Stateline Complex
Total reported releases 19k lb rose sharply year over year (+57%). Total releases concentrations are up 55% since 2022.
15071 56TH STREET NW, Williston, 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
n-Hexane
n-Hexane concentrations are up 23% since 2022.
Cyclohexane
Cyclohexane volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
Toluene
Toluene volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
Benzene
Benzene concentrations are up 26% since 2022.
Methanol
Methanol concentrations have more than halved since 2022.
Who Lives Next To This Facility
Williams County County, ND (no Census block groups within 3 miles — falling back to containing county): a population of 39,076. 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.