The UL Research Institutes’ Fire Safety Research Institute analysis cites interconnected system failures for the tragic outcomes of the 2025 firestorm

COLUMBIA, Md. — UL Research Institutes’ Fire Safety Research Institute has released the “Southern California Fires Incident Analysis Report,” identifying 175 findings and offering 266 recommendations aimed at improving resilience, preparedness and response following the devastating Southern California fires of January 2025.

The analysis found wildfire and community conflagration outcomes were shaped by the combined performance of numerous interconnected systems rather than a single point of failure.

The fires, including the Palisades and Eaton fires, occurred under extreme wildfire conditions marked by powerful Santa Ana winds, critically dry vegetation and rapid fire spread from vegetation into the built environment. The fires are among the most deadly, destructive and costly wildfire disasters in California history.

UL Research Institutes conducted an extensive data collection effort, building on a similar approach used in its analysis of the 2023 Lahaina Fire, to establish a timeline and fact base around these fires. This work resulted in the publication of the first report, the Southern California Fires Timeline Report.

The new report builds on the timeline report, examining the conditions, decisions, actions and systems that influenced the wildfires and resulting community conflagrations before and during the disaster. It covers emergency preparedness and management, water and electric utilities, weather and vegetation, evacuation warnings and orders, transportation, fire and law enforcement actions and policies, fatalities and built environment factors.

Before the fires, California and local agencies had implemented a range of risk reduction and preparedness measures, including defensible space programs, vegetation management, public preparedness efforts, evacuation planning and notification systems, mutual-aid frameworks and firefighting resources. Despite these investments, the intensity, magnitude and complexity of the Palisades and Eaton Fires challenged many of the assumptions on which existing programs and response strategies were based.

According to ULRI: “The analysis identified considerable challenges in the implementation and performance of community-wide risk reduction measures, incident management processes, evacuation coordination, situational awareness, infrastructure resilience, fire suppression effectiveness, and resource accountability. Findings also indicate that wildfire exposure and structure loss are increasingly shaped by factors at the neighborhood and community scale, extending beyond individual properties and conventional mitigation practices.”

Some of the key recommendations highlighted in the newest report:

• Advancing community-scale wildfire mitigation;
• Increasing readiness for large wind-driven community conflagrations;
• Strengthening situational awareness and operational intelligence;
• Advancing fire suppression capabilities for community conflagrations;
• Expanding wildfire-resistant building practices and community preparedness;
• Improving evacuation and communications interoperability;
• Enhancing infrastructure performance under extreme conditions; and
• Developing standardized post-suppression procedures.

Read the full list of findings and recommendations in the report below.

The following timelapse animations of the Palisades and Eaton fires layer each fire’s progression and evacuation activity.

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