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 |
|---|---|---|---|---|
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-08-19 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-08-18 | BIRMINGHAM TERMINAL | BIRMINGHAM, Jefferson, AL | Pending | Local |
| 2026-08-18 | BIRMINGHAM TERMINAL | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-08-18 | HYBAR LLC | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-08-18 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2026-08-18 | EL PASO NATURAL GAS CO - SELIGMAN COMPRESSOR STATION | SELIGMAN, Yavapai, AZ | Pass | State |
| 2026-08-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-18 | FOSTER FOOD PRODUCTS — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-08-18 | FOSTER FOOD PRODUCTS — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-08-18 | FOSTER FOOD PRODUCTS — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-08-18 | FOSTER FOOD PRODUCTS — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-08-18 | PHILLIPS 66 PIPELINE - DENVER TERMINAL | COMMERCE CITY, Adams, CO | Pass | State |
| 2026-08-18 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2026-08-18 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2026-08-18 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2026-08-18 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-18 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-18 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-18 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-18 | HILLSBOROUGH COUNTY SOLID WASTE MGT DEPT | LITHIA, Hillsborough, FL | Pass | State |
| 2026-08-18 | DUKE ENERGY FLORIDA, LLC | DE BARY-ORANGE CITY DIVISION, Volusia, FL | Pass | State |
| 2026-08-18 | DUKE ENERGY FLORIDA, LLC | DE BARY-ORANGE CITY DIVISION, Volusia, FL | Pass | State |
| 2026-08-18 | DUKE ENERGY FLORIDA, LLC | DE BARY-ORANGE CITY DIVISION, Volusia, FL | Pass | State |
| 2026-08-18 | DUKE ENERGY FLORIDA, LLC | DE BARY-ORANGE CITY DIVISION, Volusia, FL | Pass | State |
| 2026-08-18 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-08-18 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-08-18 | CHEVRON PRODUCTS CO.-DORAVILLE TERM. | DORAVILLE, DeKalb, GA | Pass | State |
| 2026-08-18 | ILLINOIS POWER GENERATING CO | NEWTON, Jasper, IL | Pass | State |
| 2026-08-18 | EXXON MOBIL OIL CORP — high-priority violation on file | CHANNAHON, Will, IL | Pass | State |
| 2026-08-18 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-08-18 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-08-18 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-08-18 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-08-18 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-08-18 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Fail | State |
| 2026-08-18 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-08-18 | MID-STATES MATERIALS - BIG SPRINGS QUARRY | BIG SPRINGS QUARRY #27106, Douglas, KS | Pass | State |
| 2026-08-18 | CAPITAL MATERIALS-PROSIZER (PORT-0836) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-18 | CAPITAL MATERIALS-PROSIZER (PORT-0836) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-18 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pending | State |
| 2026-08-18 | US SPACE FORCE - CAVALIER SPACE FORCE STATION - AQ | CAVALIER, Pembina, ND | Pass | State |
| 2026-08-18 | ADM CORN PROCESSING — high-priority violation on file | COLUMBUS, Platte, NE | N/A | State |
| 2026-08-18 | GEORGIA-PACIFIC GYPSUM LLC | NEWINGTON, Rockingham, NH | Pending | State |
| 2026-08-18 | BABYLON RESOURCE RECOVERY FACILITY | WEST BABYLON, Suffolk, NY | Pass | State |
| 2026-08-18 | WILLETS POINT ASPHALT CORP | FLUSHING, Queens, NY | Pass | State |
| 2026-08-18 | TENNESSEE GAS PIPELINE CO - COMP STA 241 | LAFAYETTE, Onondaga, NY | Pass | State |
| 2026-08-18 | ASCENT RESOURCES - UTICA LLC - SMITHFIELD WELL PAD | ADENA, Jefferson, OH | Pass | State |
| 2026-08-18 | ASCENT RESOURCES - UTICA LLC - SMITHFIELD WELL PAD | ADENA, Jefferson, OH | Pass | State |
| 2026-08-18 | ASCENT RESOURCES - UTICA LLC - SMITHFIELD WELL PAD | ADENA, Jefferson, OH | Pass | State |
| 2026-08-18 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-18 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-18 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-18 | HERRICK PAD 952535 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-18 | HERRICK PAD 952535 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-18 | HERRICK PAD 952535 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-18 | KOKOSING MATERIALS, INC. -- PLANT 522 | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2026-08-18 | REGENCY MARCELLUS GAS GATHERING LLC/BOBST MOUNTAIN COMP STA | COGAN STA, Lycoming, PA | Pass | State |
| 2026-08-18 | REGENCY MARCELLUS GAS GATHERING LLC/QUAKER STATE RD COMP STA | MONTOURSVILLE, Lycoming, PA | Pass | State |
| 2026-08-18 | EXPAND OPERATING LLC/MARCUCCI JONES PAD | STEVENSVILLE, Bradford, PA | Pass | State |
| 2026-08-18 | EXPAND OPERATING LLC/KAUFMANN WELL PAD | NEW ALBANY, Bradford, PA | Pass | State |
| 2026-08-18 | AMGEN MANUFACTURING, INC. | JUNCOS, Juncos, PR | Pass | U.S. EPA |
| 2026-08-18 | BOISE CASCADE WOOD PRODUCTS, LLC — high-priority violation on file | CHESTER, Chester, SC | Fail | State |
| 2026-08-18 | PANAGAKOS ASPHALT PAVING GREENVILLE | GREENVILLE, Greenville, SC | Pass | State |
| 2026-08-18 | CARDIN FOREST PRODUCTS, LLC | SOUTH PITTSBURG, Marion, TN | 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.