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4w ago

All Evacuation Orders Lifted After Overheated Chemical Tank Threat in Garden Grove

After sustained cooling and a pressure-relieving crack, federal and local monitoring found no airborne methyl methacrylate contamination.

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Roads remain closed after residents were evacuated following a chemical leak from a large storage tank that threatened nearby homes in Garden Grove, California, on May 24, 2026. Authorities in California on May 24 said they discovered a crack in a damaged tank of toxic chemicals, potentially relieving pressure as the threat of an explosion has forced tens of thousands of residents to evacuate. About 50,000 residents were ordered to leave their homes in the Garden Grove area of Orange County, southeast of Los Angeles, on Friday after the tank began to leak, sending fumes over a heavily populated area about five miles from Disneyland. (Photo by Blake Fagan / AFP via Getty Images)
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Overview

  • A pressurized 7,000‑gallon tank of methyl methacrylate at GKN Aerospace overheated and triggered large evacuations after responders detected vapor and rising temperatures, a situation first reported on Thursday.
  • Crews sprayed more than 9 million gallons of water and used remote hose lines to cool the vessel while specialists found a crack that relieved internal pressure and allowed safer, controlled cooling.
  • Officials said Tuesday night that monitoring by the EPA, county health officials and fire teams detected no airborne methyl methacrylate and that the immediate risk of a catastrophic BLEVE explosion was eliminated, so all evacuation orders were lifted.
  • Civil suits and a criminal probe have been opened against GKN alleging negligence in storage, inspection and emergency planning, and regulators will continue testing storm drains and air for weeks to come.
  • Residents and independent experts remain skeptical about whether all releases were detected, pointing to past violations and prior reported releases at the site and calling for stronger oversight given the plant’s proximity to dense neighborhoods.