Chemical Leak Prompts Large-Scale Evacuations in Garden Grove

Tens of thousands of residents in Garden Grove, California, were ordered to evacuate on Friday due to a leaking chemical tank that posed serious risks of either spilling or exploding. This situation developed in an Orange County suburb, not far from the Los Angeles County line.

The tank, which contains methyl methacrylate (MMA)—a flammable substance commonly used in aerospace manufacturing—has been experiencing overheating issues and venting since Thursday evening.

“The tank is undergoing thermal runaway, which is why we made the decision to evacuate,” said Craig Covey, a division chief at the Orange County Fire Authority. He stressed the importance of moving people to safety, stating, “It’s crucial to get everyone out of their homes.”

Evacuations have affected six cities in the area, including not only Garden Grove but also Cypress, Stanton, Anaheim, Buena Park, and Westminster.

The troubled tank is part of a facility owned by GKN Aerospace, a UK-based company that manufactures components for both military and civilian aircraft, supplying major clients like Airbus and Boeing.

By Friday, the tank was deemed to be “in crisis,” holding an estimated 6,000 to 7,000 gallons of MMA.

“We’re down to two potential outcomes: either the tank spills its contents onto the parking lot, or it undergoes thermal runaway and explodes, potentially impacting nearby tanks with fuel or chemicals,” Covey explained.

Short-term exposure to MMA can lead to respiratory issues, including irritation and dizziness, and higher exposure levels might cause severe health problems, highlighted Orange County health officer Dr. Regina Chinsio-Kwong.

Authorities noted that MMA is denser than air, meaning if it leaks, it could settle in lower-lying areas around the tank.

“Currently, there have been no reported injuries. Our main priority is the safety of all involved—employees, responders, and locals. We are continuously collaborating with emergency services to manage the situation effectively,” remarked a spokesperson from GKN Aerospace.

As of Friday afternoon, there have been no toxic air impacts reported, but officials are keeping a close watch on developments.

In response to the crisis, Rep. Derek Tran expressed the need for GKN Aerospace to take responsibility for the ongoing panic in the community. He emphasized that ensuring public safety is the top priority.