Total reported releases
Total reported releases at Premcor Refining Group INC Port Arthur have more than doubled since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
Premcor Refining Group INC Port Arthur
Total reported releases 646k lb rose modestly year over year (+8%). Total releases concentrations have more than doubled since 2010.
1801 S GULFWAY DR, Port Arthur, Texas · 324110 · Petroleum · operated by Valero Energy CORP
Anomaly engine
Notable Signals
Barium And Barium Compounds
Barium And Barium Compounds releases at Premcor Refining Group INC Port Arthur rose from 13k lb to 31k lb (2.4×) between 2023 and 2024.
Chemicals reported · most recent year
What This Facility Releases
Hydrogen cyanide
Hydrogen cyanide concentrations have fallen 40% since 2011.
Nitrate compounds (water dissociable; reportable only when in aqueous solution)
Nitrate compounds (water dissociable; reportable only when in aqueous solution) concentrations have more than doubled since 2010.
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 up 77% since 2010.
Barium And Barium Compounds
Barium And Barium Compounds concentrations have more than doubled since 2023.
Ammonia
Ammonia concentrations are up 21% since 2010.
Toluene
Toluene concentrations are up 82% since 2010.
n-Hexane
n-Hexane concentrations have more than doubled since 2010.
Carbonyl sulfide
Carbonyl sulfide concentrations have more than doubled since 2010.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (39 Census block groups, population-weighted demographics): a population of 33,653. Why we surface this →
54.0%
Low-income
91.5%
People of color
7.3%
Under age 5
12.7%
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.