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White Liquor Tank Implodes at Nippon Dynawave Mill in Longview, Causing Fatalities

White Liquor Tank Implodes at Nippon Dynawave Mill in Longview, Causing Fatalities
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Multiple people were killed and at least 10 injured Tuesday morning when a massive tank of caustic “white liquor” imploded at the Nippon Dynawave Packaging paper and pulp mill in Longview, Washington, in one of the region’s worst industrial accidents in years komonews +1. Officials said the number of dead and missing workers was still being confirmed as rescue operations shifted into recovery by late afternoon fox13seattle +1.

The incident occurred around 7:15–7:20 a.m. local time, when an 80,000‑gallon tank holding white liquor — a highly corrosive mix used in the kraft pulping process — suddenly ruptured, sending a blast through the industrial complex and dousing workers with chemicals king5 +1. One person was confirmed dead, at least nine others were hospitalized with chemical burns and traumatic injuries, and nine employees were still unaccounted for in early evening, according to local officials and hospital reports king5. Hazmat teams from multiple agencies converged on the site along the Columbia River as authorities described a “mass casualty” scene komonews +1.

What Happened Inside the Longview Mill?

Fire officials initially described a “major chemical explosion” before clarifying that the tank had imploded or ruptured, rather than detonated in a traditional blast komonews +1. The vessel, reportedly about 60% full at the time, contained white liquor, an alkaline solution of sodium hydroxide and sodium sulfide that can cause severe, deep chemical burns on contact and serious eye and respiratory damage if inhaled as mist fox13seattle +2.

Victims were rushed to PeaceHealth St. John Medical Center in Longview, PeaceHealth Southwest in Vancouver, and burn centers in Portland for treatment of extensive burns and other injuries wbaltv +1. One firefighter was among the injured fox13seattle. “We have confirmed that there are fatalities but the exact number is undetermined,” Cowlitz 2 Fire & Rescue Chief Scott Goldstein said, as crews methodically searched the twisted metal and chemical-contaminated debris for missing workers fox13seattle.

Authorities shut off pumps on the mill’s containment diking system to prevent contaminated water from discharging into the Columbia River and deployed state spill responders to watch for harmed wildlife king5. The Washington Department of Ecology said air monitoring and containment steps meant there were “no immediate health concerns” for the surrounding community, though residents were urged to avoid the industrial corridor king5.

A Tragic Flashpoint in a Mill With a Troubled Record

While investigators cautioned that the cause of the tank failure remained unknown, the disaster immediately focused attention on Nippon Dynawave’s safety and environmental track record. In recent years the Longview complex has logged multiple fires, including a large 2023 wood‑chip blaze that fouled local air and a 2025 warehouse fire on mill property king5 +1.

Regulatory filings cited by state and local outlets showed a pattern of federal and state violations: the U.S. Environmental Protection Agency documented repeated periods of “significant noncompliance” with water discharge limits, including a month where effluent levels reportedly spiked to 770% of permitted levels, with roughly $16,000 in fines levied across several years king5 +1. Washington’s Department of Labor & Industries had two open inspections at the facility at the time of the implosion, linked to anonymous safety complaints about equipment and infrastructure, along with earlier citations for respiratory protection and an equipment accident — though officials stressed those cases had not been tied to Tuesday’s tank failure wsoctv.

Senator Patty Murray called the implosion “an absolute tragedy” and pledged federal support for the community and first responders bizjournals. Labor & Industries said its formal workplace-safety investigation, which could take up to six months, would begin once recovery operations conclude wsoctv.

The Bigger Picture

The Longview implosion underscored the hazards of large‑scale chemical storage in an industry that routinely handles caustic liquors at high temperatures and pressures. With fatalities still being counted and the cause not yet identified, the disaster is likely to intensify scrutiny of how mills manage aging infrastructure, corrosive chemicals and enforcement histories that show repeated lapses punished with relatively small fines. For the Longview community, the questions now extend beyond what failed on Tuesday morning to whether the regulatory system around one of its largest employers failed as well.