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America May 25, 2026 7 mins read

Firefighters Battle Toxic Chemical Leak:Mass Evacuations in Orange County

America ı By Jackie Allen

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Toxic Chemical Leak

California Firefighters continued an intense round-the-clock emergency response operation in Orange County after a dangerous toxic chemical leak at a manufacturing facility triggered evacuation orders. More than 50,000 residents were notified raising fears of a catastrophic explosion.

Officials said crews worked overnight Sunday into Monday to assess pressure levels inside a cracked storage tank containing thousands of gallons of methyl methacrylate, a highly flammable industrial chemical capable of triggering what experts describe as a worst-case “BLEVE” event — a Boiling Liquid Expanding Vapor Explosion.

The crisis, centered at the GKN Aerospace facility in Garden Grove, has now entered its fourth day, with firefighters, hazmat teams, engineers, and state emergency officials scrambling to prevent disaster.

Operation Focuses on Preventing Explosion at Toxic Chemical Leak Site

Officials with the Orange County Fire Authority said the overnight mission was designed to determine whether pressure inside the damaged tank had been successfully released or whether dangerous vapor buildup remained trapped inside.

Orange County Fire Authority Interim Chief TJ McGovern warned Sunday night that the threat of a BLEVE explosion had not yet been eliminated.

“The BLEVE threat is the worst-case catastrophic event that we've been talking about,” McGovern said. “We are not there yet.”

According to fire officials, crews discovered a crack in the tank Saturday night. Initially, there was confusion about whether multiple cracks had formed. Authorities later clarified that there is one confirmed structural crack, while peeling weather stripping caused by continuous water streams created the appearance of additional damage.

Officials explained that firefighters have been cooling the tank continuously with hose streams in an effort to reduce internal temperatures and stabilize the volatile chemical inside.

What Is a BLEVE Explosion?

A BLEVE, or Boiling Liquid Expanding Vapor Explosion, occurs when a pressurized container holding flammable liquid overheats and ruptures violently.

The danger facing firefighters in Garden Grove is significant because methyl methacrylate generates heat as it destabilizes. If pressure inside the tank rises beyond containment limits, officials fear it could ignite nearby chemical or fuel tanks and create a chain reaction.

Experts said the tank currently holds an estimated 6,000 to 7,000 gallons of the substance.

Officials reported that the internal temperature of the tank had climbed above 100 degrees Fahrenheit — more than double the temperature considered stable for the chemical.

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Jackie Allen
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Jackie Allen

Jackie is a freelance journalist and technology geek. She worked as a telecom project director for AT&T and BellSouth. Before joining the USA Herald she has written books, articles, blogs and whitepapers. Her clients include Samsung and other technology companies.

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