Thousands of Southern California residents who spent days under evacuation orders are beginning to return home after emergency officials announced they had successfully eliminated the threat of a catastrophic explosion at an aerospace facility in Orange County.
But authorities stressed Monday that while the worst-case scenario has been avoided, the incident remains active and dangers still exist.
The emergency began Thursday after firefighters responded to a chemical vapor leak at aerospace manufacturer GKN Aerospace in Garden Grove. Officials discovered problems involving a storage tank containing nearly 7,000 gallons of methyl methacrylate, a highly flammable and toxic chemical commonly used in plastics and aerospace manufacturing.
Authorities warned early in the crisis that if the tank failed, it could trigger one of two severe outcomes: a massive spill of hazardous chemicals or a catastrophic explosion.
As concerns escalated, evacuation orders spread across portions of Garden Grove, Buena Park, Anaheim, Stanton, Westminster, and Cypress, affecting nearly 50,000 residents.
Emergency officials spent days racing to prevent disaster after learning the tank’s cooling system had failed. According to Orange County Fire Authority officials, methyl methacrylate inside the vessel is typically maintained at approximately 50 degrees, but temperatures had risen dramatically, increasing fears that pressure inside the tank could continue building.
By Saturday evening, temperatures inside the tank had reached approximately 100 degrees, according to officials.
Crews then discovered a crack in the tank Saturday night that unexpectedly altered the situation.
Orange County Fire Authority Division Chief Craig Covey said the crack allowed pressure to begin escaping from the vessel, changing the trajectory of the response effort and helping officials avoid the most dangerous outcome.
“We knew we had to come up with a plan,” Orange County Fire Authority Interim Chief TJ McGovern said during a Monday news conference, according to CBS News. “Throughout the day today, I’m happy to report the most catastrophic and worst case scenario was mitigated and resolved.”
Officials spent days flooding the area with water to cool the compromised tank and prevent temperatures from climbing further.
“We’re talking millions and millions of gallons,” Covey said Monday while describing the extensive cooling operation. Firefighters used a large-scale deluge sprinkler system along with high-capacity water monitors operating continuously around the clock.
By Monday evening, authorities said tank temperatures had gradually dropped to roughly 93 degrees and were continuing to trend downward.
Officials also announced a major reduction in evacuation zones after determining that the threat of a massive explosion had been eliminated. The evacuation footprint was reduced by approximately 65%, allowing tens of thousands of residents to return home.
Roughly 16,000 people remained under evacuation orders Monday evening.
Despite the positive developments, emergency crews warned the situation had not yet been fully resolved.
“It’s not over yet,” McGovern said. “We still have work to do.”
Officials said a smaller explosion or tank rupture capable of releasing toxic chemicals into the area remains possible.
Firefighters planned another overnight operation Monday to continue testing pressure levels and monitor conditions inside the tank before deciding whether additional evacuation orders could be lifted.
Environmental officials also sought to reassure residents concerned about contamination risks.
According to the U.S. Environmental Protection Agency, continuous air-quality monitoring conducted throughout the emergency had not detected dangerous exceedances.
Orange County Health Care Agency officials also told returning residents there was no evidence of contamination requiring people to wash down homes, patios, or outdoor furniture.
Meanwhile, the incident is now drawing legal scrutiny. Orange County District Attorney Todd Spitzer has launched an investigation into GKN Aerospace and has called for whistleblowers with information about operations at the facility to come forward.
California Governor Gavin Newsom also declared a state of emergency and requested a federal emergency declaration, which President Donald Trump approved Monday.
For thousands of Orange County residents, officials said the immediate nightmare scenario appears to have been avoided — but emergency responders remain on scene as they work to ensure the crisis is fully contained.
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