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 |
|---|---|---|---|---|
| 2026-08-20 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2026-08-20 | YALE UNIVERSITY / CENTRAL POWER PLANT | NEW HAVEN, New Haven, CT | Pass | State |
| 2026-08-20 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-08-20 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-08-20 | KOOTENAI RENEWABLE ENERGY LLC - FIGHTING CREEK | COEUR D'ALENE, Kootenai, ID | Pending | State |
| 2026-08-20 | GRAIN PROCESSING CORPORATION — high-priority violation on file | WASHINGTON, Daviess, IN | Pass | State |
| 2026-08-20 | FARMERS CO-OP GRAIN ASSN. - BELLE PLAINE (AIR) | BELLE PLAINE, Sumner, KS | Pass | State |
| 2026-08-20 | HOLLY COMMON POINT #3 COMPRESSOR STATION | GRAND CANE, De Soto, LA | Pass | State |
| 2026-08-20 | BUCKEYE TERMINALS, LLC - NILES TERMINAL | NILES, Berrien, MI | Pass | State |
| 2026-08-20 | TES FILER CITY STATION | FILER CITY, Manistee, MI | Pass | State |
| 2026-08-20 | NOBLE HILL SANITARY LANDFILL | WILLARD, Greene, MO | Pass | State |
| 2026-08-20 | TURKEY TRACK CENTRAL GAS LIFT STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-08-20 | OXY USA INC - CORRAL CS 2S | MALAGA, Eddy, NM | Pass | State |
| 2026-08-20 | OXY USA INC - CORRAL CS 2S | MALAGA, Eddy, NM | Pass | State |
| 2026-08-20 | GOLDSTRIKE MINE | CARLIN, Eureka, NV | Pass | State |
| 2026-08-20 | KINDER MORGANTENNESSEE GAS PIPELINE STATION 209 | CUMBERLAND, Guernsey, OH | Pass | State |
| 2026-08-20 | KINDER MORGANTENNESSEE GAS PIPELINE STATION 209 | CUMBERLAND, Guernsey, OH | Pass | State |
| 2026-08-20 | KINDER MORGANTENNESSEE GAS PIPELINE STATION 209 | CUMBERLAND, Guernsey, OH | Pass | State |
| 2026-08-20 | ASCENT RESOURCES - UTICA LLC - LEILA LND GR | CAMBRIDGE, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-08-20 | ASCENT RESOURCES - UTICA LLC - LEILA LND GR | CAMBRIDGE, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-08-20 | ASCENT RESOURCES - UTICA LLC - LEILA LND GR | CAMBRIDGE, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-08-20 | ASCENT RESOURCES - UTICA LLC - LEILA LND GR | CAMBRIDGE, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-08-20 | ASCENT RESOURCES - UTICA LLC - LEILA LND GR | CAMBRIDGE, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-08-20 | ASCENT RESOURCES - UTICA LLC - LEILA LND GR | CAMBRIDGE, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-08-20 | PENN MED LANCASTER GEN HOSP/LANCASTER GEN HOSP | LANCASTER, Lancaster, PA | Pass | State |
| 2026-08-20 | EQM GATHERING OPCO LLC/STEELHEAD COMP STA | MARIANNA, Washington, PA | Pass | State |
| 2026-08-20 | AYERST-WYETH PHARMACEUTICALS, INC. | GUAYAMA, Guayama, PR | Pass | U.S. EPA |
| 2026-08-20 | COOPERVISION MANUFACTURING PUERTO RICO LLC | JUANA DIAZ, Juana Diaz, PR | Pass | U.S. EPA |
| 2026-08-20 | ES FOUNDRY CORP - GREENWOOD PLANT | GREENWOOD, Greenwood, SC | Pending | State |
| 2026-08-20 | CLARIOS LLC — high-priority violation on file | WEST UNION, Oconee, SC | Pending | State |
| 2026-08-20 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-20 | SILVER CREEK PROCESSING PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-08-20 | QUIKRETE CONSTRUCTION MATERIALS, LLC, QUIKRETE CEMENT — high-priority violation on file | MARTINSBURG, Berkeley, WV | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-20 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-19 | BIRMINGHAM TERMINAL | BIRMINGHAM, Jefferson, AL | Pending | Local |
| 2026-08-19 | BIRMINGHAM TERMINAL | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-08-19 | DESOTO GATHERING COMPANY, LLC - PHILLIPS MOUNTAIN CPF-2 | CLEVELAND, Conway, AR | Pass | State |
| 2026-08-19 | DESOTO GATHERING COMPANY LLC - PIKE CPF-1 | HATTIEVILLE, Conway, AR | Pass | State |
| 2026-08-19 | HENRY PRODUCTS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-08-19 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2026-08-19 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2026-08-19 | YALE UNIVERSITY / CENTRAL POWER PLANT | NEW HAVEN, New Haven, CT | Pass | State |
| 2026-08-19 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-19 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-19 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-19 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | 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.