EPA Air · stack tests by county and year
Air-emissions stack tests in Sweetwater County, Wyoming, 2026
- 129Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Sweetwater County, Wyoming during 2026. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Sweetwater County facility page.
Sweetwater County, Wyoming, 2026
- Inspections 12
Air-emissions stack tests in Sweetwater County, other years
Air-emissions stack tests recorded in Sweetwater County, Wyoming, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-07-30 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-07-30 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-07-29 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-07-29 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-07-16 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | Pass | State |
| 2026-07-16 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | Pass | State |
| 2026-07-16 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | Pass | State |
| 2026-07-09 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-07-09 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-07-08 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-07-07 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-07-07 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-07-07 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-07-07 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-07-07 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-07-07 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-07-07 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-06-24 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-06-24 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-06-24 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-06-24 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-23 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-23 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-11 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-06-11 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-06-10 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-06-10 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-06-09 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-06-09 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-06-01 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | Pass | State |
| 2026-05-27 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-05-27 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-05-27 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | Pass | State |
| 2026-05-21 | GRANGER SODA ASH FACILITY (WE SODA WYOMING LP) | Pass | State |
| 2026-05-21 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-05-21 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-05-21 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-05-21 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-05-20 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-05-20 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | Pass | State |
| 2026-05-14 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | Pass | State |
| 2026-05-14 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | Pass | State |
| 2026-05-14 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | Pass | State |
| 2026-05-14 | WESTVACO FACILITY (WE SODA WYOMING LP) | Pass | State |
| 2026-05-14 | WESTVACO FACILITY (WE SODA WYOMING LP) | Pass | State |
| 2026-05-11 | WESTVACO FACILITY (WE SODA WYOMING LP) | Pass | State |
| 2026-05-11 | WESTVACO FACILITY (WE SODA WYOMING LP) | Pass | State |
| 2026-05-05 | WESTVACO FACILITY (WE SODA WYOMING LP) | Pass | State |
| 2026-04-07 | RINER STATION (SOUTHERN STAR CENTRAL GAS PIPELINE) | Pass | State |
| 2026-04-07 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | Pass | State |
| 2026-04-07 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | Pass | State |
| 2026-04-07 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | Pass | State |
| 2026-04-02 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-04-02 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-03-31 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-03-31 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-03-31 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | Pass | State |
| 2026-03-20 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.