Hydrogen fluoride
Hydrogen fluoride at Marathon Mandan Refinery have more than three-quarters since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
Marathon Mandan Refinery
Total reported releases 312k lb fell meaningfully year over year (-18%). Total releases concentrations have more than halved since 2010.
900 OLD RED TRL NE, Mandan, North Dakota · 324110 · Petroleum · operated by Marathon Petroleum CORP
Anomaly engine
Notable Signals
Ammonia
Ammonia at Marathon Mandan Refinery have more than three-quarters since 2010 (through 2024).
Total reported releases
Total reported releases at Marathon Mandan Refinery have more than halved since 2010 (through 2024).
Chemicals reported · most recent year
What This Facility Releases
Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)
Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) concentrations are roughly unchanged from 2010.
Propylene
Propylene concentrations are up 21% since 2010.
Toluene
Toluene concentrations are roughly unchanged from 2010.
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations have fallen 22% since 2010.
Ethylene
Ethylene concentrations are up 22% since 2010.
Methanol
Methanol concentrations have more than doubled since 2010.
Phenol
Phenol concentrations are roughly unchanged from 2010.
n-Hexane
n-Hexane concentrations have fallen 14% since 2010.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (9 Census block groups, population-weighted demographics): a population of 13,258. Why we surface this →
21.8%
Low-income
14.9%
People of color
4.4%
Under age 5
18.0%
Over age 64
Source: Census ACS 2018-2022 block-group demographics, population-weighted across the 3-mile buffer around this facility (from USEPA-clone/EJAM-open blockgroupstats). 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.