESCOPECK | NESCOPECK, Luzerne, PA | Pass | State |
| 2026-01-09 | GREYLOCK PROD LLC/WILDCAT WELL PAD | MT MORRIS, Greene, PA | Pass | State |
| 2026-01-09 | HAMPTON ROADS BRIDGE TUNNEL I-64 EXPANSION - SOUTH ISLAND | HAMPTON, Hampton (city), VA | Pass | State |
| 2026-01-08 | SOUTHERN NATURAL GAS | AUBURN, Lee, AL | Pass | State |
| 2026-01-08 | SOUTHERN NATURAL GAS | AUBURN, Lee, AL | Pass | State |
| 2026-01-08 | GROOMS ALUMINUM PROCESSING — high-priority violation on file | ASHVILLE, St. Clair, AL | Pass | State |
| 2026-01-08 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-5 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-01-08 | ENABLE GAS TRANSMISSION, LLC - PINEY COMPRESSOR STATION | LONDON, Pope, AR | Pass | State |
| 2026-01-08 | ENABLE GAS TRANSMISSION, LLC - PINEY COMPRESSOR STATION | LONDON, Pope, AR | Pass | State |
| 2026-01-08 | ENABLE GAS TRANSMISSION, LLC - PINEY COMPRESSOR STATION | LONDON, Pope, AR | Pass | State |
| 2026-01-08 | DESOTO GATHERING COMPANY, LLC - STEELHEAD CPF-3 | CLINTON, Van Buren, AR | Pass | State |
| 2026-01-08 | HIGH DESERT POWER PROJECT, LLC | VICTORVILLE, San Bernardino, CA | Pass | Local |
| 2026-01-08 | HIGH DESERT POWER PROJECT, LLC | VICTORVILLE, San Bernardino, CA | Pass | Local |
| 2026-01-08 | HIGH DESERT POWER PROJECT, LLC | VICTORVILLE, San Bernardino, CA | Pass | Local |
| 2026-01-08 | SO CAL EDISON CO | AVALON, Los Angeles, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | GALLAUDET UNIVERSITY — high-priority violation on file | WASHINGTON, District of Columbia, DC | Incomplete | State |
| 2026-01-08 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-01-08 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-01-08 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-01-08 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-01-08 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-01-08 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-01-08 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-01-08 | TYSON POULTRY, INC. RIVER VALLEY INGREDIENTS CUMMING DIVISION | CUMMING, Forsyth, GA | Pass | State |
| 2026-01-08 | LX HAUSYS AMERICA, INC. — high-priority violation on file | ADAIRSVILLE, Gordon, GA | Pass | State |
| 2026-01-08 | LX HAUSYS AMERICA, INC. — high-priority violation on file | ADAIRSVILLE, Gordon, GA | Pass | State |
| 2026-01-08 | HEALTHY PET — high-priority violation on file | JESUP, Wayne, GA | Pass | State |
| 2026-01-08 | HEALTHY PET — high-priority violation on file | JESUP, Wayne, GA | Pass | State |
| 2026-01-08 | HEALTHY PET — high-priority violation on file | JESUP, Wayne, GA | Pass | State |
| 2026-01-08 | HEALTHY PET — high-priority violation on file | JESUP, Wayne, GA | Pass | State |
| 2026-01-08 | HEALTHY PET — high-priority violation on file | JESUP, Wayne, GA | Pass | State |
| 2026-01-08 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-01-08 | ADM CLINTON BIOPROCESSING - CLINTON — high-priority violation on file | CLINTON, Clinton, IA | Pass | State |
| 2026-01-08 | ROCKIES EXPRESS PIPELINE LLC - ST PAUL COMPRESSOR STATION | SAINT PAUL, Decatur, IN | Pass | State |
| 2026-01-08 | ROCKIES EXPRESS PIPELINE LLC - ST PAUL COMPRESSOR STATION | SAINT PAUL, Decatur, IN | Pass | State |
| 2026-01-08 | ROCKIES EXPRESS PIPELINE LLC - ST PAUL COMPRESSOR STATION | SAINT PAUL, Decatur, IN | Pass | State |
| 2026-01-08 | NORTHEASTERN REMC — high-priority violation on file | COLUMBIA CITY, Whitley, IN | Pass | State |
| 2026-01-08 | NORTHEASTERN REMC — high-priority violation on file | COLUMBIA CITY, Whitley, IN | Pass | State |
| 2026-01-08 | NORTHEASTERN REMC — high-priority violation on file | COLUMBIA CITY, Whitley, IN | Pass | State |
| 2026-01-08 | NORTHEASTERN REMC — high-priority violation on file | COLUMBIA CITY, Whitley, IN | Pass | State |
| 2026-01-08 | NORTHEASTERN REMC — high-priority violation on file | COLUMBIA CITY, Whitley, IN | Pass | State |
| 2026-01-08 | NORTHEASTERN REMC — high-priority violation on file | COLUMBIA CITY, Whitley, IN | Pass | State |
| 2026-01-08 | CF INDUSTRIES NITROGEN LLC - DONALDSONVILLE NITROGEN COMPLEX | DONALDSONVILLE, Ascension, LA | Pass | State |
| 2026-01-08 | CF INDUSTRIES NITROGEN LLC - DONALDSONVILLE NITROGEN COMPLEX | DONALDSONVILLE, Ascension, LA | Pass | State |
| 2026-01-08 | CONSUMERS ENERGY - MUSKEGON RIVER COMPRESSOR STATION | MARION, Clare, MI | Pass | State |
| 2026-01-08 | AMERICAN CRYSTAL SUGAR - MOORHEAD — high-priority violation on file | MOORHEAD, Clay, MN | Pass | State |
| 2026-01-08 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-01-08 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-01-08 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-01-08 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-01-08 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pending | State |
| 2026-01-08 | CITY OF GREENSBORO - T.Z. OSBORNE WATER RECLAMATION FACILITY — high-priority violation on file | MCLEANSVILLE, Guilford, NC | Fail | State |
| 2026-01-08 | WEST TURKEY TRACK BOOSTER — high-priority violation on file | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-01-08 | SECTION 9 COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.