Ethylene glycol
Ethylene glycol releases at Markwest Hidalgo Plant rose from 67k lb to 167k lb (2.5×) between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Markwest Hidalgo Plant
Total reported releases 286k lb more than tripled year over year (+294%). Total releases concentrations are up 94% since 2022.
40351 FM 3541, Orla, Texas · 211130 · Natural Gas Processing · operated by Marathon Petroleum CORP
Anomaly engine
Notable Signals
Chemicals reported · most recent year
What This Facility Releases
Ethylene glycol
Ethylene glycol concentrations have more than doubled since 2023.
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations are up 75% since 2022.
Toluene
Toluene concentrations are up 77% since 2022.
n-Hexane
n-Hexane concentrations are up 93% since 2022.
Benzene
Benzene concentrations are up 79% since 2022.
Ethylbenzene
Ethylbenzene concentrations are up 77% since 2022.
Methanol
Methanol volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Culberson County County, TX (no Census block groups within 3 miles — falling back to containing county): a population of 2,181. Why we surface this →
22.2%
Low-income
88.6%
People of color
9.9%
Under age 5
21.7%
Over age 64
Source: Census ACS 2018-2022 (5-year), county-level fallback. 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.