At least one worker died and nine others are missing after a chemical treatment tank ruptured at a Washington state paper mill [1].
The incident highlights the extreme risks associated with the storage of hazardous industrial chemicals and the potential for catastrophic equipment failure in pulp and paper processing.
The rupture occurred on May 26, 2026, at the Nippon Dynawave Packaging Co. mill located near Longview in southwestern Washington [2, 3]. A large tank containing approximately 900,000 gallons [4] of a hazardous substance known as "white liquor" failed, resulting in an implosion and the release of the chemical liquid [3, 5].
Emergency crews responded to the site to locate missing personnel and contain the spill. While some reports indicate at least one fatality [1], other reports from CBS19 said multiple deaths occurred during the implosion [6]. Nine workers remain missing [1].
White liquor is a caustic solution used in the pulping process to dissolve lignin from wood chips. The failure of such a massive vessel can cause significant structural damage to surrounding facilities, and it poses immediate chemical burn risks to workers in the vicinity.
Authorities said they are investigating the cause of the tank failure to determine if the rupture was caused by mechanical fatigue, pressure imbalances, or other operational errors [3, 5]. The site remains under the control of emergency responders as search operations continue for the nine missing employees [1].
“At least one worker died and nine others are missing”
This disaster underscores the critical importance of containment integrity for high-volume hazardous chemicals. The scale of the rupture—involving nearly a million gallons of caustic material—suggests a systemic failure that may prompt wider safety audits across the pulp and paper industry to prevent similar implosions.
