California officials declared a state of emergency on Saturday after a dangerous chemical emergency near Disneyland forced nearly 40,000 residents to evacuate parts of Orange County amid fears that a massive industrial tank could rupture or explode.
The crisis began Thursday afternoon at the GKN Aerospace facility on Western Avenue in Garden Grove, California, after crews discovered a leak involving methyl methacrylate (MMA), a highly flammable and toxic industrial chemical used in plastics manufacturing. According to emergency officials, the leak originated from a 34,000-gallon storage vat, triggering a large hazardous materials response and immediate evacuation orders in nearby neighborhoods.
Authorities initially believed the situation could be stabilized, but conditions rapidly worsened by Friday morning. Emergency teams confirmed that a faulty valve and an uncontrollable chemical reaction inside the tank had created what experts described as a âthermal runawayâ situation â a dangerous chain reaction that could end in a catastrophic spill or explosion.
Officials Warned of Explosion Risk Near Disneyland Area
Orange County Fire Authority Division Chief Craig Covey warned that the unstable tank still contained approximately 6,000 to 7,000 gallons of MMA and could fail in two different ways. Officials said the tank could rupture and release toxic chemicals into surrounding areas or explode violently enough to affect nearby fuel and chemical tanks at the facility.
The evacuation zone expanded across parts of Garden Grove, Anaheim, Buena Park, Stanton, Cypress and Westminster. Disneyland Resort sits inside Anaheim, only a short distance from the emergency area, placing one of Californiaâs busiest tourist destinations within the broader impact zone.
Firefighters spent hours spraying water over the tank in an effort to cool the chemical reaction and slow pressure buildup. Hazardous materials experts explained that cooling operations were designed to buy time while crews assessed whether the tank could be safely stabilized. However, by Saturday morning officials admitted the cooling process was not lowering temperatures as effectively as originally hoped.
The Orange County Fire Authority continues to issue emergency updates while residents remain under evacuation orders.
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Health Concerns Grow as Residents Remain Displaced
Health officials warned that short-term exposure to MMA vapors can cause irritation to the lungs, eyes and nasal passages, along with nausea, dizziness and breathing difficulties. At higher concentrations, exposure may require hospitalization.
The emergency also disrupted schools, businesses and hotels around the Disneyland area as displaced residents searched for temporary shelter. Some nearby hotels offered reduced emergency room rates to evacuees during the crisis.
Industrial chemical emergencies have increasingly raised public safety concerns worldwide. Swikblog recently reported on the Brisbane ammonia leak that forced hundreds of workers to evacuate, highlighting how rapidly hazardous material incidents can escalate near populated areas.
As of the latest official updates, the unstable tank remains under active monitoring while emergency crews continue cooling operations. Authorities are urging residents to follow evacuation guidance, monitor local alerts and avoid restricted zones until the danger has fully passed.
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