Hydrogen sulfide
Hydrogen sulfide releases at Chevron Phillips Chemical CO LP Sweeny Complex fell from 47k lb to 12k lb (74% lower) between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Chevron Phillips Chemical CO LP Sweeny Complex
Total reported releases 414k lb held roughly steady year over year (-3%). Total releases concentrations are roughly unchanged from 2010.
21441 LOOP 419, Sweeny, Texas · 325110 · Chemicals · operated by Chevron Phillips Chemical Co LLC
Anomaly engine
Notable Signals
Chemicals reported · most recent year
What This Facility Releases
Ethylene
Ethylene concentrations are roughly unchanged from 2010.
Propylene
Propylene concentrations are roughly unchanged from 2010.
Hydrogen sulfide
Hydrogen sulfide concentrations have more than halved since 2022.
Benzene
Benzene concentrations have fallen 22% since 2010.
Ethylbenzene
Ethylbenzene concentrations have more than doubled since 2011.
Ammonia
Ammonia concentrations have more than doubled since 2015.
n-Hexane
n-Hexane concentrations are up 51% since 2010.
1,3-Butadiene
1,3-Butadiene concentrations have fallen 28% since 2010.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (1 Census block groups, population-weighted demographics): a population of 776. Why we surface this →
54.6%
Low-income
30.4%
People of color
4.4%
Under age 5
10.7%
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.