A military aerospace powerhouse at the brink of a potential chemical catastrophe in Southern California previously shelled out close to $910,000 to settle environmental infractions at the very site where authorities now fear an overheated tank could erupt as early as Monday morning.
GKN Aerospace, a prominent supplier known for its jet engines, landing gear, and aircraft components for both commercial and military aviation, agreed to the settlement with the South Coast Air Quality Management District in January 2025. This was due to violations concerning permits, incomplete emissions records, and nitrogen oxide issues linked to its Garden Grove facility, as reported by the LA Times.
These past breaches have come back into the spotlight as emergency teams race against the clock to manage a deteriorating storage tank containing approximately 7,000 gallons of methyl methacrylate. This substance, known for its high toxicity and flammability, is commonly used in the production of plastics.
Authorities have issued warnings that by Monday morning, around 10 a.m., the tank might hit a perilous temperature of 140F. This is the critical point where the chemical could begin generating more heat than the firefighters can mitigate, thereby substantially heightening the chances of a devastating rupture, release of toxic vapors, or even an explosion.
The emergency first unfolded on Thursday morning when the chemical tank began overheating and emitting vapors at the aerospace manufacturing site. By Friday, Orange County fire officials noted a deterioration in the situation due to a malfunction in the tank’s pressure-release valve, which thwarted efforts to halt the hazardous reaction.
By Friday, Orange County fire officials said the situation had worsened after a malfunction involving the tank’s pressure-release valve prevented crews from stopping the dangerous reaction.
Evacuation orders rapidly expanded throughout six Orange County cities — Garden Grove, Anaheim, Buena Park, Cypress, Stanton and Westminster — displacing an estimated 40,000 to 50,000 residents.
As conditions inside the tank deteriorated Saturday, California Gov. Gavin Newsom declared a state of emergency to unlock additional state resources and shelter locations.
Emergency officials described the incident as an extremely dangerous “thermal runaway” event, where the chemical generates its own uncontrollable heat inside the pressurized tank.
Under the current response plan, hazmat teams are continuing to monitor temperatures while cooling the container. Officials have acknowledged there is a point where crews may be forced to pull back entirely, leaving the tank to either rupture or explode.
“This is a very dangerous situation,” Garden Grove Mayor Stephanie Klopfenstein said Saturday while urging residents still ignoring evacuation orders to leave immediately.
According to the South Coast AQMD, inspectors uncovered multiple violations during a November 2020 inspection at the GKN facility, including absent records involving volatile organic compound emissions and permitting problems.
The agency later requested additional operational records and ultimately issued a notice of violation in April 2021.
Regulators said they continued working with GKN in the years afterward to address the permitting concerns and obtain additional documentation.
GKN Aerospace did not immediately respond to questions about the prior settlement as the chemical emergency escalated over the weekend.
