San Mateo County Fire Hazard Severity Zone (FHSZ) and insurance
CAL FIRE wildfire hazard for San Mateo County, California, how physical hazard differs from an insurer's risk assessment, and your home coverage options.
| Wildfire hazard (CAL FIRE FHSZ) | Moderate |
|---|---|
| Earthquake exposure | High |
| Flood exposure | Yes |
| Coastal exposure | Yes |
| Wind-driven fire risk | No |
| Region | Bay Area |
| County seat | Redwood City |
This is a qualitative county-level overview derived from CAL FIRE wildfire hazard data and companion perils, not a parcel-level score. Check a specific address on the CAL FIRE viewer linked below.
Hazard is not the same as your insurance risk
A Fire Hazard Severity Zone measures long-term physical wildfire hazard to guide building codes and defensible-space rules. It is not an insurer's underwriting score, and the California Department of Insurance has stated that CAL FIRE's maps do not by themselves determine insurance rates or availability. Carriers weigh your roof, your defensible space, your access and water supply, and their own catastrophe models - so a zone designation and a carrier's decision can and do diverge.
We explain that gap in full, including what the 2025 statewide map update changed and why most homes destroyed in the Eaton Fire sat outside the mapped very-high zone, on our California Fire Hazard Severity Zone guide. You can look up any San Mateo County address on the official CAL FIRE zone viewer.
Wildfire and home insurance in San Mateo County
Parts of San Mateo County carry moderate wildfire exposure, especially near the wildland-urban interface. Some homes are standard-market, while others near brush and open hills need non-standard or FAIR Plan solutions.
San Mateo County sits in a seismically active area, and because standard home policies exclude earthquakes, separate earthquake coverage is worth considering.
Flooding is a real consideration in San Mateo County, and since standard home policies exclude flood, separate flood coverage may be needed for exposed properties.
Coastal areas of San Mateo County add wind, storm, and flood considerations for properties near the shore.
A Peninsula county straddling the San Andreas Fault, which forms the Crystal Springs reservoirs. Coastal bluffs and the wooded Santa Cruz Mountains fringe add flood and fire exposure.
Major recent wildfires in San Mateo County
These are among the most significant wildfires CAL FIRE has recorded in San Mateo County. They are why parts of the county are mapped at High or Very High hazard - and why some homes here are hard to place in the standard market.
| Fire | Year | Acres | Structures destroyed |
|---|---|---|---|
| CZU Lightning Complex * - Santa Cruz and San Mateo counties | 2020 | 86,509 | 1,490 |
* Incident total spans more than San Mateo County. Acres burned and structures destroyed are CAL FIRE incident totals.
The coastal ridge and Santa Cruz Mountains - Pescadero, La Honda, and the wooded corridor along Skyline - carry the county's hazard, not the bayside cities.
CAL FIRE incident activity in San Mateo County
Between 2015 and 2026, CAL FIRE recorded 6 tracked incidents listing San Mateo County. That is a low count by California standards, which is worth knowing: not every part of the state carries the same wildfire exposure, and premiums here reflect that.
The largest tracked incident touching San Mateo County was the CZU Lightning Complex (Including Warnella Fire) in 2020. It burned 86,509 acres in total, though that figure spans every county the fire reached, not San Mateo County alone.
| Year | Incidents |
|---|---|
| 2017 | 1 |
| 2019 | 1 |
| 2020 | 1 |
| 2021 | 1 |
| 2025 | 2 |
Source: CAL FIRE incident record, 2015-2026. These are incidents CAL FIRE responded to or monitored, not every ignition in California, so treat the count as a measure of significant fire activity rather than a complete tally. Acreage attributed to the county excludes multi-county complexes, because CAL FIRE reports acres per incident rather than per county.
FAIR Plan reliance in San Mateo County
The California FAIR Plan is the state's insurer of last resort - basic fire coverage for homes the standard market will not write. Its policy count is a direct gauge of how hard a county has become to insure.
California FAIR Plan policies in force (residential, commercial, and business owner lines), by county, as of September 2024. Source: California FAIR Plan.
A rising FAIR Plan count does not mean bare-bones coverage is your only option. As an independent broker we still check the admitted and surplus lines markets first, and when the FAIR Plan is the right base we pair it with a difference-in-conditions policy for the theft, liability, and water damage it excludes.
Coverage options in San Mateo County
- Wildfire and hard-to-insure home coverage
- California FAIR Plan plus difference-in-conditions
- Standard homeowners, condo, and renters coverage
Sources
- CAL FIRE Office of the State Fire Marshal - Fire Hazard Severity Zones
- CAL FIRE Fire Hazard Severity Zone Viewer (official address lookup)
- CAL FIRE - Top 20 Largest and Most Destructive California Wildfires; Incident Archive
- California FAIR Plan - policies in force by county (as of 9/30/2024)
- California Department of Insurance
- California FAIR Plan Association
San Mateo County FHSZ FAQ
Is San Mateo County in a Fire Hazard Severity Zone?
Yes. CAL FIRE maps parts of San Mateo County as High or Very High Fire Hazard Severity Zones, especially in the wildland-urban interface.
What was the worst wildfire in San Mateo County?
The most destructive recent wildfire in San Mateo County was the 2020 CZU Lightning Complex, which burned the coastal ridges of southern San Mateo County. CAL FIRE incident records list its acreage and the number of structures destroyed alongside the county's other major fires.
Does a Fire Hazard Severity Zone set my insurance rate in San Mateo County?
No. A CAL FIRE zone classifies long-term physical wildfire hazard for planning and building rules, not insurance pricing, and the California Department of Insurance has stated the maps do not by themselves determine rates or availability. Carriers price each San Mateo County property on its own roof, defensible space, access, and their own catastrophe models.
Can I still get homeowners insurance in San Mateo County?
Yes. As an independent broker we shop admitted carriers writing San Mateo County, then surplus lines wildfire markets and the California FAIR Plan paired with a difference-in-conditions wrap when a home is hard to place in the standard market.
How many wildfires does San Mateo County get?
CAL FIRE recorded 6 tracked incidents listing San Mateo County between 2015 and 2026, with its busiest year being 2025. That covers the fires CAL FIRE responded to or monitored rather than every ignition, so read it as a measure of significant activity.
What was the largest wildfire in San Mateo County?
The largest tracked incident touching San Mateo County was the CZU Lightning Complex (Including Warnella Fire) in 2020, at 86,509 acres. That fire crossed county lines, so the acreage covers every county it reached, not San Mateo County alone.
How many California FAIR Plan policies are in San Mateo County?
As of September 2024, San Mateo County had 2,259 California FAIR Plan policies in force across all lines, up from 458 in 2020 - a sign of how far the standard market has pulled back. The FAIR Plan is the insurer of last resort; a broker can still check admitted and surplus lines options first.
Does the California FAIR Plan cover San Mateo County?
Yes. The California FAIR Plan is available statewide, including San Mateo County, as a last-resort option for fire coverage when the standard market declines. It is typically paired with a difference-in-conditions policy for the theft, liability, and water damage the FAIR Plan does not include.
Insuring a home in San Mateo County?
Tell us what you need and a licensed California broker will reach out with real options. Simple situation or complicated one, we shop it the same way.
Prefer to talk? Call (916) 469-5253.