ENVIRONMENT

Mill Knew Tank Was Unfit 10 Months Before Deadly Blast

PUBLISHED Aug 29, 2026, 7:54 AM ET

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A federal investigation has revealed that a chemical storage tank at a Washington state paper mill was deemed unsafe for service months before it catastrophically failed, resulting in one of the deadliest U.S. workplace disasters in recent decades. The U.S. Chemical Safety and Hazard Investigation Board released findings regarding the May incident at the Nippon Dynawave Packaging Company mill in Longview, Washington. According to investigators, an inspection contractor found significant wall thinning below minimum safe thresholds in July, classifying the container as unfit for service without corrective action. Subsequent external inspections in October and February confirmed the persistent structural degradation, yet the facility kept the tank in operation. On May 26, the 1.2-million-gallon atmospheric storage vessel ruptured, releasing approximately 900,000 gallons of hot, caustic white liquor. The toxic flood and structural collapse trapped employees attending morning meetings, killing eleven workers and injuring several others. Federal probes into the exact root cause remain ongoing.

By James Porter | JQJO News

Timeline of Events

2025-07 — On July 2025 Contractor inspections classified the storage tank as critically unsafe.
2025-10 — On October 2025 External checks confirmed ongoing thinning without subsequent corrective actions.
2026-02 — On February 2026 Inspections again verified dangerously thin structural shell walls.
On May 26 2026 Catastrophic tank failure released toxic white liquor downtown.
On May 26 2026 Eleven workers died inside flooded adjacent meeting structures.
On May 26 2026 Emergency responders treated several injured personnel including firefighters.
On May 29 2026 Federal chemical safety investigators deployed to examine the site.
On August 2026 Investigators released updates highlighting ignored prior safety warnings.
On Future Years Federal regulators will mandate stricter industrial tank inspection compliance.
On Future Years Legal proceedings will determine corporate liability and criminal negligence.

News Intelligence

Immediate US impact: Federal agencies will tighten industrial chemical tank safety enforcement nationwide.
Possible long-term US impact: Increased regulatory scrutiny will prompt mandatory infrastructure audits across mills.
Most affected groups: Paper mill workers, industrial operators, and Longview community residents face impacts.
Reader priority: Readers should monitor official federal safety board investigative press releases.