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Monaca, PA · Final report 2025-06-04
Active investigationPA
On June 4, 2025, at approximately 2:19 p.m. local time, the Shell Polymers Monaca facility experienced an accidental release of butadiene and benzene from the ethane cracking unit. The inciden
The U.S. Chemical Safety and Hazard Investigation Board (CSB) is an independent federal agency that investigates serious chemical accidents to determine root causes and issue safety recommendations. It has no regulatory or enforcement authority — its power is the public investigation.
CSB investigation page ↗Source: U.S. Chemical Safety Board. License: CC0 1.0. Related: EPA RMP facilities nearby.