Nitrate compounds (water dissociable; reportable only when in aqueous solution)
Nitrate compounds (water dissociable; reportable only when in aqueous solution) at Lion Oil CO have more than doubled since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
Lion Oil CO
Total reported releases 548k lb held roughly steady year over year (-3%). Total releases concentrations have more than doubled since 2010.
1000 MCHENRY AVE, El Dorado, Arkansas · 324110 · Petroleum · operated by Delek US Holdings INC
Anomaly engine
Notable Signals
Total reported releases
Total reported releases at Lion Oil CO have more than doubled since 2010 (through 2024).
Xylene (mixed isomers)
Xylene (mixed isomers) releases at Lion Oil CO rose from 8k lb to 22k lb (2.9×) between 2023 and 2024.
Chemicals reported · most recent year
What This Facility Releases
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.
Hydrogen cyanide
Hydrogen cyanide concentrations are up 64% since 2014.
Hydrogen sulfide
Hydrogen sulfide concentrations have more than doubled since 2012.
n-Hexane
n-Hexane concentrations have fallen 42% since 2010.
Ammonia
Ammonia concentrations are roughly unchanged from 2010.
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations are up 19% since 2010.
Toluene
Toluene concentrations are roughly unchanged from 2010.
1,2,4-Trimethylbenzene
1,2,4-Trimethylbenzene 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 (19 Census block groups, population-weighted demographics): a population of 15,246. Why we surface this →
46.4%
Low-income
57.5%
People of color
6.7%
Under age 5
15.9%
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.