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 |
|---|---|---|---|---|
| 2025-12-30 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-30 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-29 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-22 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-22 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-22 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-22 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-18 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-18 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-18 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-18 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-18 | WORLAND FACTORY (WYOMING SUGAR CO.) | WORLAND, Washakie, WY | Pass | State |
| 2025-12-18 | WORLAND FACTORY (WYOMING SUGAR CO.) | WORLAND, Washakie, WY | Pass | State |
| 2025-12-18 | WORLAND FACTORY (WYOMING SUGAR CO.) | WORLAND, Washakie, WY | Pass | State |
| 2025-12-18 | WORLAND FACTORY (WYOMING SUGAR CO.) | WORLAND, Washakie, WY | Pass | State |
| 2025-12-16 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-12-16 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-12-16 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-12-16 | CHAIN LAKES I5 35 4H-8H PAD (CROWHEART ENERGY, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-16 | CHAIN LAKES I5 35 4H-8H PAD (CROWHEART ENERGY, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-16 | CHAIN LAKES I5 35 4H-8H PAD (CROWHEART ENERGY, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-15 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-15 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-15 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-10 | PARADISE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-12-09 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-09 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-09 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-08 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-08 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-08 | CROSSBOW COMPRESSOR STATION (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, 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 |
| 2025-12-05 | 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 |
| 2025-12-05 | 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 |
| 2025-12-05 | 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 |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.