Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
ONEOK ROCKIES MIDSTREAM LLC - GRASSLANDS GAS PLANT
16001 BENNIE PEER ROAD, ALEXANDER, ND, 58831
Parent company: ONEOK INC
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 | Hydrogen sulfide | n-Hexane | Cyclohexane | Toluene | Benzene | Total (lbs) |
| 2024 | 12,136,671 | 10,885 | 4,920 | 1,687 | 427 | 12,154,941 |
| 2023 | 12,911,553 | 8,348 | 3,641 | 1,615 | 384 | 12,925,831 |
| 2022 | 13,913,881 | 8,503 | — | 1,614 | 380 | 13,924,601 |
▎ 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.