An overheating chemical storage tank at an aerospace plastics facility in Garden Grove, California, forced the evacuation of approximately 40,000 residents across six Orange County cities on Friday.
Emergency crews raced to prevent a potential explosion as the hazard involved a storage tank holding between 6,000 and 7,000 gallons of methyl methacrylate at GKN Aerospace.
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The facility manufactures components for commercial and military aircraft.
The chemical began venting vapors into the air on Thursday after the tank overheated, prompting initial containment efforts by emergency responders.
Local authorities expanded the mandatory evacuation orders on Friday to encompass portions of Cypress, Stanton, Anaheim, Buena Park, and Westminster after overnight stabilization efforts failed to stop the chemical leak.
"This thing is going to fail, and we don't know when," said Craig Covey, Garden Grove Fire Chief.
Fire crews positioned sandbag containment barriers around the site to manage potential spills and stop the toxic material from entering storm drains, local creeks, or the Pacific Ocean.
In a later update on Friday, emergency personnel managed to stabilize the tank's temperature to allow additional time for technical planning.
"We're doing our best to figure out when or how we can prevent it," said Craig Covey.
Hazardous material teams successfully neutralized one of two damaged tanks on site before tracking the worsening condition of the remaining vessel.
No injuries or fatalities have been reported in connection with the incident, according to the Orange County Fire Authority.
"There are no reports of injuries at this time, and our priority remains the safety of our employees, responders, and the surrounding community," said a GKN Aerospace spokesperson.
The facility operates less than a mile from Disneyland's two theme parks, which remained outside the evacuation zones on Friday.
Dr. Regina Chinsio-Kwong, the county health officer, warned that inhaling the chemical vapors can trigger respiratory distress, nausea, headaches, and eye irritation.
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"We will provide verified updates as soon as more information becomes available," said a GKN Aerospace spokesperson.
Evacuated residents sought immediate shelter in neighboring municipalities as police officers conducted door-to-door checks through empty neighborhoods.
Local Vietnamese television stations translated emergency updates to reach the city's large Vietnamese-American population.
"It was shocking to me," said Danny Pham, a Garden Grove resident who lives two blocks from the facility.
Pham fled his home Friday morning after being alerted by a roommate. He took temporary shelter at a friend's restaurant while awaiting further instructions from emergency management officials.
"I didn't know how serious it would be. I never knew that a thing like this could happen," said Pham.
Other nearby residents described receiving emergency siren alerts on their mobile phones late Thursday evening before departing for safe zones outside the affected perimeter.
"They are family," said Kim Yen, a Garden Grove retiree who expressed concern for older community members who might face language barriers with English-only emergency alerts.
Yen briefly returned Friday morning to retrieve medical supplies and essential documentation from her home.
"I'm hoping they stay alert and listen to the news and the authorities. This is scary," said Yen.
Municipal leaders emphasized that the displacement of residents remains necessary until specialized teams can permanently secure the volatile storage tank.
"We understand that this is frightening," said Stephanie Klopfenstein, Garden Grove Mayor.
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"But the evacuation orders are in place for your safety," said Klopfenstein.
