Full Breakdown
Garden Grove Chemical Tank Leak Triggers Massive Evacuations and School Closures
5/26/2026, 1:02:09 AM
Incident Overview
On Thursday, May 22 2026, a 34,000-gallon tank at the GKN Aerospace plant on Western Avenue in Garden Grove began venting methyl methacrylate (MMA), a highly toxic, volatile, flammable chemical. Damaged valves left the tank inaccessible, risking a 6,000-7,000-gallon spill or a thermal-runaway BLEVE. Orange County fire officials declared a crisis and ordered the evacuation of 40,000 residents in Garden Grove and neighboring cities. No injuries have been reported and air-quality monitors remain within healthy limits.
Timeline
Thursday ? 3:30 p.m.: Haz-mat call; sprinklers activated. Thursday night: Evacuation lifted after progress. Friday ? 4 a.m.: Craig Covey reported the tank’s condition had worsened; evacuation reinstated and zone expanded. Friday 2 p.m.: Covey briefed media on two outcomes—spill or explosion. Friday afternoon: Containment continued; shelters opened; schools stayed closed.
Affected Schools & Services
Garden Grove Unified closed 15 campuses, among them Barker, Bryant, Carver, Enders, Garden Park, Lawrence, Wakeham, Patton elementary schools; Bell and Alamitos intermediate schools; Pacifica and Rancho Alamitos high schools. Other districts—Magnolia, Savanna, Westminster, Cypress, Los Alamitos—relocated students, set pickup sites, or shut campuses (e.g., Magnolia, Southwest Anaheim, Anaheim West). Shelters opened at the Garden Grove Sports and Recreation Center, Cypress Recreation Center, Stanton City Hall and a reunification site at Rancho Alamitos High School gym; meals were served at Hare High School.
Official Statements & Criticism
Craig Covey said no gas plume existed but warned the tank could spill or explode. Chinsio-Kwong warned MMA exposure can irritate lungs and cause severe respiratory distress. Derek Tran said his office was closely monitoring the incident and had contacted FEMA and the EPA for assistance. Gavin Newsom said state agencies coordinate with local responders. Officials said the cause is unknown, such MMA incidents are rare, and about 15 % of residents have refused evacuation.
Verbatim Quotes
- “There are literally two options left remaining. One: The tank fails and spills a total of about 6 to 7k gallons of very bad chemicals into the parking lot in that area,” — Craig Covey, OCFA Division Chief
- “I am in contact with federal disaster relief officials, including FEMA and the EPA, to urge them to provide any available federal assistance for Garden Grove.” — Rep. Derek Tran, D-Westminster
- “The chemical in the tank is called methyl methacrylate (MMA).” — Nick Freeman, OCFA Division Chief
- “At very high levels, it can really cause severe respiratory distress and hospitalization.” — Regina Chinsio-Kwong, Orange County Deputy Health Officer
What’s Next
Emergency crews will keep cooling the tank with unmanned high-pressure hoses while industrial contractors explore stabilization options. The OCFA will issue updates on containment, air-quality and any changes to evacuation boundaries.
