Total reported releases
Total reported releases at St Charles Operations (Taft/Star) Union Carbide Corp have risen 63% since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
St Charles Operations (Taft/Star) Union Carbide Corp
Total reported releases 663k lb rose sharply year over year (+60%). Total releases concentrations are up 63% since 2010.
355 LA HWY 3142 (GATE 1), Hahnville, Louisiana · 325199 · Chemicals · operated by Dow INC
Anomaly engine
Notable Signals
Ethylene
Ethylene at St Charles Operations (Taft/Star) Union Carbide Corp have risen 53% since 2010 (through 2024).
Methyl acrylate
Methyl acrylate releases at St Charles Operations (Taft/Star) Union Carbide Corp rose from 6k lb to 103k lb (18.0×) between 2023 and 2024.
Methanol
Methanol releases at St Charles Operations (Taft/Star) Union Carbide Corp rose from 7k lb to 50k lb (7.1×) between 2023 and 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
Ammonia
Ammonia concentrations have more than doubled since 2010.
Ethylene
Ethylene concentrations are up 53% since 2010.
Methyl acrylate
Methyl acrylate concentrations have more than doubled since 2023.
1,4-Dioxane
1,4-Dioxane concentrations have more than doubled since 2010.
Methanol
Methanol concentrations have more than doubled since 2010.
Acrylic acid
Acrylic acid concentrations have more than doubled since 2010.
Hydroquinone
Hydroquinone concentrations have more than doubled since 2010.
Propylene
Propylene concentrations have fallen 47% 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 2,572. Why we surface this →
47.1%
Low-income
53.8%
People of color
4.3%
Under age 5
10.8%
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.