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Superior, WI · Final report 2022-12-29
CompletedWI
The refinery was shutting down in preparation for a five-week turnaround when an explosion occurred, sending several people to area hospitals with injuries.
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.