🌊 USGS Hazard Rating: HIGH
Eaton & Palisades Burn Scar Debris Flow Risk
Winter 2026-2027
USGS rates the Eaton and Palisades fire burn scars HIGH for debris-flow initiation under peak 15-minute rainfall intensities of just 1.57 inches/hour — a 1-year return interval storm.
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Quick Answer — Burn Scar Debris Flow Winter 2026-2027
The Eaton and Palisades Fire burn scars (January 2025) create HIGH-rated debris flow risk for the 2026-2027 atmospheric river season per USGS Post-Fire Debris-Flow Hazard Assessment data. Peak vulnerability window: winters 2025-26 through 2027-28 (2-5 year post-fire recovery period). The triggering threshold is a peak 15-minute rainfall intensity of 1.57 inches/hour — a 1-year return interval storm. Insurance coverage varies sharply: standard HO-3 policies often exclude earth movement; California FAIR Plan does not cover water damage at all; NFIP excludes debris flow when mud is the primary medium rather than flood water.
USGS Combined Basin Hazard Ratings — Eaton & Palisades Fires
The U.S. Geological Survey prepared post-fire debris-flow hazard assessments for the Eaton and Palisades fires at the request of state and federal emergency officials. The assessments model both likelihood and potential volume of debris flows across the burn area for a series of design rainstorms, at two spatial scales: basin and segment.
| Fire / Burn Scar | Containment Date | Combined Hazard Rating | Peak Vulnerability Window |
|---|---|---|---|
| Eaton Fire (Altadena / Pasadena foothills) | January 2025 | HIGH | Winters 2025-26 through 2027-28 |
| Palisades Fire (Pacific Palisades / Santa Monica Mountains) | January 2025 | HIGH | Winters 2025-26 through 2027-28 |
| Hurst Fire (smaller burn area) | January 2025 | MODERATE | Winter 2025-26 through 2026-27 |
Source: USGS Post-Fire Debris-Flow Hazard Assessment Viewer. Combined hazard ratings derived from likelihood × volume model outputs at the 1-year return interval design storm (peak 15-minute rainfall intensity of 1.57 in/hr).
ZIP-Level Burn Scar Risk Breakdown
The following ZIP-level summary reflects the geographic spread of HIGH and MODERATE debris-flow hazard ratings from the Eaton and Palisades burn scars. Specific basin-level hazard ratings within each ZIP are available via the USGS Post-Fire Debris Flow Hazard Assessment Viewer (linked below).
EATON Burn Scar
- 91001 (Altadena east): HIGH — foothill drainages
- 91003 (Altadena west): HIGH — canyon outlets
- 91011 (La Cañada Flintridge edge): MODERATE-HIGH
- 91101 (Pasadena north): MODERATE — uphill exposure
- 91105 (Pasadena west): MODERATE
PALISADES Burn Scar
- 90272 (Pacific Palisades): HIGH — Santa Monica Mtns canyons
- 90049 (Brentwood edge): MODERATE — canyon-fed drainages
- 90402 (Santa Monica edge): MODERATE — bluff-base drainages
- 90265 (Malibu eastern): MODERATE — coastal canyon mouths
ZIP-level designations are an aggregation of basin-level USGS data. Hazard varies significantly within ZIP codes — consult the USGS Hazard Assessment Viewer for parcel-specific information.
What is post-fire debris flow?
Post-fire debris flow is a high-velocity slurry of water, mud, rocks, vegetation debris, and fire-damaged soil that originates in burn-scarred drainages during heavy rainfall. Hydrologists have described post-fire debris flows as "a flood on steroids" — the same triggering rainfall that would produce a manageable flash flood in unburned terrain can produce a destructive debris flow in a recent burn area.
Three burn-scar conditions amplify the risk:
- Hydrophobic soils. Intense wildfire heat creates a water-repellent layer in the top few inches of soil. Rainwater that would normally infiltrate instead runs off — increasing surface runoff volume by 200-400% per the USGS California Water Science Center.
- Loss of vegetation. The plant cover that normally intercepts rainfall, slows runoff, and binds soil with root systems is gone. Bare slopes shed water and sediment rapidly.
- Accumulated debris. Charred vegetation, loose ash, and fire-cracked rock collect in drainage channels. When water arrives, this material entrains into the flow, multiplying its mass and destructive potential.
The most cited recent example is the January 2018 Montecito debris flow following the December 2017 Thomas Fire, which killed 23 people and destroyed over 100 homes within minutes of initiation. The USGS model that produces the Eaton and Palisades hazard ratings was significantly refined following Montecito.
7-Day Storm Preparation Timeline
When NOAA forecasts an atmospheric river arriving in your area, use this timeline to prepare your property and household. The window narrows rapidly once landfall is confirmed — start the 7-day window as soon as the forecast reaches 80% confidence within the 7-day NWS outlook.
Day
-7
Review evacuation zone status
Check LA County Department of Public Works evacuation zone maps. Confirm your property's zone designation (Yellow, Orange, Red). Sign up for ReadyLA notifications if not already enrolled.
Day
-5
Document property condition
Take comprehensive photos and video of the home interior and exterior. Time-stamped pre-storm documentation is critical for insurance claims. Store backups in cloud (iCloud, Google Photos) or a USB drive you can take if evacuated.
Day
-3
Deploy sandbags & clear drainage
LA County and city fire departments typically issue free sandbags before forecasted storms. Position around downhill openings, garage thresholds, and any sub-grade entrances. Clear gutters, downspouts, and any private drainage channels.
Day
-1
Move valuables, fuel vehicles, prepare go-bags
Move important documents, irreplaceable items, and high-value electronics to upper floors or secure off-site storage. Fuel vehicles. Pack go-bags with medications, ID copies, phone chargers, and 72 hours of supplies.
Day
0
Active monitoring & evacuation readiness
Monitor NWS flash flood watches/warnings. If a Yellow zone is upgraded to Orange (evacuation warning) or Red (evacuation order), comply immediately — debris flow can initiate within 15-30 minutes of peak rainfall onset and travel at over 35 mph. Do not attempt to drive through active debris flow.
Day
+1
Post-storm safety assessment & documentation
Wait for evacuation orders to lift before returning. On entry: do not touch standing water near electrical outlets. Document all damage with photos/video before any cleanup. Contact insurance carrier within 72 hours. For active water damage, call an IICRC-certified contractor — mold colonization begins in 24-48 hours.
Insurance Considerations — The Burn Scar Coverage Gap
Burn scar debris flow falls into a difficult intersection of homeowners insurance, flood insurance, and earth-movement exclusions. Many Eaton and Palisades fire-affected homeowners discover the gap only after damage occurs.
Standard HO-3 homeowners policies
Often EXCLUDE earth movement, which insurers commonly interpret to include mudflow and debris flow. Coverage may apply if water (not mud) was the primary medium of damage. Review your specific policy language carefully — wording varies by carrier and state.
California FAIR Plan (fire-affected homeowners)
The FAIR Plan dwelling policy does NOT cover water damage at all — only fire, lightning, smoke, and internal explosion. Water damage from debris flow, burst pipes, or any other source requires a separate DIC (Difference in Conditions) policy from a private insurer. Many fire-displaced homeowners on FAIR Plan policies are unaware of this gap.
NFIP flood insurance
Covers mudflow only when it is a direct result of flooding (general and temporary condition of partial or complete inundation of normally dry land). Debris flow, where mud and rocks are the primary medium with water as the lubricant, is typically excluded. Standard 30-day NFIP waiting period applies, with limited exceptions for post-wildfire areas.
What to do now
Review your declarations page and policy form. If you are a FAIR Plan policyholder, contact a licensed insurance agent about adding a DIC policy before the 2026-2027 atmospheric river season. If you have a standard HO-3, ask your carrier about debris flow or earth movement endorsements specifically — availability varies. For NFIP considerations and post-fire policy waivers, consult FEMA's flood insurance program.
Active debris flow or water damage right now?
Don't wait — mold colonization begins within 24-48 hours of water exposure. Get matched with a licensed, IICRC- certified SoCal contractor experienced in post-fire debris flow remediation.
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Common Questions — Burn Scar Debris Flow Winter 2026-2027
Quick answers to the questions Eaton and Palisades fire-affected homeowners ask most during atmospheric river season.
How long does post-fire debris flow risk last after a wildfire?
USGS post-fire debris flow hazard studies indicate the highest debris flow risk occurs in the first 2-5 years after a wildfire, with peak vulnerability during the first 2 winters. For the Eaton Fire (January 2025) and Palisades Fire (January 2025), this means the 2026-2027 and 2027-2028 atmospheric river seasons represent peak burn scar debris flow risk windows. The vulnerability gradually decreases as vegetation regrows and soil structure recovers.
Does my homeowners insurance cover burn scar debris flow damage?
Coverage varies significantly by policy form. Standard HO-3 policies often EXCLUDE earth movement, which can include mudflow and debris flow. NFIP flood insurance covers mudflow only if it results from flood conditions — debris flow specifically (mud as the primary medium) is typically excluded. California FAIR Plan dwelling policies do not cover water damage at all and require a separate DIC (Difference in Conditions) policy. Eaton and Palisades fire-affected homeowners should review their declarations page carefully and consider adding debris flow or earth movement endorsements before the 2026-2027 storm season.
How fast can a post-fire debris flow happen?
Per USGS modeling, debris flow can initiate within 15-30 minutes of peak rainfall intensity exceeding 1.57 inches per hour over a 15-minute window — the 1-year return interval threshold for Eaton and Palisades basins. Once initiated, debris flows can travel at speeds exceeding 35 mph (56 km/h). The 2018 Montecito debris flow following the Thomas Fire killed 23 people; the flow reached downhill communities within minutes of initiation. NOAA flash flood warnings and LA County evacuation orders should be heeded immediately when issued.
What ZIP codes are at HIGH risk from Eaton and Palisades burn scars?
Eaton burn scar HIGH-risk ZIP codes: 91001 (Altadena east), 91003 (Altadena west), 91011 (La Cañada Flintridge edge), 91101 and 91105 (Pasadena north). Palisades burn scar HIGH-risk ZIP codes: 90272 (Pacific Palisades), with MODERATE-risk extending to 90049 (Brentwood edge) and 90402 (Santa Monica edge near canyon mouths). Specific basin-level hazard ratings are available via the USGS Post-Fire Debris Flow Hazard Assessment Viewer.
What should I do right now if my home was just hit by debris flow?
(1) Ensure life safety first — call 911 if anyone is trapped or injured. (2) Do not enter the home if structural damage is visible. (3) Once safe, document with photos and video before any cleanup begins — insurance claims require pre-cleanup documentation. (4) Contact your insurance carrier within 72 hours. (5) For water damage cleanup, call an IICRC-certified contractor for water extraction and structural drying; debris removal may require a separate specialist. Mold colonization begins within 24-48 hours of water exposure, so timing matters.
Is the call free?
Yes. Calling (844) 833-1734 is free, and the initial assessment from the matched IICRC-certified contractor is free. You only pay for restoration services you authorize after the assessment.
Related — Eaton & Palisades Fire Recovery Resources
🔥 Eaton Fire Altadena Water Damage Recovery
January 2025 Eaton Fire aftermath — sprinkler damage, firefighting water cleanup, smoke + ash, ongoing mudslide risk.
🔥 Pacific Palisades Fire Recovery Guide
January 2025 Palisades Fire water damage — sprinkler activation, firefighting water, post-fire mudslide / debris flow.
🌧️ California Atmospheric River 2026 Guide
Mudslides, basement flooding, post-fire debris flow, NFIP flood insurance, statewide recovery guide.
🌊 Malibu Storm Damage Restoration
Coastal flooding, post-fire mudslide debris flow, atmospheric river damage, ocean toxic runoff cleanup.
🚨 Emergency Water Damage Altadena
Active water damage in Altadena — IICRC-certified contractor dispatch within 60-120 minutes.
🚨 Emergency Water Damage Pacific Palisades
Active water damage in Pacific Palisades — emergency response, insurance accepted.