San Jacinto, CA Environmental Rules: Defensible Space (2026)

Chapter 17.325 (Water Efficient Landscape and Irrigation) carries San Jacinto's landscape-based defensible space rule in § 17.325.060(D). A landscape design plan for a project in a fire-prone area must address fire safety and prevention. The plan must show a defensible space or zone around a building or structure, as required by Public Resources Code Section 4291(a) and (b), avoid fire-prone plant materials and highly flammable mulches, and refer to the local fuel modification plan guidelines. The chapter defines a Fuel Modification Plan Guideline as guidelines from a local fire authority that help residents and businesses developing land or building structures in a fire hazard severity zone.

The chapter reaches new development projects with an aggregate landscape area of 500 square feet or more requiring a building or landscape permit, plan check or design review, and rehabilitated landscape projects of 2,500 square feet or more (§ 17.325.030). Landscape plans, including fuel modification plans, are prepared in compliance with the City's Landscape Design Guidelines. After initial application the Director reviews the plans, and plans for projects in wildland fire hazard areas or hillside locations are submitted to the Fire Chief for approval before final approval of the landscape and irrigation plans.

Fire guidance also shapes plant and mulch choices. Selecting plants from the local Fuel Modification Plan Guidelines is one of the listed water-efficiency methods, and organic mulches are not required where local fuel modification plan guidelines prohibit them.

For hillside development, § 15.28.100 requires unobstructed fire protection equipment access easements in fire hazard areas, and the fire department can require fuel modification zones to minimize fire threats to private property. Construction within 200 feet of a fire hazard area needs one-hour protection for non-noncombustible stairs, balconies, and porches, fully boxed eaves, vents covered with one-fourth inch mesh, and Class A roof coverings.