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 |
|---|---|---|---|---|
| 2025-08-11 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-11 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-11 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-11 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-11 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-11 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-11 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-11 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-11 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-11 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-08 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-06 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-06 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-06 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-06 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-05 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-05 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-05 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-05 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-05 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-05 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-05 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-08-05 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-31 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-31 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-31 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-31 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-31 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-31 | GRANGER SODA ASH FACILITY (WE SODA WYOMING LP) | GRANGER, Sweetwater, WY | Pass | State |
| 2025-07-30 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-30 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-30 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-30 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-30 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-30 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-30 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-30 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-07-30 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-07-30 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2025-07-30 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2025-07-30 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2025-07-30 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2025-07-30 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-30 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-29 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-29 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-29 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-29 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-29 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-07-29 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-29 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-29 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-29 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-29 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-07-29 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-07-29 | NAUGHTON PLANT (PACIFICORP) | KEMMERER, Lincoln, WY | Pass | State |
| 2025-07-29 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-29 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-29 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-29 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-29 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-07-28 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-28 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-28 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-28 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-28 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-28 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-28 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-07-28 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-07-24 | DAVE JOHNSTON (PACIFICORP) | GLENROCK, Converse, WY | Pass | State |
| 2025-07-24 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2025-07-24 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2025-07-24 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2025-07-23 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2025-07-23 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-07-23 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.