The evacuation of more than 40,000 residents in Garden Grove, California, remains in effect following concerns over an unstable chemical tank at an industrial site. Despite reducing the threat of a major explosion, authorities warn that a smaller explosion risk persists.

On Monday, Orange County Fire Authority’s Interim Fire Chief, TJ McGovern, emphasized the ongoing danger. He stated, “The crisis is not averted” and confirmed that evacuation zones are still necessary due to the potential for a leak or smaller explosion.

Local officials, including McGovern, are monitoring the situation closely. These precautions follow developments where a crack in the tank helped relieve internal pressure and lower temperatures. Firefighters have been actively cooling the 22-year-old tank, containing over 7,000 gallons of methyl methacrylate, to prevent further escalation.

Chemical data indicate that methyl methacrylate exposure can result in eye and skin irritation and respiratory difficulties. Animal studies also link this chemical to birth defects.

Since the issue arose on Thursday, when firefighters responded to pressure and gas release within the tank, steps have been taken to manage the risk. By Sunday, officials identified a crack that reduced the internal temperature from 100 degrees to 93 degrees.

Incident commander Craig Covey confirmed that the tank has now released some of its pressure. Meanwhile, the local district attorney’s office has opened an investigation into GKN Aerospace, the British company owning the site. The company manufactures various aircraft components for both military and civilian use.

Residents await clearance to return home once safety is assured. State Senator Thomas J. Umberg acknowledged the public’s desire for a speedy resolution, affirming efforts to ensure safety before lifting evacuation orders.