A damaged chemical tank in Southern California has caused significant concern after it cracked over the weekend, prompting the evacuation of approximately 50,000 residents. Authorities are working diligently to mitigate the risks associated with a potential explosion, which could pose a serious threat to public safety.
The incident began Thursday when the tank, located in Garden Grove, overheated and began venting vapors, leading local and state officials to scramble in an effort to prevent a catastrophic scenario. Fortunately, no injuries have been reported thus far.
Firefighters have been actively involved, spraying the tank with water to cool the chemicals inside. By Sunday, the tank’s interior temperature had risen to 100 degrees Fahrenheit (37.7 degrees Celsius), an increase of 10 degrees since Saturday, as reported by Democratic state Senator Tom Umberg.
During the weekend, fire officials discovered that the tank had cracked, which, while alarming, reduced the likelihood of a devastating explosion. Orange County Fire Authority Captain Wayhowe Huang stated that it did not appear any of the highly volatile chemicals had leaked.
“There’s still the danger of a possible explosion,” Huang cautioned, underlining the seriousness of the situation.
Efforts to Prevent Disaster
In response to the escalating situation, Governor Gavin Newsom declared a state of emergency on Saturday. He also requested President Donald Trump to issue an emergency declaration to provide additional federal support to local and state officials.
The tank in question, which belongs to GKN Aerospace Transparency Systems, contains between 6,000 and 7,000 gallons (22,700 to 26,500 liters) of methyl methacrylate, a chemical used in the production of plastic parts for both commercial and military aircraft.
Environmental officials have reported that air quality monitoring tests around the evacuation zone remain within normal limits. Specialized equipment has been deployed to ensure that no gas is released into the environment.
Firefighters’ primary goal is to cool the chemical in the tank to prevent a leak or explosion. Using drones, they are monitoring temperatures every ten minutes to detect any spikes. Additionally, containment barriers have been set up to prevent any potential chemical spills from reaching storm drains or nearby water bodies, according to Orange County Fire Authority division chief Craig Covey.
Understanding the Risks of Methyl Methacrylate
As the interior temperature of the tank rises, methyl methacrylate may convert from liquid to gas, increasing pressure inside the tank. Purdue University engineering professor Andrew Whelton explained that the crack in the tank could allow for the release of product or pressure, thereby reducing the risk of explosion.
“Think of a soda can. If you leave it in a hot car, it can explode,” Whelton noted. “But if you put a hole in the can, the product is released, and the can itself doesn’t explode.”
However, firefighters remain hesitant to create a hole in the tank due to concerns that a spark could ignite the volatile gas. An explosion could result in chemical spread over a wide area, causing severe hazards and sending shrapnel flying.
Community Impact and Health Concerns
Aerial photographs taken by the Associated Press showed empty streets in the vicinity of the incident, with several evacuation shelters set up for displaced residents. At a local high school in neighboring La Palma, individuals sought refuge, sleeping in cars or on mats and sleeping bags laid out on the asphalt.
Despite the evacuation, nearby Disneyland parks remained open, with officials monitoring the situation closely.
Exposure to methyl methacrylate can result in respiratory issues, neurological problems, and irritation of the skin, eyes, and throat, according to safety fact sheets. Whelton emphasized the importance of conducting thorough air monitoring specifically for methyl methacrylate if an explosion were to occur, contrasting this with the inadequate measures taken following the 2023 train derailment in East Palestine, Ohio.
Health officials in Orange County have reassured residents that the chemical is easily detectable by smell, although it can be sensed over a broad area without necessarily posing an immediate threat.
Legal Actions and Future Implications
In light of the incident, some Garden Grove residents have initiated a class-action federal lawsuit against GKN Aerospace Transparency Systems, the company responsible for the facility housing the tank. Legal representatives for the residents argue that regardless of the outcome, the property values in the surrounding community are likely to be adversely affected.
While GKN Aerospace has not publicly commented on the lawsuit, the company has expressed regret over the situation and the inconvenience caused to residents and businesses forced to evacuate. The company stated it is “working around the clock to mitigate the risk of a leak.”
In 2025, GKN Aerospace agreed to pay more than $900,000 to state regulators to settle violations related to recordkeeping, permitting issues, and nitrogen oxide emissions, highlighting ongoing concerns regarding the company’s operational practices.
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AP journalist Ethan Swope contributed to this report from Garden Grove, California.
