Garden Grove chemical tank emergency ends as evacuation orders lifted

Orange County fire officials lifted all evacuation orders Tuesday evening connected to a chemical tank emergency at GKN Aerospace in Garden Grove, declaring no leak, explosion or fire threat — ending five days of disruption for roughly 50,000 displaced residents.

The episode — triggered by simultaneous failures in both the cooling and safety valve systems at an industrial facility near homes and schools — has already prompted class action lawsuits against GKN Aerospace and raised fresh questions about chemical storage oversight in densely populated Orange County.

The crisis began late Thursday when a cooling system on a storage tank holding 6,500 gallons of methyl methacrylate failed at the GKN Aerospace facility in Garden Grove, Voice of OC reported. Safety valves on the 35,000-gallon tank also failed, causing dangerous pressure to build inside. Authorities ordered evacuations across Garden Grove, Stanton and Westminster, ultimately displacing about 50,000 residents.

Orange County Fire Authority Interim Chief TJ McGovern laid out the path to ending the emergency at a community forum at Cal State Fullerton. "Once we know that temperature is stabilized, we will be taking the fire risk off the table. When we take the fire risk off the table, that affects our evacuation zones. If there's no fire risk, our evacuation zones are going to shrink. When we shrink those, we start repopulation. Yesterday, you saw a massive repopulation," McGovern said.

Firefighters responded by switching off the tank's own cooling systems and allowing the chemical to stabilize naturally, then monitoring temperatures until conditions cleared. The Orange County Fire Authority announced Tuesday evening on X: "No chemical leak. No threat of explosion. No threat of fire. No risk to the public."

Shortly after, the authority issued a final all-clear — "All evacuation orders related to the Garden Grove hazardous materials incident have been lifted," according to OCFA on X. The roughly 16,000 residents still under orders at that point were cleared to return home.

Congressman Derek Tran issued a statement underlining the ongoing toll on affected families. "While the immediate danger to public health and safety has been lifted, residents are still left to pick up the pieces of the chaos and disruption caused by the hazmat incident in Garden Grove. Our community is rightfully angry, and I will continue working around the clock to demand accountability from all responsible actors," Tran said.

GKN Aerospace declined multiple requests for comment but issued a public apology. Class action lawsuits against the company are already underway.

OCFA Capt. Greg Barta told the authority's Tuesday morning update: "We want to get you home as soon as possible." By that evening, the last of the roughly 50,000 displaced residents were cleared to do exactly that.