Government » Departments » Fire » Fire Prevention

Fire Hazard Severity Zones

Font Size: + -
Share & Bookmark, Press Enter to show all options, press Tab go to next option
Print

Fire Hazard Severity Zones

2025 Fire Hazard Severity Zone Updates

Updated 2025 Fire Hazard Severity Zones

The State Fire Marshal's Office has updated the Fire Hazard Severity Zones (FHSZ) for 2025 to better reflect areas with elevated wildfire hazard. These updates utilize scientific research, climate data, and fire modeling to improve community preparedness. The updated zones were adopted by City Council on May 6, 2025, and incorporated into Fullerton Municipal Code 13.19.

What Are Fire Hazard Severity Zones?

Fire Hazard Severity Zones (FHSZ) are geographic areas classified by the California Department of Forestry and Fire Protection (CAL FIRE) based on the likelihood and potential severity of wildfire. The classifications account for factors such as terrain, vegetation, weather patterns, and fire history. Zones are assigned one of three hazard ratings:

Moderate Elevated wildfire risk with some contributing factors present
High Significant wildfire risk from vegetation, terrain, or weather
Very High Most severe risk; subject to additional building and maintenance requirements

What Does This Mean for Property Owners?

Properties within a designated FHSZ may be subject to building code requirements, vegetation management standards, and disclosure obligations during real estate transactions.

If your property falls within a Very High Fire Hazard Severity Zone, you are required by state law to maintain defensible space around all structures. Visit our Defensible Space page for detailed guidance on zone-by-zone clearance requirements and an annual self-inspection checklist.

New to defensible space? Our Defensible Space page explains the three clearance zones (0, 1, and 2), vegetation spacing standards, and what you need to do to keep your property compliant and safe.

Searchable Hazard Map

Use the official interactive viewer below to see the current classification for your area. You can search by address to determine if your property falls within a Moderate, High, or Very High hazard zone.

Resources

FHSZ Documents

Download PDF Map

State & Regional Links

Questions about your Fire Hazard Severity Zone?

Contact Fullerton Fire Prevention at (714) 738-6500 or email