Xylene (mixed isomers)
Xylene (mixed isomers) releases at Superior Refining CO LLC rose from 52k lb to 83k lb between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Superior Refining CO LLC
Total reported releases 356k lb rose sharply year over year (+55%). Total releases concentrations have more than doubled since 2010.
2407 STINSON AVE, Superior, Wisconsin · 324110 · Petroleum · operated by Superior Refining Co LLC
Anomaly engine
Notable Signals
1,2,4-Trimethylbenzene
1,2,4-Trimethylbenzene releases at Superior Refining CO LLC rose from 42k lb to 66k lb between 2023 and 2024.
Toluene
Toluene releases at Superior Refining CO LLC rose from 46k lb to 71k lb between 2023 and 2024.
Chemicals reported · most recent year
What This Facility Releases
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations have more than doubled since 2011.
n-Hexane
n-Hexane concentrations have more than doubled since 2011.
Toluene
Toluene concentrations have more than doubled since 2010.
1,2,4-Trimethylbenzene
1,2,4-Trimethylbenzene concentrations have more than doubled since 2013.
Benzene
Benzene concentrations have more than doubled since 2010.
Ethylbenzene
Ethylbenzene concentrations have more than doubled since 2011.
Naphthalene
Naphthalene concentrations are up 67% since 2023.
Cumene
Cumene concentrations have more than doubled since 2013.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (21 Census block groups, population-weighted demographics): a population of 22,011. Why we surface this →
29.6%
Low-income
11.0%
People of color
4.8%
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.