EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-09-17 | BCE MACH III LLC / BOLLENBACH 2 29H LSEOU 89 2 4HO LSEOU | KINGFISHER, Kingfisher, OK | Pass | State |
| 2025-09-17 | SENECA SUSTAINABLE ENERGY | EUGENE, Lane, OR | Pass | Local |
| 2025-09-17 | LAUREL MTN MIDSTREAM OPR LLC/SPRINGHILL COMP STA | LAKE LYNN, Fayette, PA | Pass | State |
| 2025-09-17 | MARKWEST LIBERTY BLUESTONE LLC/SARSEN GAS PROC PLT | EVANS CITY, Butler, PA | Pass | State |
| 2025-09-17 | REGENCY MARCELLUS GAS GATHERING LLC/ HIRKEY COMP STA | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-09-17 | REGENCY MARCELLUS GAS GATHERING LLC/QUAKER STATE RD COMP STA | MONTOURSVILLE, Lycoming, PA | Pass | State |
| 2025-09-17 | CENTURY ALUMINUM OF SOUTH CAROLINA INC — high-priority violation on file | GOOSE CREEK, Berkeley, SC | Fail | State |
| 2025-09-17 | SA RECYCLING LLC | HARRIMAN, Roane, TN | Pass | State |
| 2025-09-17 | VANTAGE DATA CENTERS VA2 LLC | STERLING, Loudoun, VA | Pass | State |
| 2025-09-17 | TRANSCO COMPRESSOR STATIONS 165 AND 166 | CHATHAM, Pittsylvania, VA | Pass | State |
| 2025-09-17 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-09-17 | CHEMTRADE SOLUTIONS LLC | ANACORTES, Skagit, WA | Pass | Local |
| 2025-09-17 | 3M PRAIRIE DU CHIEN BUILDING 50 | PRAIRIE DU CHIEN, Crawford, WI | Pass | State |
| 2025-09-17 | NEW LISBON ELECTRIC & WATER DEPT | NEW LISBON, Juneau, WI | Pass | State |
| 2025-09-17 | ARMSTRONG WORLD INDUSTRIES, INC., MILLWOOD | MILLWOOD, Jackson, WV | Pass | State |
| 2025-09-17 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-09-17 | FREWEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-17 | FREWEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-16 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2025-09-16 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2025-09-16 | GAS PROCESSORS, INC. | BROOKLYN, Conecuh, AL | Pass | State |
| 2025-09-16 | GAS PROCESSORS, INC. | BROOKLYN, Conecuh, AL | Pass | State |
| 2025-09-16 | GAS PROCESSORS, INC. | BROOKLYN, Conecuh, AL | Pass | State |
| 2025-09-16 | GAS PROCESSORS, INC. | BROOKLYN, Conecuh, AL | Pass | State |
| 2025-09-16 | JOHNS MANVILLE INC. | PHENIX CITY, Russell, AL | Pass | State |
| 2025-09-16 | JOHNS MANVILLE INC. | PHENIX CITY, Russell, AL | Pass | State |
| 2025-09-16 | POWERSOUTH ENERGY COOPERATIVE INC | LEROY, Washington, AL | Pass | State |
| 2025-09-16 | UNITED STATES STEEL CORPORATIONFAIRFIELD PIPE MIL | FAIRFIELD, Jefferson, AL | Pass | Local |
| 2025-09-16 | TRUSSVILLE LIQUEFIED NATURAL GAS PLANT | TRUSSVILLE, Jefferson, AL | Pass | Local |
| 2025-09-16 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-3 | SPRINGFIELD, Conway, AR | Pass | State |
| 2025-09-16 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-3 | SPRINGFIELD, Conway, AR | Pass | State |
| 2025-09-16 | AECC - MAGNET COVE GENERATING STATION | MALVERN, Hot Spring, AR | Pass | State |
| 2025-09-16 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Pass | State |
| 2025-09-16 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2025-09-16 | LA CITY, DWP HARBOR GENERATING STATION | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2025-09-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2025-09-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2025-09-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2025-09-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2025-09-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2025-09-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-16 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-16 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-16 | EAST SHORE WATER POLL ABATEMENT FACILITY | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-09-16 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - WATER TREATMENT PLANT — high-priority violation on file | GROTON, New London, CT | Pass | State |
| 2025-09-16 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-16 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-16 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-16 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pass | State |
| 2025-09-16 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.