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 |
|---|---|---|---|---|
| 2026-06-11 | BREITBURN OPERATING LP — high-priority violation on file | OCHOPEE, Collier, FL | Pass | State |
| 2026-06-11 | BOISE CASCADE WOOD PRODUCTS, LLC | HAVANA, Gadsden, FL | Pass | State |
| 2026-06-11 | BOISE CASCADE WOOD PRODUCTS, LLC | HAVANA, Gadsden, FL | Pass | State |
| 2026-06-11 | BOISE CASCADE WOOD PRODUCTS, LLC | HAVANA, Gadsden, FL | Pass | State |
| 2026-06-11 | BOISE CASCADE WOOD PRODUCTS, LLC | HAVANA, Gadsden, FL | Pass | State |
| 2026-06-11 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-11 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-11 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-11 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-11 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-11 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-11 | SEMINOLE ELECTRIC COOPERATIVE, INC. | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-11 | UNITED STATES SUGAR SAVANNAH REFINERY — high-priority violation on file | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2026-06-11 | UNITED STATES SUGAR SAVANNAH REFINERY — high-priority violation on file | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2026-06-11 | CHEMTALL INCORPORATED/FLOCRYL LLC - RICEBORO — high-priority violation on file | RICEBORO, Liberty, GA | Pass | State |
| 2026-06-11 | THOMAS A. SMITH ENERGY FACILITY | DALTON, Murray, GA | Pass | State |
| 2026-06-11 | THOMAS A. SMITH ENERGY FACILITY | DALTON, Murray, GA | Pass | State |
| 2026-06-11 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-11 | MIDAMERICAN ENERGY COMPANY SYCAMORE CTS | JOHNSTON, Polk, IA | Pass | Local |
| 2026-06-11 | CITGO PETROLEUM CORP — high-priority violation on file | LEMONT, Will, IL | Pending | State |
| 2026-06-11 | CITGO PETROLEUM CORP — high-priority violation on file | LEMONT, Will, IL | Pending | State |
| 2026-06-11 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-06-11 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-06-11 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-06-11 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-06-11 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-11 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-11 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-11 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-11 | MONARCH CEMENT (AIR) | HUMBOLDT, Allen, KS | Pass | State |
| 2026-06-11 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-06-11 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2026-06-11 | MARATHON SAINT PAUL PARK REFINERY | SAINT PAUL PARK, Washington, MN | Pass | State |
| 2026-06-11 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Fail | State |
| 2026-06-11 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Fail | State |
| 2026-06-11 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Fail | State |
| 2026-06-11 | DRY CREEK FIELD STATION 056 | RED LODGE, Carbon, MT | Pass | State |
| 2026-06-11 | KINDER MORGAN SE TERMINALS-CHAR #1 & #2 | PAW CREEK, Mecklenburg, NC | Pass | Local |
| 2026-06-11 | SCRUBGRASS GENERATING PLT/VENANGO — high-priority violation on file | KENNERDELL, Venango, PA | Pass | State |
| 2026-06-11 | EASTERN GAS TRANS & STORAGE INC/GREENLICK STA | STEWARDSON TWP, Potter, PA | Pass | State |
| 2026-06-11 | BUCK CO LLC/QUARRYVILLE — high-priority violation on file | QUARRYVILLE, Lancaster, PA | Pass | State |
| 2026-06-11 | PANTHER CREEK POWER OPR LLC/NESQUEHONING | NESQUEHONING, Carbon, PA | Pass | State |
| 2026-06-11 | DIVERSIFIED PROD LLC/HOMER CITY COMP STA | INDIANA, Indiana, PA | Pass | State |
| 2026-06-11 | LAUREL MTN MIDSTREAM OPR LLC/DAVIS COMP STA | JEFFERSON, Greene, PA | Pass | State |
| 2026-06-11 | PA GEN ENERGY CO LLC/FISK HOLLOW PAD A | ROULETTE, Potter, PA | Pass | State |
| 2026-06-11 | MERIDIAN BRICK MINERAL WELLS EAST FACILITY | MINERAL WELLS, Parker, TX | Pass | State |
| 2026-06-11 | MERCURY MARINE - PLANTS 3,4,10,12,15,17, | FOND DU LAC, Fond du Lac, WI | Pass | State |
| 2026-06-11 | BIG SANDY PEAKER PLANT, LLC, NEAL | KENOVA, Wayne, WV | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-11 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-06-11 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-06-10 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2026-06-10 | DESOTO GATHERING COMPANY, LLC. - PUMA CPF-1 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-06-10 | DESOTO GATHERING COMPANY, LLC - SOUTHEAST RAINBOW CPF-2 | BEE BRANCH, Conway, AR | Pass | State |
| 2026-06-10 | DESERT CONSTRUCTION - PLANT #2 | KINGMAN, Mohave, AZ | Pass | State |
| 2026-06-10 | QB ENERGY - E28OU SWD FACILITY | DE BEQUE 2.7 MI. N OF, Garfield, CO | Pass | State |
| 2026-06-10 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2026-06-10 | HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file | HARTFORD, Hartford, CT | Fail | State |
| 2026-06-10 | NASA KENNEDY SPACE CENTER | JOHN F KENNEDY SPACE CENTER, Brevard, FL | Pass | State |
| 2026-06-10 | BREITBURN OPERATING LP — high-priority violation on file | OCHOPEE, Collier, FL | Pass | State |
| 2026-06-10 | BREITBURN OPERATING LP — high-priority violation on file | OCHOPEE, Collier, FL | Pass | State |
| 2026-06-10 | BREITBURN OPERATING LP — high-priority violation on file | OCHOPEE, Collier, FL | Pass | State |
| 2026-06-10 | BREITBURN OPERATING LP — high-priority violation on file | OCHOPEE, Collier, FL | Pass | State |
| 2026-06-10 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-10 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-10 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-10 | HARDEE POWER PARTNERS LIMITED | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-10 | HARDEE POWER PARTNERS LIMITED | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-10 | HARDEE POWER PARTNERS LIMITED | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-10 | HARDEE POWER PARTNERS LIMITED | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-10 | SEMINOLE ELECTRIC COOPERATIVE, INC. | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-10 | SEMINOLE ELECTRIC COOPERATIVE, INC. | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-10 | L.V. THOMPSON, INC. (TAMCO) | TAMPA, Hillsborough, FL | Pass | State |
| 2026-06-10 | SHADY HILLS POWER COMPANY, L.L.C. | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-06-10 | SHADY HILLS POWER COMPANY, L.L.C. | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-06-10 | SHADY HILLS POWER COMPANY, L.L.C. | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-06-10 | SHADY HILLS POWER COMPANY, L.L.C. | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-06-10 | SHADY HILLS POWER COMPANY, L.L.C. | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-06-10 | SHADY HILLS POWER COMPANY, L.L.C. | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-06-10 | THOMAS A. SMITH ENERGY FACILITY | DALTON, Murray, GA | Pass | State |
| 2026-06-10 | THOMAS A. SMITH ENERGY FACILITY | DALTON, Murray, GA | Pass | State |
| 2026-06-10 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-10 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-10 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-10 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-10 | CITGO PETROLEUM CORP — high-priority violation on file | LEMONT, Will, IL | Pending | State |
| 2026-06-10 | ADVANCED BEARING MATERIALS LLC | GREENSBURG, Decatur, IN | Pass | State |
| 2026-06-10 | ADVANCED BEARING MATERIALS LLC | GREENSBURG, Decatur, IN | Pass | State |
| 2026-06-10 | ADVANCED BEARING MATERIALS LLC | GREENSBURG, Decatur, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.