Crack discovered in 34,000-gallon MMA storage tank at GKN Aerospace (12122 Western Ave, Garden Grove); OCFA hazmat response initiated and initial evacuations ordered.

Class-action lawsuit filed against GKN Aerospace by X-Law Group P.C. and Presidio Law Firm LLP on behalf of displaced residents — within 24 hours of Governor's State of Emergency declaration.

Federal Emergency Declaration approved for Orange County, unlocking additional federal resources.

OCFA officials confirm MMA tank stabilized; dropping temperatures reduced internal pressure and eliminated the risk of a massive explosion. Evacuation orders remain in place.

Partial evacuation lift; approximately 16,000 residents remain under active order in CAL FIRE zones 3904–3906.

OCFA confirms all evacuation orders lifted. Residents permitted to return home; Garden Grove commits to an after-action report on preparedness and industrial siting.

Federal authorities serve search warrant at GKN Aerospace in connection with the May chemical tank crisis. GKN commits to holding a public town hall.

Orange County Board of Supervisors earmarks $500,000 to assist residents impacted by the chemical threat.

Garden Grove City Council meeting: residents demand compensation, manufacturing moratorium, and GKN's removal. Council votes to agendize the incident. Councilmember Brietigam states no MMA is being produced and resumption before Q1 2027 is unlikely. $3M relief fund closed due to volume; GKN assessing a direct claims program with no eligibility rules announced.

Garden Grove council meeting: residents demand compensation, a manufacturing moratorium and GKN's removal; council votes to agendize the incident next meeting. Councilmember Brietigam says no MMA is being produced and return before Q1 2027 is unlikely; GKN is assessing a claims program with no rules or deadline released.

Voice of OC reports affected residents may be eligible for compensation through GKN's ongoing claims assessment process.

OCDA announces closure of criminal investigation without charges and discloses negotiated claims program of up to $100 million for 50,000+ displaced residents and businesses, administered by an independent third party. Civil disposition including safety plan and independent monitoring remains under negotiation. GKN targets September 28 for full manufacturing restart.

Orange County Board of Supervisors votes unanimously to hire outside counsel and sue GKN Aerospace to seek penalties and recover county response costs (reported at up to $4 million), separate from the resident claims program.

GKN's Steve Carlin tells the Garden Grove council the $100 million claims program will open in October with a community event in the first week and claims accepted in the first half of the month.

GKN's September 28 manufacturing restart target is missed. Garden Grove Mayor Klopfenstein states GKN has not been permitted to restart and cannot reopen by announcement alone. GKN says it is targeting a phased restart over coming days to weeks, contingent on permits and a court-approved safety plan. GKN's September 25 statement discloses the $100M claims program and safety plan will be submitted jointly with the OCDA to Orange County Superior Court; claims open after approval, with a community event still expected in October.

Sept. 28: Protesters demand an emergency moratorium on GKN reopening as the company's announced restart date passes; Mayor Stephanie Klopfenstein says the date was GKN's and the city has not approved a restart.

OCDA announces $125 million stipulated civil agreement with GKN Aerospace Transparency Systems, Inc. and GKN Aerospace, Inc., filed with a civil complaint in Orange County Superior Court. Terms include up to $100M in household claims (13,000–17,000 households), $8.47M in agency reimbursements, $15M in civil penalties, and a seven-year injunction with an outside monitor paid for by a $1.4M GKN contribution. Agreement is not effective until a judge approves it; no hearing scheduled as of Oct. 13. Claims are capped at $300/night lodging, $50/day each for meals and transportation, and up to $5,000/day for eligible businesses. A community event is planned for October 27.

Months after a toxic gas leak, a group is demanding emergency moratorium that would prevent the GKN Aerospace facility in Garden Grove from reopening.

The Irvine Civic Center, a hub of local government in Irvine, Calif. under a clear sky on Monday, March 3, 2025. " data-large-file="https://i0.wp.com/voiceofoc.org/wp-content/uploads/2026/07/CityHall_Irvine_2025_March_Hatch-scaled.jpg?fit=771%2C514&ssl=1" /> After a mass hazmat evacuation happened i

The Irvine Civic Center on April 11, 2023. Credit: GIL BOTHWELL, Voice of OC " data-large-file="https://i0.wp.com/voiceofoc.org/wp-content/uploads/2026/04/CityHallCityLandmark_Irvine_2023_04_Bothwell-4-2.jpg?fit=771%2C434&ssl=1" /> The proposal comes after two hazardous waste incidents this year pro

GKN Aerospace building in Garden Grove on May 28, 2026. Credit: ANGELINA HICKS, Voice of OC " data-large-file="https://i0.wp.com/voiceofoc.org/wp-content/uploads/2026/06/Edit-GKN_Hicks_2026_May-9439.jpg?fit=771%2C514&ssl=1" /> The $100 million claims program will open in October, along with a public

The OC Board of Supervisors unanimously agreed Tuesday, Aug. 25, to hire outside law firms and initiate litigation against GKN Aerospace to “seek penalties and recover costs” the county incurred in response to the May incident.

GKN Aerospace has agreed to establish a $100M damages fund for impacted residents and businesses after the Garden Grove chemical tank emergency.

FOR IMMEDIATE RELEASE Date: August 24, 2026 Kimberly... The post Orange County District Attorney’s Office Negotiates Claims Program of Up to $100 Million for the More than 50,000 Orange County Residents Evacuated During GKN Aerospace Transparency Systems, Inc. Hazmat Incident in Garden Grove Negotia

The tank at GKN Aerospace in Garden Grove that caused a hazmat incident. Credit: ANGELINA HICKS, Voice of OC " data-large-file="https://i0.wp.com/voiceofoc.org/wp-content/uploads/2026/05/GKN_Hicks_2026_May-9462.jpg?fit=771%2C434&ssl=1" /> State officials denied Westminster’s reimbursement claim for

The tank at GKN Aerospace in Garden Grove that caused a hazmat incident. Credit: ANGELINA HICKS, Voice of OC " data-large-file="https://i0.wp.com/voiceofoc.org/wp-content/uploads/2026/05/GKN_Hicks_2026_May-9374.jpg?fit=771%2C514&ssl=1" /> Residents affected by the chemical tank incident in May might

Supervisor Nguyen said the county will seek reimbursement from the company for the $500,000 so that it can be restored to her district’s discretionary funds.

Lillany Marquez, 18, packs her belongings as she leaves Freedom Hall in Fountain Valley, Calif., after the shelter reached capacity on Saturday, May 23, 2026. Nearly 50,000 residents were evacuated from their homes, with many, like Marquez, arriving at shelters that were already full. " data-large-f

OC

Freedom Hall in Fountain Valley has been set up by the American Red Cross as a shelter for evacuees on May 23, 2026. " data-large-file="https://i0.wp.com/voiceofoc.org/wp-content/uploads/2026/05/148A8748-2.jpg?fit=771%2C434&quality=89&ssl=1" /> On Monday evening, emergency personnel announced that t

WB 22 JEO EUCLID (Westminster)

Freedom Hall in Fountain Valley, became full on May 23, 2026. " data-large-file="https://i0.wp.com/voiceofoc.org/wp-content/uploads/2026/05/0A4A3627.jpg?fit=771%2C514&quality=89&ssl=1" /> OC Fire Authority officials said firefighters verified the tank is cracked and temperature has been dropping – e

Gov. Gavin Newsom and other elected officials in Southern California had requested that President Donald Trump approve an emergency declaration.

A class-action lawsuit has been filed against GKN Aerospace on behalf of Garden Grove residents affected by the ongoing chemical leak crisis that prompted officials to declare a state of emergency. The lawsuit was filed by The X-Law Group P.C. and Presidio Law Firm LLP on behalf of two residents liv