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Washington chemical tank was called unfit for service before deadly failure, investigators find

Federal investigators said the tank had severe wall thinning and should have been removed from service months before it failed.

  • A federal report released Friday by the U.S. Chemical Safety Board found a chemical tank at the Nippon Dynawave Packaging Company mill in Longview was "not fit for continued service" 10 months before it failed in May, killing 11 people.
  • In July 2025, inspection contractor Applied Technical Services LLC identified "significant thinning" in the tank's lower regions and recommended repairs; Nippon Dynawave did not remove the vessel from operation or derate it for reduced service before the deadly implosion.
  • The tank released roughly 900,000 gallons of "extremely hot highly caustic white liquor," destroying buildings and killing 11 workers in the electrical maintenance shop. Survivor Massey said, "We heard a loud rumbling," as the vessel imploded.
  • Earlier this week, the Washington Department of Ecology issued notice of 35 environmental violations to Nippon Dynawave, with the facility facing potential fines of up to $10,000 per violation, per day.
  • While the Chemical Safety Board continues its investigation, Nippon Dynawave stated it will not speculate on the cause but is working with agencies as they determine why the vessel failed despite prior inspection warnings.
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KPTV broke the news in Portland, United States on Friday, August 28, 2026.
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