California authorities evacuate 40,000 amid chemical tank crisis in Garden Grove
Orange County officials issue mandatory evacuation orders for Garden Grove residents following a leak at an aerospace facility, with containment efforts underway to prevent environmental contamination.
Authorities in southern California ordered the evacuation of approximately 40,000 residents in Garden Grove, Orange County, on Friday, 23 May 2026, following a leak from a storage tank containing methyl methacrylate. The hazardous chemical, used in plastic manufacturing, is volatile and flammable, posing significant risks of explosion and toxic fume dispersion. The incident, initially reported on Thursday, has prompted a large-scale emergency response in the area southeast of Los Angeles.
Incident Commander Craig Covey outlined the critical nature of the situation, stating that emergency crews were preparing for two primary outcomes: a total spill of the 7,000-gallon (26,000-litre) volume into the surrounding area or a thermal runaway event that could cause the tank to explode. Covey noted that an explosion would likely trigger a chain reaction, affecting adjacent tanks containing fuel or other chemicals. He described a controlled spill as the "best-case scenario" compared to the catastrophic potential of a rupture.
Firefighters successfully cooled the tank to 61 degrees Celsius, a significant improvement from its previous state, with 50 degrees Celsius identified as the chemical's optimal temperature. Covey confirmed that these cooling efforts were succeeding and stated that crews were working to develop additional containment options beyond the initial two scenarios. The tank, which has a total capacity of 34,000 gallons, was located at a GKN Aerospace facility.
Garden Grove Police Chief Amir El-Farra reported that while the evacuation order affected tens of thousands of people, several thousand residents refused to leave their homes. Health officer Regina Chinsio Kwong advised the public to alert authorities if they detected a "fruity and heavy smell," although she cautioned that the presence of the odour did not necessarily indicate exposure levels that would cause immediate symptoms. She emphasised that remaining outside the designated exclusion zone was the primary safety measure.
Responders are installing containment barriers to prevent spilled material from reaching storm drains or river channels that flow into the ocean. The US Environmental Protection Agency notes that methyl methacrylate can irritate the skin, eyes, and mucous membranes, and may cause respiratory and neurological symptoms following acute exposure. No injuries have been reported, and the cause of the leak remains unknown.
