Wildfire Zones: San Diego vs San Marcos
How do wildfire zones rules compare between San Diego, CA and San Marcos, CA?
San Diego and San Marcos have similar restriction levels.
San Diego, CA
San Diego County
San Diego has extensive Very High Fire Hazard Severity Zones (VHFHSZ) due to its canyon-rim topography and Santa Ana wind exposure. SDMC §142.0412 establishes a comprehensive brush management program with Zone 1 (0-35 ft from structures) requiring fire-resistant, maintained plantings and Zone 2 (35-100 ft) requiring 50% vegetation reduction. The Fire-Rescue Department conducts door-to-door brush assessments for properties along canyon rims in VHFHSZs.
View full San Diego rules →San Marcos, CA
San Diego County
Most of unincorporated San Diego County is mapped as a Very High Fire Hazard Severity Zone and Wildland-Urban Interface (WUI) area. The County Consolidated Fire Code imposes WUI building standards, 100-foot defensible space, structure setbacks, and ignition-resistant construction. CAL FIRE and the County Fire Authority enforce these rules.
View full San Marcos rules →Key Facts Comparison
| Fact | San Diego | San Marcos |
|---|---|---|
| Code Section | SDMC §142.0412 | - |
| Zone 1 | 0-35 ft: fire-resistant, low-growing plants maintained year-round | - |
| Zone 2 | 35-100 ft: remove dead vegetation; reduce coverage by 50% | - |
| VHFHSZ | Canyon rims and hillside areas throughout the city | - |
| Real Estate | Defensible space inspection required at sale per CA CC 1102.19(a) | - |
| Hazard designation | - | Very High Fire Hazard Severity Zone (CAL FIRE) |
| WUI standards | - | County Fire Code Ch. 47 / Appendix II-A |
| Structure setback | - | Min 30 ft from property lines (Sec. 4707.1.1) |
| Construction | - | Ignition-resistant (CBC Chapter 7A) |
| Defensible space | - | 100 feet (Secs. 68.401-68.406) |
| Road width | - | Min 24 ft for >2 dwellings |
Highlighted rows indicate differences between cities.
San Diego FAQ
Who enforces brush management in San Diego?
The San Diego Fire-Rescue Department conducts annual door-to-door assessments in VHFHSZ areas. Properties outside the program are assessed on a complaint basis.
Do I need an inspection to sell property in a fire zone?
Yes. California Civil Code 1102.19(a) requires documentation of a compliant defensible space inspection per SDMC §142.0412 or CA Fire Code before close of escrow since July 1, 2021.
San Marcos FAQ
Is my unincorporated property in a wildfire zone?
Much of unincorporated San Diego County is mapped by CAL FIRE as a Very High Fire Hazard Severity Zone and Wildland-Urban Interface area. You can check the CAL FIRE fire hazard severity zone maps or the County's GIS to confirm your parcel's designation.
What extra rules apply to building in a WUI fire area?
New construction must use ignition-resistant materials (California Building Code Chapter 7A), meet minimum 30-foot structure setbacks (County Fire Code Sec. 4707.1.1), provide compliant fire-apparatus access roads, and maintain 100 feet of defensible space.
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