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 |
|---|---|---|---|---|
| 2026-07-16 | DOMTAR PAPER COMPANY LLC | BENNETTSVILLE, Marlboro, SC | Pass | State |
| 2026-07-16 | REEVES CONSTRUCTION COMPANY - DUNCAN ASPHALT PLANT | DUNCAN, Spartanburg, SC | Pass | State |
| 2026-07-16 | CHARTER WASTE LANDFILL | ODESSA, Ector, TX | Pass | State |
| 2026-07-16 | KYANITE MINING CORPORATION - WILLIS | DILLWYN, Buckingham, VA | Pending | State |
| 2026-07-16 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-16 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-16 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-16 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-07-16 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-07-16 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-07-15 | ALABAMA POWER COMPANY | WILSONVILLE, Shelby, AL | Pass | State |
| 2026-07-15 | APS WEST PHX POWER PLANT | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-07-15 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-15 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-15 | GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION | NEW HAVEN, New Haven, CT | Pending | State |
| 2026-07-15 | GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION | NEW HAVEN, New Haven, CT | Pending | State |
| 2026-07-15 | FRITO-LAY, INC. | DAYVILLE, Windham, CT | Pending | State |
| 2026-07-15 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-07-15 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-15 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-15 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-15 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-15 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-07-15 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-07-15 | HARTWELL ENERGY FACILITY | HARTWELL, Hart, GA | Pass | State |
| 2026-07-15 | HPOWER | KAPOLEI, Honolulu, HI | Pass | State |
| 2026-07-15 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-15 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-15 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-15 | PHARMACIA & UPJOHN CO LLC, A SUBSIDIARY OF PFIZER | KALAMAZOO, Kalamazoo, MI | Pass | State |
| 2026-07-15 | PACKAGING CORPORATION OF AMERICA - FILER CITY MILL | FILER CITY, Manistee, MI | Pass | State |
| 2026-07-15 | CONSUMERS ENERGY - ST. CLAIR COMPRESSOR STATION | IRA, St. Clair, MI | Pass | State |
| 2026-07-15 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-07-15 | GSP NEWINGTON LLC | NEWINGTON, Rockingham, NH | Pending | State |
| 2026-07-15 | EOG RESOURCES INC - CHEETAH CTB | CALDWELL, Noble, OH | Pass | State |
| 2026-07-15 | EOG RESOURCES INC - CHEETAH CTB | CALDWELL, Noble, OH | Pass | State |
| 2026-07-15 | EOG RESOURCES INC - CHEETAH CTB | CALDWELL, Noble, OH | Pass | State |
| 2026-07-15 | H H WOOD FIBER, LLC | MOUNT ORAB, Brown, OH | Pass | State |
| 2026-07-15 | H H WOOD FIBER, LLC | MOUNT ORAB, Brown, OH | Fail | State |
| 2026-07-15 | WILLIAMS FIELD SVC CO LLC/KANE ROAD COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-07-15 | HALLIDAY, A. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-07-15 | TUCKER, H. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-07-15 | RANGE RESOURCES APPALACHIA LLC/17 - 22 WELL PAD | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-07-15 | RANGE RESOURCES APPALACHIA LLC/17 - 22 WELL PAD | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-07-15 | ENVIVA SOUTHAMPTON | FRANKLIN, Southampton, VA | Pending | State |
| 2026-07-15 | CRYSTAL FINISHING SYSTEMS INC | SCHOFIELD, Marathon, WI | Pass | State |
| 2026-07-14 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-07-14 | RAZORBACK GATHERING COMPANY, LLC. - LITTLE RED RIVER CPF 1 | BALD KNOB, White, AR | Fail | State |
| 2026-07-14 | DESOTO GATHERING COMPANY, LLC.-OLIVER CPF-1 | SEARCY, White, AR | Fail | State |
| 2026-07-14 | CMC STEEL FABRICATORS | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-07-14 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-14 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-14 | PUBLIC SERVICE CO - HAYDEN PLT | HAYDEN, Routt, CO | Pass | State |
| 2026-07-14 | PUBLIC SERVICE CO - HAYDEN PLT | HAYDEN, Routt, CO | Pass | State |
| 2026-07-14 | DCP OPERATING CO - O'CONNOR GAS PLANT | KERSEY AREA, Weld, CO | Pass | State |
| 2026-07-14 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-07-14 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-07-14 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-07-14 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-14 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-14 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-14 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-14 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-07-14 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-07-14 | HARTWELL ENERGY FACILITY | HARTWELL, Hart, GA | Pass | State |
| 2026-07-14 | VALLEY PAVING & ASPHALT 00086 | COTTONWOOD, Idaho, ID | Pending | State |
| 2026-07-14 | HALL CONTRACTING OF KENTUCKY INCORPORATED | CHARLESTOWN, Clark, IN | Pass | State |
| 2026-07-14 | HALL CONTRACTING OF KENTUCKY INCORPORATED | CHARLESTOWN, Clark, IN | Pass | State |
| 2026-07-14 | HALL CONTRACTING OF KENTUCKY INCORPORATED | CHARLESTOWN, Clark, IN | Pass | State |
| 2026-07-14 | HALL CONTRACTING OF KENTUCKY INCORPORATED | CHARLESTOWN, Clark, IN | Pass | State |
| 2026-07-14 | KMEA - JAMESON ENERGY CENTER (AIR) | GARDEN CITY, Finney, KS | Pass | State |
| 2026-07-14 | CERTAINTEED LLC (AIR) — high-priority violation on file | KANSAS CITY, Wyandotte, KS | Pass | State |
| 2026-07-14 | BERKSHIRE POWER LLC | AGAWAM, Hampden, MA | Pending | State |
| 2026-07-14 | WILDCAT POINT GENERATION FACILITY | CONOWINGO, Cecil, MD | Pending | State |
| 2026-07-14 | WILDCAT POINT GENERATION FACILITY | CONOWINGO, Cecil, MD | Pending | State |
| 2026-07-14 | WSSC PISCATAWAY SWGE PLNT — high-priority violation on file | ACCOKEEK, Prince George's, MD | Pass | State |
| 2026-07-14 | GREDE II - BISCOE, LLC — high-priority violation on file | BISCOE, Montgomery, NC | Pending | State |
| 2026-07-14 | MASTEN LAKE QUARRY | MAMAKATING, Sullivan, NY | Pass | State |
| 2026-07-14 | TRIVIUM ALUMINUM PACKAGING USA CORPORATION | YOUNGSTOWN, Mahoning, OH | Pass | State |
| 2026-07-14 | TRIVIUM ALUMINUM PACKAGING USA CORPORATION | YOUNGSTOWN, Mahoning, OH | Pass | State |
| 2026-07-14 | ASCENT RESOURCES - UTICA, LLC - WASSMANN | BELLAIRE, Belmont, OH | Pass | State |
| 2026-07-14 | ASCENT RESOURCES - UTICA, LLC - WASSMANN | BELLAIRE, Belmont, OH | Pass | State |
| 2026-07-14 | ASCENT RESOURCES - UTICA, LLC - WASSMANN | BELLAIRE, Belmont, OH | Pass | State |
| 2026-07-14 | INR MIDSTREAM, LLC - REUSSER | LEWISVILLE, Monroe, OH | Pass | State |
| 2026-07-14 | INR MIDSTREAM, LLC - REUSSER | LEWISVILLE, Monroe, OH | Pass | State |
| 2026-07-14 | INR MIDSTREAM, LLC - REUSSER | LEWISVILLE, Monroe, OH | Pass | State |
| 2026-07-14 | INR MIDSTREAM, LLC - REUSSER | LEWISVILLE, Monroe, OH | Pass | State |
| 2026-07-14 | INR MIDSTREAM, LLC - REUSSER | LEWISVILLE, Monroe, OH | Pass | State |
| 2026-07-14 | INR MIDSTREAM, LLC - REUSSER | LEWISVILLE, Monroe, OH | Pass | State |
| 2026-07-14 | INR MIDSTREAM, LLC - REUSSER | LEWISVILLE, Monroe, OH | Pass | State |
| 2026-07-14 | INR MIDSTREAM, LLC - REUSSER | LEWISVILLE, Monroe, OH | Pass | State |
| 2026-07-14 | INR MIDSTREAM, LLC - REUSSER | LEWISVILLE, Monroe, OH | Pass | State |
| 2026-07-14 | NORTHUMBERLAND TERM DE LLC/NORTHUMBERLAND TERM | NORTHUMBERLAND, Northumberland, PA | Pass | State |
| 2026-07-14 | FLOWER, T. PAD 1 | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2026-07-14 | KING ASPHALT INC - MULLINS — high-priority violation on file | MULLINS, Marion, SC | Pass | State |
| 2026-07-14 | ANR PIPELINE COMPANY | BROWNSVILLE, Haywood, TN | Pending | State |
| 2026-07-14 | ENVIVA SOUTHAMPTON | FRANKLIN, Southampton, VA | Pending | State |
| 2026-07-14 | STRONGWELL CORPORATION/BRISTOL DIVISION | BRISTOL, Bristol (city), VA | Pending | State |
| 2026-07-14 | CARMEUSE LIME AND STONE - ROCKWELL OPERATION — high-priority violation on file | MANITOWOC, Manitowoc, WI | Pass | State |
| 2026-07-13 | ALABAMA POWER COMPANY | BUCKS, Mobile, AL | 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.