Garden Grove chemical crisis: Explosion risk averted but evacuation holds

Garden Grove chemical crisis fears have eased as the immediate threat of a massive chemical tank explosion in Orange County has been successfully averted.

The Orange County Fire Authority (OCFA) announced on the 25th that the worst-case scenario involving a catastrophic explosion has been eliminated. However, officials stated that the risk of a chemical leak remains, keeping the evacuation order in place for approximately 50,000 residents across six cities.

Garden Grove chemical crisis
A drone photo captured on May 23rd shows robotic firefighting equipment pouring water over the MMA storage tank emitting toxic vapors

Overnight Operations Relieve Tank Pressure

Interim Fire Chief TJ McGovern briefed reporters on the 25th, explaining that overnight tactical operations confirmed internal pressure was safely venting through a newly formed crack in the hazardous tank.

The tank contains approximately 7,000 gallons of liquid Methyl Methacrylate (MMA). On the 23rd, an unexpected internal chemical reaction caused temperatures to surge past 100°F, sparking fears of an imminent blast. Authorities emphasized that this extreme threat has now been “completely eliminated” as the internal temperature dropped to 93°F.

Ongoing Evacuation and Government Response to the Garden Grove chemical crisis

Despite the breakthrough, the OCFA warned that small-scale explosions or chemical toxic leaks are still possible. While air monitoring has not detected harmful toxins so far, shifts in wind direction could potentially spread chemical vapors.

Consequently, mandatory evacuation orders remain active for 50,000 residents in Garden Grove, Stanton, Anaheim, Buena Park, Westminster, and Cypress. Most of the five shelters established by the county have reached maximum capacity. Officials indicated that lifting or easing the evacuation orders would likely be considered after the 26th.

In response to the severity of the situation, President Donald Trump declared a federal emergency for Orange County on the 25th, mobilizing immediate support from the Federal Emergency Management Agency (FEMA) and the Environmental Protection Agency (EPA). This follows California Governor Gavin Newsom’s state-level emergency declaration on the 24th.

Corporate Accountability and Legal Actions

The incident began at 3 p.m. on May 21st at the GKN Aerospace plant on Western Avenue in Garden Grove. When a vital tank valve failed, preventing crews from injecting neutralizing agents or draining the MMA, firefighters resorted to spraying water 24/7 to cool the exterior. High or prolonged exposure to MMA poses severe health risks to humans.

GKN Aerospace, a British aerospace components manufacturer, has operated the Garden Grove facility since 1993, employing around 500 workers. The company has a history of environmental violations; in 2018 and 2021, it was fined approximately $1 million by the South Coast Air Quality Management District (SCAQMD) for unregistered equipment and failing to report chemical emissions.

Legal repercussions are mounting swiftly. Pasadena-based law firms, including X Law Firm and Presidio Law, announced on the 24th that they are launching a class-action lawsuit on behalf of affected residents. Concurrently, Orange County District Attorney Todd Spitzer launched a formal investigation, urging GKN employees and whistleblowers to submit tips via hotline (714-347-8714) or email (tipster@ocdistrictattorney.gov).

BY EUNYOUNG LEE [lee.eunyoung6@koreadaily.com]