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 |
|---|---|---|---|---|
| 2026-02-17 | ONEOK GAS TRANSPORTATION LLC / SALT CREEK COMPRESSOR STATION | DEPEW, Creek, OK | Pass | State |
| 2026-02-17 | CHESTNUT VALLEY LDFL LLC/GERMAN TWP — high-priority violation on file | MC CLELLANDTOWN, Fayette, PA | Pass | State |
| 2026-02-17 | NFG MIDSTREAM COVINGTON LLC/COVINGTON COMP STA | COVINGTON, Tioga, PA | Pass | State |
| 2026-02-17 | COMMANDER NAVY REGION MIDATLANTIC/HOST S | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2026-02-17 | COMMANDER NAVY REGION MIDATLANTIC/HOST S | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2026-02-17 | WOONSOCKET WASTEWATER TREATMENT FACILITY | WOONSOCKET, Providence, RI | Pass | State |
| 2026-02-17 | WILLOW LAKE COMPRESSOR STATION | WILLOW LAKE, Clark, SD | Pass | State |
| 2026-02-17 | PETE LIEN & SONS, INC. MAIN PLANT | RAPID CITY, Pennington, SD | Pass | State |
| 2026-02-17 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-17 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-17 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-17 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-17 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-17 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-17 | REWORLD FAIRFAX, LLC | LORTON, Fairfax, VA | Pass | State |
| 2026-02-17 | AMAZON DATA SERVICES INC. IAD450-456 COSNER TECH CAMPUS — high-priority violation on file | FREDERICKSBURG, Spotsylvania, VA | Pass | State |
| 2026-02-17 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-17 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-17 | STEELSCAPE, LC | WASHINGTON, Undetermined, WA | Pass | Local |
| 2026-02-17 | BADGER MINING CORP-TAYLOR PLANT | TAYLOR, Jackson, WI | Pass | State |
| 2026-02-17 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2026-02-17 | KENTUCKY POWER COMPANY, MITCHELL PLANT | MOUNDSVILLE, Marshall, WV | Pass | State |
| 2026-02-17 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-02-17 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-02-17 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-02-17 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-02-17 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-02-17 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-02-16 | DESOTO GATHERING COMPANY, LLC - GRIFFIN MOUNTAIN CPF-2 | JERUSALEM, Conway, AR | Pass | State |
| 2026-02-16 | DESOTO GATHERING COMPANY, LLC - STURGEON CPF-3 | CENTER RIDGE, Conway, AR | Pass | State |
| 2026-02-16 | FLORIDA POWER & LIGHT (PMR) | INDIANTOWN, Martin, FL | Pass | State |
| 2026-02-16 | FLORIDA POWER & LIGHT (PMR) | INDIANTOWN, Martin, FL | Pass | State |
| 2026-02-16 | KAUAI ISLAND UTILITY - PORT ALLEN — high-priority violation on file | ELEELE, Kauai, HI | Pass | State |
| 2026-02-16 | KAUAI ISLAND UTILITY - PORT ALLEN — high-priority violation on file | ELEELE, Kauai, HI | Pass | State |
| 2026-02-16 | NORTH AMERICAN -- CENTRAL, LLC - CENTRAL GENERATING STATION | PIERSON, Montcalm, MI | Pass | State |
| 2026-02-16 | THOMAS HILL ENERGY CENTER - POWER DIVISION | CLIFTON HILL, Randolph, MO | Pass | State |
| 2026-02-16 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-16 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-16 | RAMBO BOOSTER STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-02-16 | RAMBO BOOSTER STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-02-16 | B BANKER FACILITY | LOVING, Eddy, NM | Pass | State |
| 2026-02-16 | GENERAL KEHOE FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-02-16 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-16 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-16 | OXY - RED TANK 19 CGL | EUNICE, Lea, NM | Pass | State |
| 2026-02-16 | OXY - RED TANK 19 CGL | EUNICE, Lea, NM | Pass | State |
| 2026-02-16 | RODNEY ROBINSON NORTH FACILITY | EUNICE, Lea, NM | Pass | State |
| 2026-02-16 | RODNEY ROBINSON NORTH FACILITY | EUNICE, Lea, NM | Pass | State |
| 2026-02-16 | RODNEY ROBINSON SOUTH TB | MALAGA, Lea, NM | Pass | State |
| 2026-02-16 | MIAMI UNIVERSITY | OXFORD, Butler, OH | Pass | State |
| 2026-02-16 | GEORGIA-PACIFIC TOLEDO LLC — high-priority violation on file | TOLEDO, Lincoln, OR | N/A | State |
| 2026-02-16 | TRANSCONTINENTAL GAS/SALLADASBURG STATION 520 | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2026-02-16 | DIVERSIFIED PROD CO LLC/STATE GAME LANDS COMP STA | MANONING TOWNSHIP, Armstrong, PA | Pass | State |
| 2026-02-16 | DIVERSIFIED PROD LLC/PINE CREEK COMP STA | PINE CREEK TOWNSHIP, Jefferson, PA | Pass | State |
| 2026-02-16 | MITSUBISHI CHEMICAL AMERICA (FORMERLY LUCITE INC.) | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-16 | MOUNTAIN STATE CLEAN ENERGY, LLC, MAIDSVILLE | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2026-02-16 | DRY FORK STATION (BASIN ELECTRIC POWER COOP) | GILLETTE, Campbell, WY | Pass | State |
| 2026-02-16 | DRY FORK STATION (BASIN ELECTRIC POWER COOP) | GILLETTE, Campbell, WY | Pass | State |
| 2026-02-16 | DRY FORK STATION (BASIN ELECTRIC POWER COOP) | GILLETTE, Campbell, WY | Pass | State |
| 2026-02-16 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-02-16 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-02-16 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-02-14 | GORGON LGL STATION | MALAGA, Lea, NM | Pass | State |
| 2026-02-14 | GATO GRANDE 16 CTB 1 | MALAGA, Lea, NM | Pass | State |
| 2026-02-13 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2026-02-13 | DESOTO GATHERING COMPANY LLC - CHARLEY CPF-3 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-02-13 | DESOTO GATHERING COMPANY, LLC - MAKO CPF-1 | PANGBURN, White, AR | Pass | State |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-13 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-13 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-13 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-13 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-13 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-13 | ROBINS AIR FORCE BASE | WARNER ROBINS, Houston, GA | Pass | State |
| 2026-02-13 | MIDWEST AEROSPACE LLC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-02-13 | TEXAS GAS TRANSMISSION LLC, LAKE CORMORANT COMPRESSOR STATION | LAKE CORMORA, DeSoto, MS | Pass | State |
| 2026-02-13 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-02-13 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-02-13 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-02-13 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-02-13 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.