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Cause of death released for 11 victims in Washington chemical tank rupture

Cause of death released for 11 victims in Washington chemical tank rupture

Summary

Eleven workers died from chemical burns after a large chemical tank broke at a paper mill in Longview, Washington, on May 26, 2026. Officials ruled all deaths accidental and investigations are ongoing to find the cause and improve safety.

Key Facts

  • The incident happened at Nippon Dynawave Packaging, about 50 miles from Portland, Oregon.
  • The tank contained white liquor, a chemical used in making paper pulp.
  • White liquor is made of sodium hydroxide, sodium sulfide, and disodium carbonate.
  • The tank held 900,000 gallons and was about two-thirds full when it ruptured.
  • All victims died mainly from alkaline chemical burns caused by the chemicals.
  • One victim also had blunt force injuries; another died from chemical burns and asphyxia.
  • State and federal agencies are investigating the accident, with safety checks expected to take about six months.
  • Officials called the tragedy one of the worst the community has seen since 1980’s Mount St. Helens eruption.
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