Total reported releases
Total reported releases at Hf Sinclair Casper Refining LLC have more than three-quarters since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
Hf Sinclair Casper Refining LLC
Total reported releases 18k lb rose modestly year over year (+7%). Total releases concentrations have more than halved since 2010.
5700 E HWY 20/26, Casper, Wyoming · 324110 · Petroleum · operated by Hf Sinclair CORP
Anomaly engine
Notable Signals
Chemicals reported · most recent year
What This Facility Releases
Benzene
Benzene concentrations have fallen 31% since 2010.
Ethylene
Ethylene concentrations are up 43% since 2011.
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations have fallen 19% since 2010.
n-Hexane
n-Hexane concentrations have fallen 48% since 2010.
Propylene
Propylene concentrations have more than halved since 2010.
Toluene
Toluene concentrations have more than halved since 2010.
Hydrogen sulfide
Hydrogen sulfide concentrations are roughly unchanged from 2012.
Cumene
Cumene concentrations have more than halved since 2010.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (13 Census block groups, population-weighted demographics): a population of 18,449. Why we surface this →
26.4%
Low-income
14.8%
People of color
7.2%
Under age 5
16.6%
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.