Oneok Rockies Midstream LLC - Grasslands Gas Plant
Total reported releases 12.2M lb fell modestly year over year (-6%). Total releases concentrations have fallen 13% since 2022.
16001 BENNIE PEER ROAD, Alexander, North Dakota · 211130 · Natural Gas Processing · operated by Oneok INC
Notable Signals
No notable signals at this facility for the current reporting year. See chemicals and equity context below for the full picture.
What This Facility Releases
Hydrogen sulfide
Hydrogen sulfide concentrations have fallen 13% since 2022.
Diethanolamine
Diethanolamine concentrations are up 23% since 2023.
n-Hexane
n-Hexane concentrations have fallen 31% since 2022.
Cyclohexane
Cyclohexane concentrations have more than doubled since 2022.
Toluene
Toluene concentrations have fallen 34% since 2022.
Benzene
Benzene concentrations have more than halved since 2022.
Methanol
Methanol concentrations have more than halved since 2022.
Who Lives Next To This Facility
McKenzie County County, ND (no Census block groups within 3 miles — falling back to containing county): a population of 14,081. Why we surface this →
Low-income
People of color
Under age 5
Over age 64
Source: Census ACS 2018-2022 (5-year), county-level fallback. Indicator-level percentile and EJ-disparity scores are surfaced on the county page and the state page — they describe wider regional exposure burdens, not effects attributable to a single facility.
Source. EPA Toxics Release Inventory · retrieved 2026-05-07. Reporting year 2024. TRI is a federal public-domain dataset under 17 USC §105.
What this is not. TRI quantifies releases reported by the facility under EPCRA §313 — not ambient air or water concentrations measured at receptors. We do not attribute individual health outcomes to specific facilities; that exceeds what the data can support.