Mass evacuations in the tens of thousands as a chemical tank threat persisted in Orange County
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Garden Grove, California. — May 21–26, 2026 — Tens of thousands of residents remained displaced across northern Orange County as emergency officials warned that an overheated industrial chemical tank at a Garden Grove aerospace facility could rupture or explode.
This prolonged one of the largest non‑wildfire evacuations in the region’s recent history.
See Orange County Fire Authority (OCFA) Division Chief Craig Covey talk in detail about the incident:
https://www.youtube.com/watch?v=kmcPUsaA6ro
Photo Credit: (Above) A container of methyl methacrylate on a truck in Kawasaki, Kanagawa. The tank in the photo and the tank in the story are NOT related. By Syced - Own work, CC0, https://commons.wikimedia.org/w/index.php?curid=151259665
According to ABC News, about 50,000 people in the city of Garden Grove and several surrounding communities were under evacuation orders. ABC News identified the tank as containing methyl methacrylate, a respiratory irritant used in plastics manufacturing.
Evacuation orders first went into effect Thursday after a storage tank containing methyl methacrylate (MMA) began overheating, sending chemical vapours into surrounding neighbourhoods.
What began as a precautionary 1,000‑foot evacuation zone rapidly expanded into a multi‑city displacement affecting more than 50,000 people across Garden Grove, Cypress, Stanton, Anaheim, Buena Park, and Westminster.
According to CBS News, Orange County Fire Authority Incident Commander and Division Chief Craig Covey said temperatures inside the tank continued to rise, creating what he described as a “significantly dangerous” situation that prompted the evacuation.
Officials had initially believed the temperature inside the Garden Grove industrial tank at GKN Aerospace — which holds an estimated 7,000 gallons of methyl methacrylate — was beginning to cool. But after crews carried out a high‑risk entry into the hazard zone, they discovered the temperature was in fact increasing at roughly one degree per hour. By Friday night, it had reached 90 degrees after starting the day at 77.
“We did put (our) people in harm’s way last night … with an attempt to go in and neutralize the additional tank,” Covey said in a video posted to X on Saturday, explaining that crews entered the danger zone to confirm the stability of a second tank located near the overheating vessel.
As the situation continued to unfold on Saturday, Orange County District Attorney Todd Spitzer announced that his office had opened an investigation into the cause of the tank’s failure and urged potential whistleblowers in the community to come forward with information.
By Friday evening—after initial hopes that the tank was cooling proved incorrect—officials widened the evacuation footprint again, warning that the tank’s temperature was rising at roughly one degree per hour and could fail without warning.
Community centers, high‑school gyms, and church halls across the county were converted into temporary shelters, with local officials reporting a surge in overnight stays as families realized they would not be allowed to return home quickly. The American Red Cross deployed additional staff and supplies, including cots, air purifiers, and medical support teams.
Residents described hurried departures, with some reporting throat irritation and dizziness before leaving. “We were told to close our windows, grab essentials, and go,” said one evacuee from Stanton. “We thought it would be a few hours. Now it’s days.”
State of Emergency Declared
California Gov. Gavin Newsom declared a state of emergency Saturday morning, unlocking state resources to support evacuees and assist local agencies. The declaration also enabled the opening of additional shelters and the deployment of environmental health teams to monitor air quality around the perimeter.
Despite widespread concern, officials said air‑monitoring results remained within acceptable limits outside the immediate hazard zone.
Evacuation Timeline Extends as Risk Persisted
OCFA confirmed Saturday afternoon that the tank remained structurally compromised and that crews were still attempting to cool and stabilize the chemical. A second tank on the site was assessed during a high‑risk entry operation Friday night, but officials said the primary tank remained the critical threat.
Authorities warned residents not to expect a rapid return.
In a development that added new urgency to the crisis, Orange County District Attorney Todd Spitzer announced a formal investigation into the cause of the tank failure. He urged employees and contractors to come forward, saying early cooperation would be taken into account.
Further Reading:
https://www.cbsnews.com/losangeles/news/garden-grove-chemical-leak-plans-orange…
https://ggcity.org/hazmat-incident