Wildfire Zones: Petaluma vs Sonoma
How do wildfire zones rules compare between Petaluma, CA and Sonoma, CA?
Petaluma and Sonoma have similar restriction levels.
Petaluma, CA
Sonoma County
Portions of Petaluma fall within CAL FIRE-mapped Fire Hazard Severity Zones (FHSZ). Properties in 'Very High' FHSZ are subject to PRC §4291 (state) and PMC §17.20.050 (local) defensible-space and ignition-resistant construction standards.
View full Petaluma rules →Sonoma, CA
Sonoma County
The City of Sonoma adopted CAL FIRE's updated Local Responsibility Area Fire Hazard Severity Zone (FHSZ) map on May 7, 2025, designating portions of the city as Moderate, High, and Very High Fire Hazard Severity Zones. New construction and major remodels in High and Very High zones must meet California Building Code Chapter 7A Wildland-Urban Interface ignition-resistant standards.
View full Sonoma rules →Key Facts Comparison
| Fact | Petaluma | Sonoma |
|---|---|---|
| State Statute | PRC §4291 | - |
| Construction Standard | CBC Chapter 7A | - |
| Annual Inspection | By Fire Prevention Bureau | - |
| FHSZ statute | - | Cal. Gov. Code §51178–51179 |
| Current LRA map adopted | - | May 7, 2025 (City Council ordinance) |
| Zones in City of Sonoma | - | Moderate, High, and Very High FHSZ |
| WUI building standards | - | California Building Code Chapter 7A |
| Real-estate disclosure required | - | Yes – Cal. Civ. Code §1103 |
| New CWUIC effective | - | January 1, 2026 |
Highlighted rows indicate differences between cities.
Petaluma FAQ
Where can I check if my parcel is in a FHSZ?
CAL FIRE maintains the official map at osfm.fire.ca.gov; the City Fire Bureau can confirm.
Sonoma FAQ
How do I find out what fire hazard zone my Sonoma property is in?
Use the Sonoma Valley Fire District's Fire Hazard Severity Zone Viewer or CAL FIRE's statewide FHSZ map. The City Council adopted the updated LRA map on May 7, 2025; portions of Sonoma are classified Moderate, High, and Very High FHSZ.
Do I have to use ignition-resistant building materials?
If your property is in a High or Very High FHSZ and you're building new or doing a major remodel, yes — California Building Code Chapter 7A requires Class A roofing, ember-resistant vents, enclosed eaves, dual-paned tempered windows, and other ignition-resistant materials. Existing buildings are not required to retrofit, but defensible space (PRC §4291) and home hardening are strongly encouraged.
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