Firefighters in southern California have successfully eliminated the threat of an explosion from a damaged chemical tank, Orange County fire officials confirmed on Monday. The tank, containing methyl methacrylate, had overheated and cracked over the weekend, prompting the evacuation of approximately 50,000 residents in Garden Grove and surrounding areas.
Overnight operations allowed crews to monitor the tank's temperature and verify that pressure had been released through the crack. Division Chief Craig Covey described the results as "incredibly positive news," noting that temperatures inside the tank had dropped and the risk of explosion had been significantly reduced.
The tank, located at GKN Aerospace Transparency Systems, holds between 6,000 and 7,000 gallons of methyl methacrylate, a chemical used in plastic manufacturing. The interior temperature had reached 100°F (37.7°C) on Sunday, but cooling efforts—including repeated spraying with water—helped stabilise conditions.
President Donald Trump approved a federal emergency declaration following a request from California Governor Gavin Newsom, making federal assistance available through the Federal Emergency Management Agency (FEMA). Air monitoring tests found pollution levels within normal limits, and containment barriers were set up to prevent any chemical spills from reaching storm drains or waterways.
Drone surveillance conducted temperature checks every ten minutes to watch for spikes, while crews avoided daytime operations due to the heat. Experts noted that the crack in the tank acted like a pressure release valve, reducing the likelihood of an explosion, but cautioned that the chemical remained reactive until it cooled to ambient levels of around 60–70°F (15.6–21.1°C).
Evacuation shelters remained open, with some residents sleeping in cars or on mats at a local high school. The nearby Disneyland theme parks in Anaheim were not under evacuation orders, though park officials said they were monitoring the situation.
