What Happened to Nippon Dynawave Packaging Chemical Tank Implosion?
On May 26, 2026, a chemical tank containing 'white liquor' imploded at the Nippon Dynawave Packaging facility in Longview, Washington, resulting in a devastating industrial accident. The incident led to multiple fatalities and injuries, prompting extensive recovery efforts and an ongoing investigation by federal and state authorities. The facility, a subsidiary of Japan's Nippon Paper Group, has ceased most operations as the community grapples with the tragedy and environmental concerns.
Quick Answer
A catastrophic chemical tank implosion occurred at the Nippon Dynawave Packaging pulp and paper mill in Longview, Washington, on May 26, 2026. The incident, involving a 900,000-gallon tank of 'white liquor,' has resulted in 8 confirmed deaths and 3 workers still missing, with no hope of finding additional survivors as of May 29, 2026. Recovery operations are ongoing amidst a complex and hazardous site, while the U.S. Chemical Safety Board and state agencies investigate the cause and the facility remains largely shut down.
📊Key Facts
📅Complete Timeline13 events
Longview Facility Established
The Longview, Washington facility, now operated by Nippon Dynawave Packaging, began manufacturing liquid packaging board.
Nippon Paper Group Acquires Facility
Japan-based Nippon Paper Group acquired the Longview pulp and paper mill from Weyerhaeuser in a $285 million cash deal, forming Nippon Dynawave Packaging.
Multiple Safety Violations
Nippon Dynawave was fined $3,400 for three separate health and safety violations by the Washington Department of Labor and Industries.
Large Wood Chip Pile Fire
A significant fire at a wood chip pile on the mill property caused unhealthy air quality levels in Portland, with the exact cause remaining undetermined.
Another Fire and Investigation Citation
Another fire occurred on the Nippon property with no injuries. The company was also cited for moving equipment before an investigation into an employee's finger amputation could be completed.
Safety Complaint Filed
An anonymous safety complaint about a valve on a tank was filed against Nippon Dynawave, though it was unrelated to the tank that later imploded.
Additional Safety Complaint
Another safety complaint was filed in May, also unrelated to the imploded tank.
Chemical Tank Implosion Occurs
A 900,000-gallon tank of 'white liquor' ruptured and imploded at the Nippon Dynawave Packaging facility in Longview, Washington, causing a major industrial incident.
Initial Casualties and Environmental Impact
One worker was confirmed dead, nine were missing, and ten people (including a firefighter) were injured. White liquor spilled into the storm drain system, raising environmental concerns.
Death Toll Rises, Investigation Launched
A second worker died from injuries, bringing confirmed deaths to two. The U.S. Chemical Safety and Hazard Investigation Board (CSB) opened an investigation, and officials stated there was no hope of finding additional survivors among the missing.
Confirmed Deaths Reach Eight
The confirmed death toll climbed to eight, with three workers still unaccounted for. Recovery efforts continued amidst the unstable and leaking tank.
Six Bodies Recovered, Mill Remains Shut Down
Recovery crews successfully recovered six of the nine initially missing bodies. The mill remains largely shut down, with critical infrastructure operating minimally, and the company is paying non-working employees.
Ongoing Investigations and Environmental Monitoring
Federal and state investigations into the cause of the implosion are ongoing. Environmental agencies continue to monitor the impact of the white liquor spill on local waterways, including the Columbia River.
🔍Deep Dive Analysis
The Nippon Dynawave Packaging facility in Longview, Washington, became the site of a tragic industrial disaster on May 26, 2026, when a large chemical tank imploded. The incident, which occurred around 7:15 AM PDT, involved a 900,000-gallon tank holding 'white liquor,' a corrosive chemical solution of sodium hydroxide and sodium sulfide essential for breaking down wood chips in the paper-making process. Initial reports indicated multiple injuries and fatalities, with the situation quickly escalating as the scale of the disaster became apparent.
The immediate aftermath saw a massive emergency response, with hazardous materials teams and fire departments from across the region converging on the site. Recovery efforts were severely hampered by the instability of the damaged tank and the presence of corrosive chemicals, making many areas inaccessible. As of May 29, 2026, eight deaths have been confirmed, and three workers remain missing, with officials stating there is no hope of finding additional survivors. Ten individuals, including seven employees and one firefighter, were initially hospitalized with burns and inhalation injuries.
The implosion has drawn significant scrutiny to Nippon Dynawave Packaging, a U.S. subsidiary of the Japan-based Nippon Paper Group, which acquired the Longview mill from Weyerhaeuser in 2016. The facility, employing approximately 1,000 people, has a documented history of environmental and safety violations. Prior incidents include a large wood chip pile fire in July 2023 that impacted air quality in the region and another fire in 2025. The company had also been cited for pollution violations and for moving equipment before an investigation into an employee injury could be completed.
Consequences of the implosion extend beyond human casualties. Tens of thousands of gallons of white liquor escaped, initially spilling into the storm drain system and later contaminating the Columbia River, with dead carp observed in local waterways. While Longview's drinking water supply was confirmed safe, the environmental impact is under assessment by the Washington State Department of Ecology and the U.S. Environmental Protection Agency.
Currently, as of May 29, 2026, the mill remains largely shut down, with only critical infrastructure operating with minimal staffing. The company has made arrangements to continue paying non-working employees. Both the U.S. Chemical Safety and Hazard Investigation Board (CSB) and the Washington Department of Labor & Industries have launched investigations to determine the root cause of the implosion and prevent future tragedies. The damaged tank is still unstable and leaking, posing ongoing challenges for recovery crews who have managed to recover six of the nine initially missing bodies.
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