GKN Aerospace Facility Leak in Garden Grove Forces Mass Evacuations

Update May 26, 2026 – J&Y Law has learned that GKN Aerospace has a history of safety violations and has been fined over $900,000 in the past. More info below. If you or your loved ones have been affected by this leak, contact J&Y Law now to get justice.

GKN Aerospace facility leak forces more than 44,000 from their homes as governor declares state of emergency.

GARDEN GROVE, CA (May 23, 2026) — A leaking industrial tank at GKN Aerospace facility has displaced tens of thousands of Orange County residents since Thursday, triggering a governor’s emergency declaration and leaving authorities scrambling to prevent what officials describe as either a catastrophic chemical spill or an explosion.

The crisis began the afternoon of May 22, when crews arrived at the GKN Aerospace facility in the 12000 block of Western Avenue in Garden Grove after receiving a hazardous materials call just before 3:40 p.m. The facility, which makes parts for commercial and military aircraft, holds a storage tank containing a volatile and flammable plastic compound.

The tank holds between 6,000 and 7,000 gallons of methyl methacrylate, which overheated and began venting vapors into the air.

By Saturday, Gov. Gavin Newsom proclaimed a state of emergency in Orange County as officials desperately searched for a safe resolution. “The safety of Orange County residents is the top priority,” Newsom said. “We are mobilizing every state resource available to support local responders.”

GKN Aerospace Facility Leak Timeline

According to Orange County Fire Authority Chief Craig Covey, temperatures inside the tank continue to rise, creating a “significantly dangerous” situation. After crews attempted an overnight operation to neutralize a secondary tank inside the danger zone, they learned temperatures were increasing at a rate of about one degree per hour, reaching 90 degrees Friday night after starting the day at 77.

Covey, who described the situation as the worst he had encountered in 32 years of fire service, laid out a stark picture of the possible outcomes.

“There are literally two options left remaining,” Covey said. “One, the tank fails and spills a total of about 6,000 to 7,000 gallons of very bad chemicals into the parking lot and that area. Or two, the tank goes into a thermal runaway and blows up, affecting the tanks that are around it that have fuel or chemicals in them as well.”

On Saturday, authorities said they were evaluating potential third options and consulting experts across the country. “Letting this thing just fail and blow up is unacceptable to us,” Covey said.

What Is Methyl Methacrylate — and What Does Exposure Do?

Health experts said that methyl methacrylate — a flammable plastic epoxy that generates its own heat — is a respiratory irritant, and potential exposure could lead to lung, skin and eye irritation, nausea and dizziness. The chemical is heavier than air, so its vapor settles and sinks.

USC Assistant Professor of Chemistry Elias Picazo warned that in an uncontrolled environment with a leak, “you can potentially have a lot in the atmosphere, and any flash or spark or even temperature can cause what is known as a runaway reaction — where it’s uncontrolled. It can lead to fires, explosions, where pressure really builds up very quickly.”

Orange County Health Officer Dr. Regina Chinsio-Kwong confirmed the vapor can cause respiratory issues, itching and burning eyes, nausea and headaches.

More Than 44,000 Displaced in Garden Grove

Orange County officials expanded evacuation orders to homes in a one-mile radius across several cities, including Garden Grove, Cypress, Stanton, Anaheim, Buena Park and Westminster. Evacuation shelters were opened across the region, and schools within the affected zone were closed until further notice.

For residents like Danny Pham, who lives only a couple of blocks from the plant, the wake-up call was jarring. Pham had been working late at a Vietnamese restaurant and was shaken awake by his roommate at 7 a.m. Friday. He left minutes later, grabbing only his wallet and passport. By late Friday afternoon, he was still trying to figure out where he would sleep that night.

Retiree Kim Yen, who has lived in Orange County since 1980, worried that neighbors in the local Vietnamese community might not understand the English-language evacuation alert. “They are family,” she said. “I’m hoping they stay alert and listen to the news and the authorities. This is scary.”

GKN Aerospace’s Response

GKN Aerospace said specialized hazardous material teams are assessing the situation. “There are no reports of injuries at this time and our priority remains the safety of our employees, responders, and the surrounding community,” a company spokesperson said.

The cause of the leak remains under investigation. No injuries have been officially reported as of Saturday.

GKN’s $909,000 Fine That Didn’t Make Headlines

GKN Aerospace recently settled an air quality safety violation stemming from a 2020 inspection and agreed to pay a fine of more than $900,000 to the South Coast Air Quality Management District. In early 2025, the company paid $909,935.95 to resolve the matter.

The settlement said that in November 2020, GKN had violated environmental regulations — using chemicals in manufacturing beyond what was specifically permitted, allowing chemical emissions that exceeded legal limits, failing to keep complete records, and failing to obtain permits for some equipment or procedures. The company admitted no wrongdoing but did not dispute the listed violations.

That’s not a company that was operating without scrutiny. It’s a company that was scrutinized, found in violation, and paid to make the matter go away. Whether those prior violations had anything to do with the chemical at the center of this week’s crisis remains unclear. NBC4 Investigates searched through federal and local court records and violation data held by regulatory agencies and did not find other penalties or failed inspections beyond that settlement. More recent inspections had found the company to be “in compliance” with other regulations.

The Chemical Leak Emergency

The incident involves a 22-year-old storage tank containing thousands of gallons of methyl methacrylate, a highly flammable chemical used in plastics and aerospace manufacturing. The crisis began Thursday, May 21, when the tank overheated and valves became inoperable, triggering a vapor release that prompted an initial emergency response.

First responders with the Orange County Fire Authority determined that the chemical had begun to overheat and off-gas pressure. They were able to cool the tank with water hoses to stop further off-gassing but could not chemically neutralize or drain the contents due to a faulty valve. Within two days, the internal temperature of the tank rose to over 100 degrees Fahrenheit. A crack was then discovered in the tank.

Residents weren’t just inconvenienced. The dangerous situation forced nearly 50,000 Orange County residents to evacuate over the weekend. Officials warned that the risk of a BLEVE — a Boiling Liquid Expanding Vapor Explosion — was real and potentially catastrophic. The Environmental Protection Agency says MMA exposure can cause irritation to the skin, eyes and respiratory system, and health officials warned that high concentrations may cause severe respiratory distress, dizziness, nausea and hospitalization.

As of Monday, May 26, officials announced the threat of a catastrophic explosion had been eliminated. The evacuation zone was significantly reduced, now affecting about 16,000 residents, with new boundaries running from Orangewood Avenue to the north, Dale Street to the east, Knott Street to the west and Garden Grove Boulevard to the south. However, officials cautioned that a smaller explosion, fire, or chemical leak still remained possible.

WERE YOU FORCED TO EVACUATE? YOU MAY HAVE A LEGAL CLAIM.

If you or your family were displaced, exposed to toxic vapors, suffered health symptoms, lost income, or incurred costs as a result of the GKN Aerospace chemical leak, you may be entitled to compensation.

Industrial facilities have a legal duty to safely store hazardous materials and protect surrounding communities from foreseeable harm. When those duties are breached — whether through negligence in storage, inadequate safety systems, or failure to prevent a known risk — the people who suffer the consequences have the right to hold the responsible party accountable.

Potential claims may include:

• Personal injury from chemical exposure
• Lost wages and business income due to evacuation
• Property damage and costs of temporary relocation
• Emotional distress from forced displacement

J&Y Law is currently investigating claims on behalf of Garden Grove residents and others affected by this incident. Our attorneys are reviewing the facts and are prepared to pursue legal action against GKN Aerospace.

Consultations are free and confidential. You pay nothing unless we win.

Call us at any time, 24/7 for a free consultation, or text us to speak with an attorney today. Do not wait — evidence and witness accounts are critical in cases like this, and time limits apply under California law.

This article contains news reporting based on publicly available information as of May 23, 2026. The legal section is reviewed by J&Y Law. Filing a lawsuit does not guarantee a specific outcome.