Portions of Mission Viejo along the eastern and southern hillside edges are designated as Very High Fire Hazard Severity Zones by CAL FIRE and OCFA. Properties in these zones must maintain 100 feet of defensible space, use fire-resistant building materials, and comply with OCFA vegetation management inspection programs. Annual brush clearance is required before fire season.
Mission Viejo's eastern hillsides bordering the Cleveland National Forest and Trabuco Canyon, as well as areas near Oso Parkway and the southern ridgeline, are mapped as Very High Fire Hazard Severity Zones (VHFHSZ) under California Government Code Section 51178. Properties in these zones must maintain defensible space as required by Public Resources Code Section 4291, which mandates clearing flammable vegetation within 100 feet of structures. Zone 1 extends 30 feet from the structure where all dead vegetation, dry leaves, and combustible materials must be removed. Zone 2 extends from 30 to 100 feet where vegetation must be reduced and spaced to prevent fire spread. OCFA conducts annual vegetation management inspections in designated hazard zones, typically from April through June before peak fire season. Property owners receive inspection notices and must complete clearance by posted deadlines. New construction and significant remodels in VHFHSZ areas must comply with California Building Code Chapter 7A, which requires fire-resistant roofing (Class A), exterior wall coverings, dual-pane tempered glass windows, enclosed eaves, and non-combustible decking within 10 feet of the structure. Existing homes undergoing roof replacement must upgrade to Class A fire-rated materials. OCFA also requires spark arrestors on chimneys and recommends ember-resistant attic vents in wildfire zones.
Property owners who fail to clear vegetation by the OCFA deadline receive a Notice of Non-Compliance with a corrective action period of 14 to 30 days. If not corrected, OCFA may arrange clearance by a contractor and bill the property owner, with costs typically ranging from $500 to $5,000 depending on lot size. Administrative fines of $100 to $500 per violation may also be assessed. California law also provides that property owners may be held liable for fire suppression costs if a wildfire originates from their non-compliant property.
Mission Viejo, CA
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Side-by-side rule comparisons with other cities in Orange County.
See how other cities in Orange County handle wildfire zones.
See how Mission Viejo's wildfire zones rules stack up against other locations.
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