GARDEN GROVE, Calif. — A dangerous chemical leak at a Southern California aerospace facility has entered a new phase after officials said the threat of a massive explosion has been ruled out, even as authorities warned the crisis is still not fully over.
Orange County Fire Authority leaders said the worst-case scenario — a BLEVE, or boiling liquid expanding vapor explosion — is no longer a concern at the GKN Aerospace site in Garden Grove after crews spent hours monitoring and testing the damaged tank overnight. Officials said the pressure inside the tank had been released and the most catastrophic danger had been eliminated.
“We are happy to report that the threat of a BLEVE is now off the table,” OCFA Interim Chief TJ McGovern said in an incident update. The agency later clarified, however, that while a massive blast was no longer expected, a smaller fire or explosion could still occur because combustible material remains in the tank.
The incident began when crews responded to a suspected chemical leak at the aerospace plant, triggering large-scale evacuations and widespread concern across Orange County. More than 50,000 people were initially under evacuation orders, though officials later reduced the evacuation zone as the immediate explosion risk decreased.
Even with the major hazard downgraded, emergency crews have continued to monitor conditions at the site around the clock. The Environmental Protection Agency said it deployed stationary air monitors beginning Friday and that specialized equipment did not detect gas leaking from the tank. Officials also said no injuries have been reported.
The cause of the leak remains under investigation. Authorities have not said when the remaining evacuation restrictions, if any, will be fully lifted, and they continue to assess the condition of the tank and the surrounding area.
Public health and fire officials have also worked to reassure nearby communities that the immediate threat has lessened. Los Angeles County officials said current wind conditions did not pose a threat to Los Angeles County communities, and the Los Angeles Fire Department said the city itself was not at risk.
Still, residents displaced by the emergency have been waiting for final clearance to return home. The latest update marked a significant turning point in a crisis that had raised fears of a major industrial disaster in one of Orange County’s busiest urban areas.
Emergency crews remained at the site Monday, continuing safety checks and atmospheric monitoring while officials prepared for the next stage of the response.