Mission Viejo, CA Fire Regulations: Wildfire Zones (2026)

The City amended California Residential Code Section R902.1 through Municipal Code § 8.02.270, adding subsection R902.1.1: roofing on any structure inside a Fire Hazard Severity Zone or Wildland-Urban Interface (WUI) area must also comply with Part 7 of the California Wildland-Urban Interface Code. Outside those designated zones, § 8.02.280 (CRC R902.1.2) still requires a Class A fire-retardant covering whenever more than half of an existing roof is replaced within a year, or on any new structure. The City also adopted the entire 2025 California Wildland-Urban Interface Code, based on the 2024 International WUI Code, as its own code under § 8.02.460, folding state wildfire-building standards directly into the Building Code enforced by the Building Official.

The Fire Code restricts ignition sources inside these zones as well. Municipal Code § 8.04.130 (Fire Code § 307.6.2.1) prohibits burning wood or other solid fuel within a fuel modification zone, a Wildfire Risk Area (WRA), or a Wildland-Urban Interface Area, or anywhere conditions could spread fire to the WRA or WUI; the only exceptions are permanent fireplaces sited outside a fuel modification zone or devices the Fire Code Official finds unlikely to start a wildfire. § 8.04.180 (Fire Code § 327.1) adds that welding, cutting torches, tar pots and similar spark-producing equipment used within a Wildfire Risk Area must first clear flammable material 30 feet around the work, keep a shovel and backpack pump extinguisher on hand, and stop work when sustained winds hit 8 mph with humidity under 25% or a red-flag condition is declared. The Orange County Fire Authority enforces the Fire Code under § 8.04.020, while the Building Official enforces the roofing and WUI Code standards on new construction and re-roofs.