n-Hexane
n-Hexane releases at Motiva-Port Arthur Refinery rose from 16k lb to 58k lb (3.6×) between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Motiva-Port Arthur Refinery
Total reported releases 492k lb held roughly steady year over year (-1%). Total releases concentrations have fallen 43% since 2010.
2555 SAVANNAH AVE, Port Arthur, Texas · 324110 · Petroleum · operated by Aramco Services Co
Anomaly engine
Notable Signals
Chemicals reported · most recent year
What This Facility Releases
Hydrogen cyanide
Hydrogen cyanide concentrations are roughly unchanged from 2017.
Ammonia
Ammonia concentrations have more than doubled since 2010.
n-Hexane
n-Hexane concentrations have more than doubled since 2010.
Toluene
Toluene concentrations have more than doubled since 2010.
Hydrogen sulfide
Hydrogen sulfide concentrations are up 11% since 2012.
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations have more than doubled since 2010.
Benzene
Benzene concentrations have more than doubled since 2010.
1,2,4-Trimethylbenzene
1,2,4-Trimethylbenzene concentrations have fallen 24% since 2010.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (34 Census block groups, population-weighted demographics): a population of 28,477. Why we surface this →
53.8%
Low-income
91.8%
People of color
7.2%
Under age 5
13.0%
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.