A serious chemical leak at the GKN Aerospace facility in Garden Grove, California, has alarmed officials who fear it could lead to a catastrophic explosion. The site houses a 34,000-gallon tank that is currently releasing toxic chemicals into the atmosphere.
This unsettling scenario unfolded on Thursday afternoon, as the tank began venting methyl methacrylate (MMA), a highly flammable chemical vital for manufacturing acrylic plastics and aerospace materials. As a precaution, evacuations were ordered in parts of west Garden Grove, affecting residents from Western Avenue to Beach Boulevard.
In response, the Orange County Fire Authority promptly evacuated multiple surrounding buildings and shut down nearby streets. Hazmat crews were dispatched to contain the leak as smoke billowed into the air.
Officials have since indicated that the situation has grown increasingly precarious, with pressure inside the tank continuing to rise. Reports suggest there are effectively “two options left” for this tank: it either fails or explodes, as noted by ABC7.
WATCH:
“It fails” or “it blows up.”
Evacuation orders were reissued Friday for thousands of residents and schools were closed in Garden Grove due to continued concerns about a toxic chemical leaking from a large storage tank at an aerospace facility.
“There are literally two options… pic.twitter.com/g1sy2jiBZT
— ABC7 Eyewitness News (@ABC7) May 22, 2026
“There are literally two options left remaining: one, the tank fails, releasing around six to seven thousand gallons of harmful chemicals, or two, it undergoes a thermal runaway and detonates, affecting adjacent tanks filled with chemicals,” said OCFA Division Chief Craig Covey.
This alarming news has heightened fears among local residents, who had faced hours of evacuation as dangerous vapors wafted through their community. Emergency officials are reportedly concerned that should the tank suffer a violent rupture, the fallout could extend far and potentially ignite.
Aerial coverage from local stations captured the scene, showing the immense storage tank persistently venting chemical vapors while firefighters observed the unfolding crisis from a safe distance. The root cause of this hazardous reaction remains unclear, but early indications suggest that chemical mixtures inside the tank may be exacerbating the issue.
Evacuation orders remain in place:
• North of Garden Grove Blvd
• East of Monarch
• South of Orangewood
• West of Beach Blvd— OCFA (@OCFireAuthority) May 22, 2026
Some accounts indicate a possible reaction involving nitric acid with another chemical at the facility, which could have led to an unstable situation resulting in elevated heat and pressure.
Inhalation of methyl methacrylate poses serious health threats, including respiratory irritation, dizziness, headaches, nausea, and difficulty breathing. Given its extreme combustibility, officials have exercised caution in allowing access to the area while stabilization efforts are underway.
Emergency responders have set up a reunification center at Rancho Alamitos High School as evacuation orders remain in effect. While some of these orders were later lifted, fire officials have continued to keep a close eye on the site through the night and into the following day due to ongoing stability concerns.
Residents have described the atmosphere as surreal, with potent chemical odors permeating the neighborhood as emergency vehicles overwhelmed the area. Social media footage depicted large fumes rising into the sky while helicopters hovered above to document the developing situation.
This incident has drawn parallels to earlier chemical disasters where overheating storage tanks have led to devastating explosions. Hazardous materials experts are currently deliberating on whether to allow the reaction to extinguish naturally or to implement further response measures, each choice carrying its own associated risks.
