1,2,4-Trimethylbenzene
1,2,4-Trimethylbenzene releases at Tesoro Refining & Marketing CO LLC rose from 2k lb to 37k lb (18.0×) between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Tesoro Refining & Marketing CO LLC
Total reported releases 174k lb rose sharply year over year (+43%). Total releases concentrations are roughly unchanged from 2010.
W MARCH POINT RD, Anacortes, Washington · 324110 · Petroleum · operated by Marathon Petroleum CORP
Anomaly engine
Notable Signals
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.
1,2,4-Trimethylbenzene
1,2,4-Trimethylbenzene concentrations have more than doubled since 2010.
Toluene
Toluene concentrations have fallen 28% since 2010.
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations have more than halved since 2010.
Ammonia
Ammonia concentrations have more than doubled since 2010.
Hydrogen sulfide
Hydrogen sulfide concentrations are up 12% since 2012.
Cyclohexane
Cyclohexane concentrations have fallen 21% since 2010.
Tetrachloroethylene
Tetrachloroethylene 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 (2 Census block groups, population-weighted demographics): a population of 1,059. Why we surface this →
49.7%
Low-income
63.1%
People of color
4.3%
Under age 5
20.9%
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.