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 |
|---|---|---|---|---|
| 2025-11-11 | ENTERPRISE - OXY SAND DUNES NORTH COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-11-11 | ISLAND BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2025-11-11 | EOG - GUNSLINGER LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-11-11 | PROCLAMATION LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-11-11 | STEELHEAD BATTERY NO1 | EUNICE, Lea, NM | Pass | State |
| 2025-11-11 | NITRO COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2025-11-11 | NITRO COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2025-11-11 | CRONUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-11-11 | CRONUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-11-11 | APEX REGIONAL LANDFILL — high-priority violation on file | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | EOG RESOURCES, INC. - BLUE BUTTERFLY GY VAL PAD | BUFFALO, Guernsey, OH | Pass | State |
| 2025-11-11 | WATSONTOWN BRICK CO/WATSONTOWN PLT | WATSONTOWN, Northumberland, PA | Pass | State |
| 2025-11-11 | IRON MOUNTAIN INFORMATION MANAGEMENT LLC/BOYERS | BOYERS, Butler, PA | Pass | State |
| 2025-11-11 | REGENCY MARCELLUS GATHERING LLC/BRADFORD WEST COMP STA | GRANVILLE SUMMIT, Bradford, PA | Pass | State |
| 2025-11-11 | COLUMBIA GAS TRANS LLC/REDD FARM COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-11-11 | EXPAND OPERATING LLC/JOEGUSWA WELL PAD | DUSHORE, Sullivan, PA | Pass | State |
| 2025-11-11 | EXPAND OPERATING LLC/STONE BRA PAD | WYALUSING, Bradford, PA | Pass | State |
| 2025-11-11 | SANTEE COOPER CROSS GENERATING STATION — high-priority violation on file | PINEVILLE, Berkeley, SC | Pass | State |
| 2025-11-11 | MICHELIN NORTH AMERICA INC - SPARTANBURG FACILITY (US3) | SPARTANBURG, Spartanburg, SC | Pending | State |
| 2025-11-11 | PETE LIEN & SONS, INC. MAIN PLANT | RAPID CITY, Pennington, SD | Pass | State |
| 2025-11-11 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-11 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-11 | XCEL ENERGY - FRENCH ISLAND GENERATING PLANT | LA CROSSE, La Crosse, WI | Pass | State |
| 2025-11-11 | ASHLEY FURNITURE INDUSTRIES LLC — high-priority violation on file | ARCADIA, Vernon, WI | Fail | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-11 | WELL DRAW - AURORA COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-11 | WELL DRAW - AURORA COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-11 | WELL DRAW - AURORA COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-11 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-11 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-11 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-11 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-10 | APAC-CENTRAL, INC. - GRAVETTE QUARRY — high-priority violation on file | GRAVETTE, Benton, AR | Pass | State |
| 2025-11-10 | APAC-CENTRAL, INC. - GRAVETTE QUARRY — high-priority violation on file | GRAVETTE, Benton, AR | Pass | State |
| 2025-11-10 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2025-11-10 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2025-11-10 | ASARCO - HAYDEN SMELTER — high-priority violation on file | HAYDEN, Gila, AZ | Pass | State |
| 2025-11-10 | ASARCO - HAYDEN SMELTER — high-priority violation on file | HAYDEN, Gila, AZ | Pass | State |
| 2025-11-10 | TESORO REFINING AND MARKETING CO — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-11-10 | LA CO. SANITATION DIST | CARSON, Los Angeles, CA | Pass | Local |
| 2025-11-10 | PHILLIPS 66 PIPELINE LLC | LOS ANGELES, Los Angeles, CA | Pass | Local |
| 2025-11-10 | MID-AMERICA PIPELINE CO DOVE CR STA | DOVE CREEK 5.3 MI. NW OF, Dolores, CO | Pass | State |
| 2025-11-10 | OLEANDER POWER PROJECT, LP | COCOA, Brevard, FL | Pass | State |
| 2025-11-10 | CONCORDE/INTERSPACE BATTERY GEORGIA CORPORATION | AUSTELL, Cobb, GA | Pass | State |
| 2025-11-10 | CONCORDE/INTERSPACE BATTERY GEORGIA CORPORATION | AUSTELL, Cobb, GA | Pass | State |
| 2025-11-10 | OSMIUM DATA CENTER — high-priority violation on file | WEST DES MOINES, Warren, IA | Fail | State |
| 2025-11-10 | AMERICAN CRYSTAL SUGAR - MOORHEAD — high-priority violation on file | MOORHEAD, Clay, MN | Pass | State |
| 2025-11-10 | ENTERPRISE - OXY SAND DUNES NORTH COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-11-10 | SALADO DRAW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-10 | SALADO DRAW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-10 | SALADO DRAW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-10 | SALADO DRAW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-10 | SEAWOLF COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-10 | EOG - GUNSLINGER LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-11-10 | EOG - GUNSLINGER LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-11-10 | EOG - GUNSLINGER LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-11-10 | EOG - GUNSLINGER LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-11-10 | CRONUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-11-10 | CRONUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-11-10 | TEXAS EASTERN TRANSMISSIONS L.P. - SOMERSET | SOMERSET, Perry, OH | Pass | State |
| 2025-11-10 | TEXAS EASTERN TRANSMISSIONS L.P. - SOMERSET | SOMERSET, Perry, OH | Pass | State |
| 2025-11-10 | REGENCY MARCELLUS GAS GATHERING LLC/OGONTZ EAST COMP STA | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2025-11-10 | FAIRFIELD ROAD RECYCLING | COLUMBIA, Richland, SC | Pass | State |
| 2025-11-10 | GAINESVILLE CROSSING DATA CAMPUS - GCDC | GAINESVILLE, Prince William, VA | Pass | State |
| 2025-11-10 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-10 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-10 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-10 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-10 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-10 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-10 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-10 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-11-10 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-11-09 | HILCORP ENERGY COMPANY | CHUNCHULA, Mobile, AL | Pass | State |
| 2025-11-08 | HILCORP ENERGY COMPANY | CHUNCHULA, Mobile, AL | Pass | State |
| 2025-11-08 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Fail | Local |
| 2025-11-08 | WATEREE STATION | EASTOVER, Richland, SC | Pass | State |
| 2025-11-07 | LEHIGH CEMENT COMPANY | LEEDS, Jefferson, AL | Pass | Local |
| 2025-11-07 | LEHIGH CEMENT COMPANY | LEEDS, Jefferson, AL | Pass | Local |
| 2025-11-07 | DESOTO GATHERING COMPANY LLC - YELLOWSTONE CPF-2 | QUITMAN, Van Buren, AR | Pass | State |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.