Full Breakdown
Fatal Tank Rupture at Nippon Dynawave Packaging Plant Claims 11 Lives
6/12/2026, 9:04:43 AM
Tank Failure at Nippon Dynawave Packaging: Fatal Explosion Overview
On May 26 2026, a holding tank at the Nippon Dynawave Packaging facility in Longview, Washington, catastrophically ruptured during a morning shift change. The tank, containing “white liquor” – a caustic blend of sodium hydroxide, sodium sulfide and disodium carbonate used in pulp-and-paper processing – released a high-pH liquid that flooded the plant, damaged walls, flipped trucks and ignited a blast. Eleven employees died; nine others were seriously injured, including one firefighter.
Background: White Liquor and Facility Operations
Nippon Dynawave operates a kraft pulp and paper mill (?550 employees) and an adjacent liquid-packaging plant (?450 employees). The plant’s white-liquor tank was reported as being between 500,000 gallons and 900,000 gallons full at the time of failure, a discrepancy that remains unresolved.
Victim Count and Causes of Death
The Cowlitz County Coroner’s Office completed autopsies on ten victims; the Multnomah County Medical Examiner provided the eleventh’s findings. Eight victims died solely from alkaline chemical burns. Robert Wilson (48) also suffered blunt-force injuries; Braydon Finkas (38) died from chemical burns and asphyxia due to aspiration of a foreign object. Dillon Miller (27) died later at a Portland hospital from sodium-hydroxide and sodium-sulfide burns. All deaths were ruled accidental.
Data & Statistics
- Fatalities: 11 (8 burns only, 2 burns + additional injuries, 1 burns confirmed by Oregon examiner)
- Injured: 9 (including 1 firefighter)
- Tank capacity reports: ?500,000 gal, ?600,000 gal, ?900,000 gal; ?90,000 gal may remain inside the damaged vessel
- Environmental impact: ?3,000 dead fish in nearby dikes; 23 % of the contaminated area decontaminated to date
- Plant workforce: ?1,000 total (550 pulp-and-paper, 450 packaging)
Environmental and Community Impact
White-liquor entered the storm-drain system, raising pH in ditches that feed a sole-source aquifer supplying Longview’s drinking water. The EPA confirmed air quality is safe and water pH has returned to normal after flushing operations that diverted water to the Columbia River. Local officials warned of residual risk to back-yard ditches and pet access.
Official Statements & Agency Responses
- Governor Bob Ferguson: called the incident “the deadliest industrial tragedy in modern Washington state history.”
- Washington State Department of Labor & Industries: launched a six-month probe to identify workplace-safety violations.
- U.S. Chemical Safety and Hazard Investigation Board: conducting a parallel federal investigation.
- Cowlitz County Coroner’s Office: released autopsy findings, ruled all deaths accidental, and notified next-of-kin.
- EPA On-Scene Coordinator Brooks Stanfield: reported no detection of hydrogen sulfide or other air contaminants.
Criticism of Regulatory Oversight
Industry experts noted that “no state agency routinely inspects tanks like one that exploded in Longview,” highlighting a gap in preventive oversight that may have contributed to the disaster.
On-the-Ground Response
LFD Chief Brad Hannig praised community support and detailed decontamination of patients before hospital transport. Battalion Chief Mike Gorsuch described the scene as a “mass casualty scene.” First-responders deployed five fire engines, seven ambulances, a hazardous-materials team and multiple fire districts.
Conflicting Reports & Gaps
- Tank size: sources cite 80,000 gal, 600,000 gal, and 900,000 gal figures.
- Eleventh victim’s cause of death: initially unreported by Cowlitz County; later attributed to alkaline burns by the Multnomah County examiner.
- Initial death toll: early reports listed nine fatalities; the final count is eleven.
- Root cause of rupture: still under investigation; no definitive mechanical or procedural failure identified.
Verbatim Quotes
- “We are incredibly humbled by the outpouring of support from the community for our first responders and the affected families.” — Brad Hannig, Longview Fire Department Chief
- “It was very good to see the different levels of government all responding pretty effectively to a terrible situation,” — Jim Walsh, State Representative
- “the deadliest industrial tragedy in modern Washington state history.” — Bob Ferguson, Governor of Washington
What’s Next: Ongoing Investigations and Remediation
The Washington State Department of Labor & Industries and the U.S. Chemical Safety and Hazard Investigation Board will continue safety-violation reviews for up to six months. EPA monitoring of water and air persists, while plant operators work to decontaminate remaining residues and restore the drainage network. Legislative and regulatory reforms concerning large-capacity chemical tanks are expected to be discussed in upcoming state sessions.
