The mother of two Castle Rock brothers killed in the Nippon chemical spill has filed a lawsuit against the company, alleging negligence. The brothers were meeting in nearby buildings when the tank collapsed on May 26, 2026, killing 10 workers.
Cowlitz County Sheriff's Office records and Chemical Safety Board reports indicate Nippon knew the tank needed repairs 10 months before the spill. The lawsuit claims the company failed to address the known hazard, leading to the deaths.