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.