Orange County Emergency as Chemical Tank Threatens Blast

California Governor Gavin Newsom has declared a state of emergency in Orange County as a failing chemical storage tank at an aerospace facility in Garden Grove continues to heat up, threatening either a catastrophic explosion or a massive toxic spill. More than 44,000 residents across six cities remain under mandatory evacuation orders as emergency crews race to stabilize the situation.

The Crisis Unfolds

The incident began at approximately 3:30 p.m. PDT on Thursday, May 21, when a 34,000-gallon storage tank containing methyl methacrylate (MMA) — a volatile, flammable liquid chemical used in plastic and acrylic manufacturing — began overheating and venting vapors at the GKN Aerospace facility in Garden Grove, according to Fox News. The tank currently holds an estimated 6,000 to 7,000 gallons of the hazardous chemical.

Firefighters initially brought the situation under control with cooling measures, and evacuation orders were temporarily lifted Thursday night. However, the crisis severely escalated by Friday morning when crews discovered that broken valves prevented chemical neutralization. Evacuation orders were reinstated and expanded to a one-mile radius.

Temperature Rising

Orange County Fire Authority Incident Commander Greg Covey delivered a grim update Saturday morning after an overnight mission in which crews entered the hazard zone to manually check the internal temperature gauge. The temperature had reached 90°F (32°C), rising from 77°F (25°C) on Friday morning — an average increase of approximately 1°F per hour, as reported by NPR.

“This thing is going to fail, and we don’t know when,” Covey said. “We’re doing our best to figure out when or how we can prevent it.”

Authorities have identified two possible outcomes: the tank could fail and spill thousands of gallons of toxic chemicals onto the ground, or it could undergo “thermal runaway” and explode, potentially triggering a chain reaction with neighboring fuel and chemical tanks, including a 15,000-gallon adjacent tank.

Emergency Response

Newsom declared a state of emergency Saturday afternoon, directing the California Governor’s Office of Emergency Services and all state agencies to support impacted communities. The proclamation unlocks additional resources, including making state-owned properties available as shelters.

Crews have shifted from a defensive to an offensive posture, according to FOX 11 Los Angeles. Overnight on May 22-23, personnel entered the hazard zone to neutralize the adjacent 15,000-gallon tank and manually read the failing tank’s temperature gauge. The primary mitigation strategy now involves a continuous deluge of water to allow the chemical to “cure” and harden from the outside in, similar to an ice cube forming.

“We are not giving up,” Covey said. “We are going to do everything we can to mitigate this, protect your residences, protect our environment and get you back home.”

Evacuation and Health Risks

The mandatory evacuation zone covers a nine-square-mile area with a one-mile buffer around the facility, affecting parts of Garden Grove, Anaheim, Buena Park, Cypress, Stanton, and Westminster. OCFA Division Chief Nick Freeman presented blast zone maps showing three concentric circular zones extending outward from the tank, with the innermost zone posing a risk of “severe structural damage and significant harm.”

Dr. Regina Chinsio-Kwong, Orange County Health Officer, warned that if the chemical reacts and releases vapor, inhalation could cause significant damage to the lungs and nasal passages, as well as nausea and dizziness. However, officials from the EPA and South Coast Air Quality Management District report that pollutant levels outside the evacuation zone remain normal, and residents outside the area do not need to wear masks.

Community Impact

The crisis has forced the closure of 15 schools in the Garden Grove Unified School District, multiple road closures including Beach Boulevard and State Route 22 off-ramps, and the cancellation of the Garden Grove Strawberry Festival parade. Nearby major attractions including Disneyland and Knott’s Berry Farm remain open but are monitoring the situation.

Garden Grove, home to Little Saigon and one of the largest Vietnamese-American communities in the United States, has seen emergency updates translated into Vietnamese, Korean, and Spanish by local media.

Legal and Regulatory Scrutiny

A class action lawsuit was filed Saturday against GKN Aerospace on behalf of evacuated residents, seeking hundreds of millions in damages. Orange County District Attorney Todd Spitzer has announced an investigation into potential neglect by the company, which has a history of safety and environmental violations, including OSHA citations in 2018 and nearly $1 million in fines from the South Coast Air Quality Management District in 2021.

What’s Next

Emergency crews continue to apply a continuous water deluge, hoping the chemical will cure and harden before the tank fails. Experts from across the country are consulting on the crisis, but officials acknowledge that the exact timing of a potential failure remains unknown. The situation remains fluid, with authorities urging all residents in the evacuation zone to comply with orders and stay clear of the area until further notice.