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 |
|---|---|---|---|---|
| 2025-12-02 | R & R JOHNSON LUMBER | CARTHAGE, Lewis, NY | Pass | State |
| 2025-12-02 | ASCENT RESOURCES - UTICA, LLC - HELLER | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES - UTICA, LLC - HELLER | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES - UTICA, LLC - HELLER | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES- UTICA, LLC - PAVICH | WAYNE, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES- UTICA, LLC - PAVICH | WAYNE, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES- UTICA, LLC - PAVICH | WAYNE, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | CARDINAL POWER PLANT (CARDINAL OPERATING COMPANY) | BRILLIANT, Jefferson, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | TEXAS EASTERN TRANS LP/HOLBROOK STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-12-02 | NFG MIDSTREAM COVINGTON LLC/FULLER 826N WELL PAD | MIDDLEBURY, Tioga, PA | Pass | State |
| 2025-12-02 | BROWN UNIVERSITY | PROVIDENCE, Providence, RI | Pass | State |
| 2025-12-02 | VALERO RENEWABLE FUELS COMPANY LLC — high-priority violation on file | AURORA, Brookings, SD | Pass | State |
| 2025-12-02 | GREEN BAY METRO SEWERAGE DIST | GREEN BAY, Brown, WI | Pass | State |
| 2025-12-02 | ANR PIPELINE CO - JANESVILLE COMPRESSOR | JANESVILLE, Rusk, WI | Pass | State |
| 2025-12-02 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-02 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-02 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-02 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-02 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-02 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-01 | DESOTO GATHERING COMPANY, LLC - GRIFFIN MOUNTAIN CPF-2 | JERUSALEM, Conway, AR | Pass | State |
| 2025-12-01 | DESOTO GATHERING COMPANY LLC - PIKE CPF-1 | HATTIEVILLE, Conway, AR | Pass | State |
| 2025-12-01 | BADGER CREEK LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-01 | BADGER CREEK LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-01 | BADGER CREEK LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-01 | BADGER CREEK LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-01 | BONANZA CREEK - STATE PRONGHORN CPF 41-3 | WIGGINS 11.6 MI. NW OF, Weld, CO | Fail | State |
| 2025-12-01 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-12-01 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-01 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-01 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-01 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-01 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-01 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-01 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-01 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-01 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-01 | APOLLO B CTB | JAL, Lea, NM | Pass | State |
| 2025-12-01 | APOLLO D CTB | JAL, Lea, NM | Pass | State |
| 2025-12-01 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-12-01 | EL CEDRO COMPRESSOR STATION | NAVAJO DAM, Rio Arriba, NM | N/A | State |
| 2025-12-01 | WINNEMUCCA COMPRESSOR STATION #4 | WINNEMUCCA, Humboldt, NV | Pass | State |
| 2025-12-01 | TEXAS EASTERN TRANS LP/WAYNESBURG STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-12-01 | EXCO APPLACHIA MIDSTREAM LLC/CONFER COMP STA | BURNSIDE TWP, Centre, PA | Pass | State |
| 2025-12-01 | NFG MIDSTREAM COVINGTON LLC/BREON COMP STA | MANSFIELD, Tioga, PA | Pass | State |
| 2025-12-01 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-01 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-01 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-01 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-01 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-26 | DCP OPERATING CO - ROGGEN NGPP — high-priority violation on file | KEENESBURG 4.4 MI. E OF, Weld, CO | Pass | State |
| 2025-11-26 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-11-26 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-11-26 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-11-26 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-11-26 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-11-26 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-11-26 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-11-26 | VOSS CLARK DBA PGP CORP | JEFFERSONVILLE, Clark, IN | Pass | State |
| 2025-11-26 | VOSS CLARK DBA PGP CORP | JEFFERSONVILLE, Clark, IN | Pass | State |
| 2025-11-26 | VOSS CLARK DBA PGP CORP | JEFFERSONVILLE, Clark, IN | Pass | State |
| 2025-11-26 | VOSS CLARK DBA PGP CORP | JEFFERSONVILLE, Clark, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.