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Garden Grove chemical tank update: Cleanup efforts to begin and legal claims mount

Last updated: Friday, May 29, 2026 6:37PM GMT
Cleanup phase begins after chemical tank crisis in Garden Grove

GARDEN GROVE, Calif. (KABC) -- There is no longer a threat of explosion, fire or chemical leak for a damaged tank at the GKN Aerospace facility in Garden Grove, the Orange County Fire Authority announced on Tuesday night.

All evacuation orders were officially lifted at 7:30 p.m., allowing the final 16,000 evacuated Orange County residents to return home. Initially, 50,000 residents were evacuated from their homes last week.

A tank carrying 6,500 gallons of the highly toxic chemical methyl methacrylate (MMA) became unstable last week, causing the tank to heat up uncontrollably. For a few days, officials said the tank would either explode or spill out, and either outcome was inevitable.

Eventually, the tank cracked, allowing the pressure to release and eliminating the threat of a BLEVE, which stands for Boiling Liquid Expanding Vapor Explosion.

Then, crews worked a risky mission to confirm that the pressure had been released and to remove weather insulation from the outside of the tank to help the water be more efficient at cooling the temperature down.

Still, a threat remained for a fire or a small explosion. Firefighters continued to try to get the tank to stabilize and were eventually able to stop dousing it with water. On Tuesday afternoon, crews were seen freely walking around the tank and climbing on top of it.

By Tuesday night, OCFA declared that there was no longer a risk to surrounding residents and all evacuation orders were lifted. No injuries were reported.

The investigation into what caused the material in the tank to overheat is ongoing. Residents have already filed a class action lawsuit against GKN Aerospace.

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May 24, 2026, 6:29 PM GMT

Crews find crack in tank, gain positive intel that could shift response strategy

Firefighters gathered "positive intel" during an overnight operation that could shift the response strategy for the chemical tank crisis in Garden Grove, officials said during a Sunday morning update posted on social media.

A specialized team of subject matter experts developed a plan to get eyes on the tank. During the operation, firefighters were able to visually examine the tank and discovered a potential crack, which may be helping relieve pressure.

"During that operation, our firefighters went in, and they were able to visualize the tank," said Interim Orange County Fire Authority Chief TJ McGovern. "What they found was a potential crack in the tank, which could potentially be relieving some of the pressure in there."

He said officials are now reviewing and confirming that information, which could play a key role in determining how crews move forward.

"We took that information, we got data on it, and right now this morning, what we're doing is we are vetting and validating that information," McGovern said. "With this new information, it could change our trajectory and our strategy to this event."

McGovern said the operation was successful, although the situation is not yet resolved.

"We're not there yet, but this was a step in a right direction, and there's going to be a lot more coming shortly," he said.

"Your protection, your life safety is our paramount responsibility right now," McGovern added. "We know you're out of your homes, we want to get you back, but we cannot do that until it's deemed safe."

KABC logo
May 25, 2026, 1:09 AM GMT

Resources for residents evacuated due to chemical tank crisis

About 50,000 residents are under mandatory evacuation orders due to the ongoing chemical tank crisis in Garden Grove.

Here is a list of resources for evacuees:

  • Garden Grove Emergency Hotline: 714-741-5444
  • O.C. Public Information Hotline: 714-628-7085
  • Disaster Distress Helpline: Call or text 1-800-985-5990

May 24, 2026, 12:51 PM GMT

List of school closures in evacuation zone

The following schools will be closed until further notice.

Garden Grove School District:

  • Barker Elementary School
  • Bryant
  • Carver
  • Enders Elementary School
  • Garden Park
  • Lawrence Elementary School
  • Wakeham Elementary School
  • Patton Elementary School
  • Bell Intermediate School
  • Alamitos Intermediate
  • Pacifica High School
  • Rancho Alamitos High School
  • Skylark Preschool
  • Maintenance and Operations Facility
  • Lampson Bus Yard

Magnolia School District:

  • Esther L. Walter School (students relocated to Jonas E. Salk)
  • Robert M. Pyles STEM Academy (students relocated to Mattie Lou Maxwell Elementary)

Savanna School District:

  • Hansen Elementary (students were split between Holder School and Twila Reid Elementary School)

Westminster School District:

  • Finley, Johnson, and Sequoia Schools relocated to Stacy Middle School
  • Anderson, Fryberger, Meairs, and Schmitt relocated to Warner Middle School

Cypress School District:

  • Frank Vessels Elementary
  • Juliet Morris Elementary

City News Service, Inc. contributed to this report.

ABCNews logo
May 24, 2026, 12:45 PM GMT

Some 50,000 residents under evacuation orders

Mandatory evacuations have expanded for some 50,000 residents in the Garden Grove area, according to an internal briefing memo reviewed by ABC News.

There are multiple public facilities nearby -- including schools, hospitals, nursing homes, fire and law enforcement stations -- critical infrastructure, and essential services, all currently subject to mandatory evacuation and ongoing response operations.

Multiple roads have also been closed off in the evacuation zone. Evacuation centers have been established across Garden Grove, Cypress, Stanton City Hall, Anaheim, and Buena Park, the memo said.

ABC News contributed to this report.