ALTADENA — The Los Angeles County Fire Department released the conclusion of an investigation into the Eaton Fire on Tuesday. The report determined that electrical arcing on an out-of-service Southern California Edison transmission tower caused the Eaton Fire.

The Eaton Fire started on January 7, 2025. The blaze killed 19 people and destroyed or damaged more than 9,000 homes and businesses.

The investigation lasted 18 months and was conducted jointly by the Los Angeles County Fire Department's Arson Fire Investigation Unit and Cal Fire. Investigators analyzed Southern California Edison electrical utility and mechanical systems, as well as photographic and video evidence. The review included retained electrical and metallurgical experts.

The tower involved in the ignition is located on a ridge above the Eaton Wash in the Eaton Canyon area. The report stated that arcing events ejected hot metal particles that fell to dry vegetation below the tower. Two electrical arcing events occurred in quick succession, causing an unknown burning material to fall from the tower.

Within 12 seconds, dry grass and brush was ignited and the fire developed into a conflagration engulfing areas of the San Gabriel Mountains, Altadena, Pasadena, Sierra Madre and La Canada Flintridge. A Pasadena resident called 911 on January 7 after spotting flames across the canyon from his home’s rear window. The caller described the fire as a 10’ x 10’ fire at the base of a high-voltage electrical tower.

The fire occurred during an extreme Santa Ana windstorm. It took firefighters nearly a month to extinguish the blaze. It took more than two weeks to fully contain the wildfire.

The fire scorched 22 square miles. The Eaton Fire primarily affected Altadena and also affected Pasadena.

Eighteen of the 19 people who died in the fire lived in west Altadena. Fire Chief Anthony C. Marrone addressed the findings in an official statement. "I recognize that no report or investigation into the Eaton Fire can ease the deep pain and tragedy our residents have endured," Marrone said. "While the cause has been determined, our focus remains on assisting our residents to rebuild their homes and livelihoods, and ensuring lessons learned drive meaningful and impactful change in memory of the 19 lives lost."

The report found that the utility was responsible for maintaining and operating its electrical lines and equipment in a manner that would minimize the risk of catastrophic wildfire. Southern California Edison has a history of known 'ignition risk' with transmission lines in the Altadena area, and records show that these towers needed repairs, according to the Los Angeles Times. Southern California Edison (SCE) has stated that the possibility that an idle, unconnected Southern California Edison transmission line reenergized on January 7 is a leading hypothesis for what started the Eaton fire, the.

Kathleen Dunleavy, a spokesperson for Southern California Edison, said the utility has received the report and is reviewing it. "We have taken our potential role in the start of this fire seriously from the very beginning," Dunleavy said. Southern California Edison paid more than $314 million to victims of the fire through its Wildfire Recovery Compensation Program.

The United States Department of Justice filed two lawsuits against Southern California Edison seeking tens of millions of dollars in damages. The federal complaints alleged the company’s negligence caused the Eaton Fire which burned nearly 8,000 acres of land in the Angeles National Forest. In separate legal filings, Southern California Edison claimed that Los Angeles County agencies failed to send timely evacuation warnings to residents in east and west Altadena.

The utility also claimed in lawsuits that water agencies, including Pasadena Water and Power, did not provide enough water as the fire spread. Los Angeles County declined to comment about the latest court filings.

Fire survivors and consumer advocacy groups allege that Governor Gavin Newsom is supporting legislation to limit compensation for fire victims’ pain and suffering, eliminate insurance companies’ right to recover wildfire costs from utilities, and cap attorneys’ fees. San Diego Gas & Electric, Southern California Edison, and Pacific Gas & Electric donated more than $1.2 million to sitting legislators during the 2025-26 session, according to CalMatters’ Digital Democracy Database.

Research titled Community Survey Report: The REBUILD survey conducted in response to the January 2025 Palisades Fire and Eaton Fire in Los Angeles County was published in 2025. The Palisades Fire killed 12 people and destroyed more than 6,800 homes and buildings in Pacific Palisades. PureSource News previously reported that the EPA found lead soil levels below concern in the Altadena fire area. Earlier coverage on 2026-05-19 reported that a firm found LA county officials did not discriminate in response to the Eaton fire.

The determination that an out-of-service transmission tower caused one of the deadliest wildfires in recent California history establishes a direct link between utility infrastructure maintenance and catastrophic loss. The finding places responsibility on Southern California Edison for minimizing wildfire risk, even on lines not actively in service. This conclusion intersects with ongoing federal litigation seeking tens of millions in damages and state-level debates over victim compensation and utility liability.

The scale of the destruction, which impacted more than 9,000 structures and claimed 19 lives, reflects the stakes for regulatory oversight and emergency response protocols. With allegations of delayed evacuation warnings and insufficient water supply pending in court, the investigation’s findings serve as a focal point for accountability. The concurrent political contributions by major utilities and legislative proposals affecting victim recovery further contextualize the dispute within broader policy and financial frameworks.

Why It Matters

The official determination that electrical arcing from an out-of-service tower ignited the blaze establishes utility responsibility for maintaining equipment to minimize wildfire risk. This finding directly impacts ongoing legal disputes where Southern California Edison alleges local agencies failed in evacuation warnings and water supply. With 19 deaths and over 9,000 structures damaged, the report's conclusions will shape liability assignments and reconstruction efforts for affected communities.