Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
VERMILLION GAS PLANT
SE/4 SE/4 SEC 34 T13N R101W - T13N R101W, ROCK SPRINGS, WY, 82901
Parent company: MARATHON PETROLEUM CORP
Carcinogen
— EPA classifications across all reporting years
Top chemical totals
The 10 chemicals with the highest cumulative on-site releases in pounds (lbs) across all available years.
Full release table
Rows are years. Columns show the five highest-total chemicals across all years plus each year's total release volume.
| All values in pounds (lbs) | ||||||
|---|---|---|---|---|---|---|
| Year | n-Hexane | Toluene | Xylene (mixed isomers) | Benzene | Total (lbs) | |
| 2024 | 16,516 | 3,564 | 1,432 | 3,480 | 24,992 | |
| 2023 | 15,600 | 3,381 | 1,365 | 3,335 | 23,681 | |
| 2022 | 4,640 | — | 4,040 | — | 8,680 | |
▎ Facilities report to EPA's TRI once they manufacture, process, or use a listed chemical above set thresholds. Once that threshold is crossed, they must report actual releases regardless of size — so a small number reflects genuine low-level discharge, not a data error.