Perris, CA Fire Regulations: Wildfire Zones (2026)

CAL FIRE's Office of the State Fire Marshal classifies land into Fire Hazard Severity Zones (FHSZ) — moderate, high and very high — based on vegetation, terrain, fire history and fire weather. Although much of Perris is flat valley, farmland and warehouse land, the city is NOT a no-zone city: the City of Perris maintains a Fire Hazard Severity Map page for its Local Responsibility Area (LRA) and has published an updated High Fire Severity Zone Map, indicating that parts of the city carry hazard-zone designations. Because Perris is an incorporated city served by CAL FIRE/Riverside County Fire under contract, its mapped zones fall in the Local Responsibility Area rather than a State Responsibility Area. FHSZ designations drive wildfire-specific obligations: properties in higher-hazard zones must follow stricter defensible-space and home-hardening standards, and new construction and major renovations in High or Very High zones must meet Wildland-Urban Interface (WUI) building standards (California Building Code Chapter 7A and California Residential Code Section R337). California's 100-foot defensible-space requirement under Public Resources Code 4291 applies primarily to structures in or near State Responsibility Areas and Very High Fire Hazard Severity Zones. Given the mixed terrain, the correct approach is to verify the specific parcel: the City of Perris provides an FHSZ lookup, and CAL FIRE offers a statewide FHSZ viewer by address. Owners of flat in-town parcels outside any mapped zone are generally not subject to wildfire defensible-space or WUI rules, while owners in mapped High zones are.