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 |
|---|---|---|---|---|
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | HEIDELBERG MATERIALS NE LLC/LITITZ ASPHALT | LITITZ, Lancaster, PA | Pending | State |
| 2026-08-25 | SENECA RESOURCES CORP/PHC COMP STA | CLEARFIELD, Clearfield, PA | Pass | State |
| 2026-08-25 | NATL FUEL GAS SUPPLY CORP/MARVINDALE COMP STA | MOUNT JEWETT, McKean, PA | Pass | State |
| 2026-08-25 | WEST FRASER US EWP LLC | FAIRFAX, Allendale, SC | Pending | State |
| 2026-08-25 | C R JACKSON INC - VARNVILLE ASPHALT PLANT — high-priority violation on file | VARNVILLE, Hampton, SC | Pass | State |
| 2026-08-25 | CORRIGAN OSB — high-priority violation on file | CORRIGAN, Polk, TX | Fail | State |
| 2026-08-25 | CENTRAL VALLEY WATER RECLAMATION | SALT LAKE CITY, Salt Lake, UT | Pass | State |
| 2026-08-25 | DOMINION ENERGY - ALTAVISTA POWER STATION | ALTAVISTA, Campbell, VA | Pending | State |
| 2026-08-24 | O&G INDUSTRIES, INC. | NEW MILFORD, Litchfield, CT | Pass | State |
| 2026-08-24 | O&G INDUSTRIES, INC. - SOUTHBURY QUARRY | SOUTHBURY, New Haven, CT | Pass | State |
| 2026-08-24 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2026-08-24 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-24 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-24 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-24 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-24 | PILGRIM'S PRIDE CORP. - CARROLLTON PLANT | CARROLLTON, Carroll, GA | Pass | State |
| 2026-08-24 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2026-08-24 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2026-08-24 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-08-24 | MATHY CONSTRUCTION - PLANT 18 | ONALASKA, Undetermined, WI | Pass | State |
| 2026-08-24 | HOUSE OF RAEFORD FARMS, INC. - WALLACE DIVISION | TEACHEY, Duplin, NC | Pass | State |
| 2026-08-24 | REGENCY MARCELLUS GAS GATHERING/CANOE RUN COMP STA | SALLADASBURG, Lycoming, PA | Pass | State |
| 2026-08-24 | MARKWEST LIBERTY MIDSTREAM/DRYER BOOSTER COMP STA | AVELLA, Washington, PA | Pass | State |
| 2026-08-24 | BAXTER HEALTHCARE OF PUERTO RICO | JAYUYA, Jayuya, PR | Pass | U.S. EPA |
| 2026-08-24 | C R JACKSON INC - BATESBURG ASPHALT PLANT | BATESBURG - LEESVILLE, Lexington, SC | Pass | State |
| 2026-08-24 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | N/A | State |
| 2026-08-24 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | N/A | State |
| 2026-08-24 | BEAUMONT CHEMICAL PLANT | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-24 | BEAUMONT CHEMICAL PLANT | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-24 | BEAUMONT CHEMICAL PLANT | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-24 | BEAUMONT CHEMICAL PLANT | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-24 | BEAUMONT CHEMICAL PLANT | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-24 | BEAUMONT CHEMICAL PLANT | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-24 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-24 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-24 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-24 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-24 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-24 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-24 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-23 | TENNESSEE VALLEY AUTHORITY - CUMBERLAND FOSSIL PLANT — high-priority violation on file | CUMBERLAND CITY, Stewart, TN | Pending | State |
| 2026-08-22 | GUAJILLO CENTRAL FACILITY | WHITSETT, Atascosa, TX | Pass | State |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-21 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-21 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-21 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-21 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-21 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | N/A | State |
| 2026-08-21 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pending | State |
| 2026-08-21 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-08-21 | HK CONTRACTORS INC 00079 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-08-21 | HK CONTRACTORS INC 00121 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-08-21 | HK CONTRACTORS INC 00168 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-08-21 | HK CONTRACTORS 00413 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-08-21 | HK CONTRACTORS INC 00463 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-08-21 | HK CONTRACTORS INC 00480 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-08-21 | HK CONTRACTORS 00495 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-08-21 | HK CONTRACTORS, INC. - 00739 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-08-21 | MID-STATES MATERIALS - DENISON QUARRY | HOYT, Jackson, KS | Pass | State |
| 2026-08-21 | ASCENT RESOURCES - UTICA, LLC - WAYNE A (NAC B WYN JF) | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-08-21 | ASCENT RESOURCES - UTICA, LLC - WAYNE A (NAC B WYN JF) | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-08-21 | ASCENT RESOURCES - UTICA, LLC - WAYNE A (NAC B WYN JF) | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-08-21 | ASCENT RESOURCES - UTICA LLC - NOLAN CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-08-21 | ASCENT RESOURCES - UTICA LLC - NOLAN CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-08-21 | ASCENT RESOURCES - UTICA LLC - NOLAN CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-08-21 | AMO PUERTO RICO MANUFACTURING, INC. | ANASCO, Anasco, PR | Pass | U.S. EPA |
| 2026-08-21 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-21 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-21 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-21 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-21 | ARKEMA BEAUMONT PLANT | BEAUMONT, Jefferson, TX | Pass | State |
| 2026-08-21 | CHEVRON PHILLIPS CHEMICAL PORT ARTHUR FACILITY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-08-21 | SILVER CREEK PROCESSING PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-08-21 | CHICO GAS PLANT | CHICO, Wise, TX | Pass | State |
| 2026-08-21 | JUSTIN WEST COMPRESSOR STATION | NEW FAIRVIEW, Wise, TX | Pass | State |
| 2026-08-20 | ASH GROVE CEMENT COMPANY | FOREMAN, Little River, AR | Pass | State |
| 2026-08-20 | DESOTO GATHERING COMPANY, LLC - SW GREER LAKE CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-08-20 | DESOTO GATHERING COMPANY, LLC - SW GREER LAKE CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-08-20 | FLEET READINESS CTR SOUTHWEST(USN AVIAT) | SAN DIEGO, San Diego, CA | Pass | Local |
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.