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 |
|---|---|---|---|---|
| 2026-02-03 | VALTO, INC. | JONESBORO, Craighead, AR | Pass | State |
| 2026-02-03 | ENTERGY ARKANSAS, LLC - INDEPENDENCE PLANT | NEWARK, Independence, AR | Pass | State |
| 2026-02-03 | TUCSON ELECTRIC POWER - SPRINGERVILLE GENERATING STATION | SPRINGERVILLE, Apache, AZ | Pass | State |
| 2026-02-03 | SFPP-PHOENIX TERMINAL | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2026-02-03 | CHEVRON POWER HOLDINGS, INC. FOR SALINAS RIVER COGENERATION FACILITY | SAN ARDO, Monterey, CA | Pass | Local |
| 2026-02-03 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-02-03 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-03 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-03 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-03 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-03 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | CA DEPT CORRECTIONS STATE PRISON — high-priority violation on file | CORCORAN, Kings, CA | Pass | Local |
| 2026-02-03 | FOSTER FOOD PRODUCTS — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-02-03 | MPLX TERMINALS LLC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-02-03 | PREFERRED MATERIALS, INC | NAPLES, Collier, FL | Pass | State |
| 2026-02-03 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Fail | State |
| 2026-02-03 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-02-03 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-02-03 | ELBA LIQUEFACTION COMPANY, LLC - ELBA LIQUEFACTION TERMINAL | SAVANNAH, Chatham, GA | Pass | State |
| 2026-02-03 | ELBA LIQUEFACTION COMPANY, LLC - ELBA LIQUEFACTION TERMINAL | SAVANNAH, Chatham, GA | Pass | State |
| 2026-02-03 | ELBA LIQUEFACTION COMPANY, LLC - ELBA LIQUEFACTION TERMINAL | SAVANNAH, Chatham, GA | Pass | State |
| 2026-02-03 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-02-03 | VAN DIEST SUPPLY CO | WEBSTER CITY, Hamilton, IA | Pass | State |
| 2026-02-03 | BRIGHAM YOUNG UNIVERSITY IDAHO — high-priority violation on file | REXBURG, Madison, ID | Pass | State |
| 2026-02-03 | TEXAS EASTERN TRANSMISSION LP — high-priority violation on file | JONESBORO, Grant, IN | Pass | State |
| 2026-02-03 | TEXAS EASTERN TRANSMISSION LP — high-priority violation on file | JONESBORO, Grant, IN | Pass | State |
| 2026-02-03 | TEXAS EASTERN TRANSMISSION LP — high-priority violation on file | JONESBORO, Grant, IN | Pass | State |
| 2026-02-03 | TEXAS EASTERN TRANSMISSION LP — high-priority violation on file | JONESBORO, Grant, IN | Pass | State |
| 2026-02-03 | SCOUT ENERGY - ULYSSES SUBLETTE MAIN STATION (AIR) | SUBLETTE, Haskell, KS | Pass | State |
| 2026-02-03 | SOUTHERN STAR CENTRAL GAS PIPELINE - ELK CITY DEHY BOOSTER STATION (AIR) | ELK CITY, Montgomery, KS | Pass | State |
| 2026-02-03 | SOUTHERN STAR CENTRAL GAS PIPELINE - ELK CITY DEHY BOOSTER STATION (AIR) | ELK CITY, Montgomery, KS | Pass | State |
| 2026-02-03 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-02-03 | TAMPA PORT SERVICES LLC - FAUSTINA PLANT | ST. JAMES, St. James, LA | Pass | State |
| 2026-02-03 | TENNESSEE GAS PIPELINE STATION 261 | AGAWAM, Hampden, MA | Pending | State |
| 2026-02-03 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-03 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-03 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-03 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-03 | BIRDIE COMPRESSOR STATION | ATOKA, Eddy, NM | Pass | State |
| 2026-02-03 | BIRDIE COMPRESSOR STATION | ATOKA, Eddy, NM | Pass | State |
| 2026-02-03 | PORT JEFFERSON ENERGY CENTER | PORT JEFFERSON, Suffolk, NY | Pass | State |
| 2026-02-03 | EOG RESOURCES, INC. - KOVACH 3-15-6 PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-02-03 | EOG RESOURCES, INC. - KOVACH 3-15-6 PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-02-03 | EOG RESOURCES, INC. - KOVACH 3-15-6 PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-02-03 | FULTON COUNTY PROCESSING | DELTA, Fulton, OH | Pass | State |
| 2026-02-03 | PPG INDUSTRIES OHIO, INC. | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2026-02-03 | CITY OF AKRON STEAM GENERATING | AKRON, Summit, OH | Pass | State |
| 2026-02-03 | CITY OF AKRON STEAM GENERATING | AKRON, Summit, OH | Pass | State |
| 2026-02-03 | COLUMBIA GAS TRANS CORP/GETTYSBURG COMP STA | GETTYSBURG, Adams, PA | Pass | State |
| 2026-02-03 | EXPAND OPERATING LLC/MCGAVIN WELL PAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2026-02-03 | WILLIAMS, D. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2026-02-03 | RESONAC GRAPHITE AMERICA INC — high-priority violation on file | RIDGEVILLE, Dorchester, SC | Fail | State |
| 2026-02-03 | RESONAC GRAPHITE AMERICA INC — high-priority violation on file | RIDGEVILLE, Dorchester, SC | Pass | State |
| 2026-02-03 | HIGH PLAINS PROCESSING, LLC, A DELAWARE LIMITED LIABILITY | MITCHELL, Davison, SD | Pass | State |
| 2026-02-03 | PACIFICORP CURRANT CREEK POWER PLANT | MONA, Juab, UT | Pass | State |
| 2026-02-03 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2026-02-03 | XCEL ENERGY - FRENCH ISLAND GENERATING PLANT | LA CROSSE, La Crosse, WI | Pass | State |
| 2026-02-03 | EASTERN GAS TRANSMISSION AND STORAGE, INC., LIGHTBURN STATION | JANE LEW, Lewis, WV | Pass | State |
| 2026-02-03 | APPALACHIAN POWER CO. - MOUNTAINEER PLANT, NEW HAVEN | NEW HAVEN, Mason, WV | Pass | State |
| 2026-02-03 | MONONGAHELA POWER COMPANY, FORT MARTIN STATION | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2026-02-03 | MONONGAHELA POWER COMPANY, FORT MARTIN STATION | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-03 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-02 | TUCSON ELECTRIC POWER - SPRINGERVILLE GENERATING STATION | SPRINGERVILLE, Apache, AZ | Pass | State |
| 2026-02-02 | CHEVRON U.S.A. INC. | SAN ARDO, Monterey, CA | Pass | Local |
| 2026-02-02 | CHEVRON U.S.A. INC. | SAN ARDO, Monterey, CA | Pass | Local |
| 2026-02-02 | CHEVRON U.S.A. INC. | SAN ARDO, Monterey, CA | Pass | Local |
| 2026-02-02 | WASTE SOLUTION GROUP OF SAN BENITO, LLC | HOLLISTER, San Benito, CA | Pass | Local |
| 2026-02-02 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Fail | State |
| 2026-02-02 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-02-02 | GEORGIA-PACIFIC GYPSUM LLC - SAVANNAH PLANT | SAVANNAH, Chatham, GA | Pass | State |
| 2026-02-02 | GIW INDUSTRIES, INC. | GROVETOWN, Columbia, GA | Pass | State |
| 2026-02-02 | DOUGHERTY COUNTY FLEMING/GAISSERT ROAD MSW LANDFILL | ALBANY, Dougherty, GA | Pass | State |
| 2026-02-02 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-02-02 | KAISER ALUMINUM WARRICK LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-02-02 | KAISER ALUMINUM WARRICK LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-02-02 | K & W LANDFILL INC | ONTONAGON, Ontonagon, MI | Pass | State |
| 2026-02-02 | TELLUS OPERATING GROUP LLC, BAXTERVILLE COMPRESSOR STATION | LUMBERTON, Lamar, MS | Pass | State |
| 2026-02-02 | TELLUS OPERATING GROUP LLC, BAXTERVILLE COMPRESSOR STATION | LUMBERTON, Lamar, MS | Pass | State |
| 2026-02-02 | TELLUS OPERATING GROUP LLC, BAXTERVILLE COMPRESSOR STATION | LUMBERTON, Lamar, MS | Pass | State |
| 2026-02-02 | NORTH MOULTON FIELD | SHELBY, Toole, MT | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.