N495
N495 releases at Catlettsburg Refining LLC fell from 41k lb to 0 lb (100% lower) between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Catlettsburg Refining LLC
Total reported releases 226k lb fell meaningfully year over year (-30%). Total releases concentrations have fallen 34% since 2010.
11631 US RT 23, Catlettsburg, Kentucky · 324110 · Petroleum · operated by Marathon Petroleum CORP
Anomaly engine
Notable Signals
Zinc compounds
Zinc compounds releases at Catlettsburg Refining LLC fell from 22k lb to 5k lb (76% lower) between 2023 and 2024.
n-Hexane
n-Hexane releases at Catlettsburg Refining LLC fell from 70k lb to 35k lb (50% lower) between 2023 and 2024.
Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)
Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) at Catlettsburg Refining LLC have more than three-quarters since 2011 (through 2024).
Showing the 4 most editorially weighted signals out of 5. Lower-severity signals fold into the chemical breakdown and history charts below.
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 halved since 2010.
n-Hexane
n-Hexane concentrations have fallen 40% since 2010.
Ethylene
Ethylene concentrations have more than doubled since 2010.
Ammonia
Ammonia concentrations have more than doubled since 2011.
Benzene
Benzene concentrations have fallen 23% since 2010.
Toluene
Toluene concentrations have fallen 49% since 2010.
Propylene
Propylene concentrations have more than halved since 2010.
Xylene (mixed isomers)
Xylene (mixed isomers) 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 (3 Census block groups, population-weighted demographics): a population of 4,142. Why we surface this →
39.9%
Low-income
4.2%
People of color
5.4%
Under age 5
21.6%
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.