EPA Air · stack tests by state and year
Air-emissions stack tests in Wyoming, 2025
- 1,362Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Wyoming during 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Wyoming, 2025
- Campbell County 398
- Sweetwater County 228
- Sublette County 184
- Converse County 177
- Albany County 102
- Carbon County 71
- Laramie County 59
- Johnson County 39
- Natrona County 22
- Lincoln County 20
- Big Horn County 19
- Platte County 17
- Uinta County 11
- Fremont County 6
- Washakie County 4
- Crook County 4
Wyoming, other years
Air-emissions stack tests recorded in Wyoming, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-05 | MICROSOFT CHEYENNE DATA CENTER (MICROSOFT CORPORATION) | CHEYENNE, Laramie, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE 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 | 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 | 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 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-26 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-25 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Pass | State |
| 2025-11-25 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Pass | State |
| 2025-11-24 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-24 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Pass | State |
| 2025-11-21 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-11-20 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-19 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-17 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-17 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-17 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-17 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-13 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | LARAMIE CEMENT PLANT (MOUNTAIN CEMENT CO.) — high-priority violation on file | LARAMIE, Albany, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-11-12 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-11-12 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-11-12 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-12 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-12 | WAMSUTTER COMPRESSOR STATION (COLORADO INTERSTATE GAS) | WAMSUTTER, Sweetwater, WY | Pass | State |
| 2025-11-12 | EAKIN COMPRESSOR STATION (MOUNTAIN WEST PIPELINE, LLC) | UINTA COUNTY, Uinta, WY | Pass | State |
| 2025-11-12 | EAKIN COMPRESSOR STATION (MOUNTAIN WEST PIPELINE, LLC) | UINTA COUNTY, Uinta, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.