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Deadly Chemical Tank Implosion at Washington Paper Mill Leaves 11 Feared Dead
A catastrophic chemical tank implosion at a paper mill in Longview, Washington, has left at least two people confirmed dead and nine others missing and presumed dead, marking one of the deadliest industrial accidents in the state's modern history. The disaster occurred on the morning of May 26, 2026, at the Nippon Dynawave Packaging facility, where a massive 900,000-gallon tank containing a highly caustic chemical solution known as white liquor suddenly collapsed.
Authorities have transitioned from rescue to recovery operations, confirming there is no hope of finding survivors among the missing workers. Eight additional employees and one firefighter were injured, with some suffering severe chemical burns and inhalation trauma. The US Chemical Safety Board investigation is now underway to determine the root cause of the failure.
What Happened at the Nippon Dynawave Packaging Plant?
Just before 7:15 a.m. PDT on Tuesday, a circular steel tank containing approximately 900,000 gallons of white liquor — a corrosive mixture of sodium hydroxide and sodium sulfide used in the Kraft pulping process — buckled and imploded at the plant located about 45 minutes north of Portland, Oregon. The force of the rupture released over 500,000 gallons of the scalding, caustic liquid across the facility, causing immediate trauma, chemical burns, and toxic inhalation injuries to workers in the vicinity.
City of Longview officials advised residents to avoid nearby dikes and ditches between Washington Way and Prudential Boulevard as the chemical spread into local drainage systems. Dead carp were discovered along the banks of the Columbia River, which received some contamination, though authorities stated there is no immediate threat to public drinking water or air quality.
Victims and Rescue Efforts
The confirmed deceased include two plant employees whose bodies were recovered in the immediate aftermath. Nine additional workers remain unaccounted for, and Governor Bob Ferguson has confirmed the search is now a recovery mission. Eight injured workers were transported to area hospitals, along with one firefighter who was hurt during the initial response.
First responders in hazmat suits worked methodically through the debris field, but operations were temporarily halted when structural engineers deemed the remaining tank hull unstable — approximately 90,000 gallons of white liquor remained inside the damaged vessel. The Washington National Guard Civil Support Team and Homeland Response Force were mobilized to assist with decontamination, air quality monitoring, and recovery.
Congresswoman Marie Gluesenkamp Perez, who represents the district, described the scene as one of “undenkbare horrorbeelden” (unimaginable horror images) for rescue workers, and demanded a thorough investigation and accountability. Governor Ferguson called it “likely the worst industrial tragedy in Washington state in recent decades.”
What Is White Liquor and Why Is It Dangerous?
White liquor is a highly alkaline chemical solution primarily composed of sodium hydroxide (caustic soda) and sodium sulfide. It is used at high temperatures — typically around 170°C (338°F) — in the Kraft pulping process to dissolve lignin and separate wood fibers for paper production. The liquid is extremely corrosive: skin contact causes immediate chemical burns, and inhalation of vapors can lead to severe respiratory damage. The sheer volume released in this incident — over half a million gallons — created an extraordinarily hazardous environment for anyone in the blast zone.
Company Safety Record Under Scrutiny
Nippon Dynawave Packaging, a subsidiary of Japan's Nippon Paper Group, has faced prior safety violations. State records show the company was fined a total of $3,400 for three separate health and safety infractions since 2021, though officials state those citations were unrelated to the specific tank that failed. The facility also experienced a wood chip fire in 2023. The paper mill safety regulations in the US are now facing renewed scrutiny in the wake of this tragedy.
The US Chemical Safety Board (CSB) has launched a full investigation, with teams on site collecting evidence, interviewing witnesses, and examining maintenance records. The exact cause of the implosion — whether due to corrosion, structural fatigue, overpressure, or another factor — remains unknown.
Environmental Impact and Community Response
The spill contaminated local drainage ditches and reached the Columbia River, where dead fish were observed. However, state ecology officials said the contamination was localized and posed no risk to public water supplies. Air quality monitoring stations around the plant detected no dangerous levels of airborne chemicals, and no evacuation orders were issued for nearby neighborhoods.
Longview, a city of approximately 38,000 residents, has a long industrial history rooted in timber and paper production. The Nippon Dynawave mill employs around 1,000 workers and is a major economic engine for the region. Community members have gathered at makeshift memorials near the plant gates, leaving flowers and messages for the victims. The industrial disaster compensation and legal rights for affected families are expected to become a major issue in the coming weeks.
FAQ: Washington Chemical Tank Implosion
How many people died in the Longview tank implosion?
Two deaths have been confirmed, and nine workers are missing and presumed dead, bringing the likely total to 11 fatalities. Eight workers and one firefighter were also injured.
What caused the chemical tank to implode?
The exact cause is under investigation by the US Chemical Safety Board. Potential factors include corrosion, structural fatigue, or a pressure imbalance inside the tank. The tank held white liquor at high temperature.
Is the public in danger from the chemical spill?
Authorities say there is no threat to public air quality or drinking water. Some contamination entered the Columbia River, but it is localized. Residents were advised to avoid certain drainage ditches as a precaution.
What is white liquor used for?
White liquor is a caustic chemical solution used in the Kraft pulping process to break down wood chips into pulp for paper manufacturing. It contains sodium hydroxide and sodium sulfide.
Has the company faced safety violations before?
Yes, Nippon Dynawave Packaging was fined $3,400 for three health and safety violations since 2021, though officials say these were unrelated to the imploded tank. The company also had a wood chip fire in 2023.
Sources
AP News: Washington paper mill tank rupture
NPR: Chemical tank ruptures in Washington state
The Guardian: Washington paper mill implosion
Washington State Standard: State agencies respond to chemical tank implosion
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