Riverside, CA Environmental Rules: Defensible Space (2026)
Key Facts
- Clearance distance
- 100 feet from structures
- Inner zone
- 30 feet lean and green
- State law
- PRC Section 4291
- Inspector
- Riverside Fire Department
Summary
Properties near Mt. Rubidoux, Sycamore Canyon, and other Riverside hillside zones must clear flammable vegetation within 100 feet of structures under California Public Resources Code 4291, with seasonal inspections by Riverside Fire Department.
4291. (a) A person who owns, leases, controls, operates, or maintains a building or structure in the state responsibility area shall at all times do all of the following: (1) (A) Maintain defensible space of 100 feet from each side and from the front and rear of the structure, but not beyond the property line, except as provided in subparagraph (B). The amount of fuel modification necessary shall consider the flammability of the structure as affected by building material, building standards, location, and type of vegetation. Fuels shall be maintained and spaced in a condition so that a wildfire would be unlikely to ignite the structure.
Full Breakdown
California requires defensible space clearance in State Responsibility Areas and locally designated very high fire hazard severity zones. In Riverside, hillside neighborhoods abutting open space must maintain a 30-foot lean-clean-green zone and a 30-to-100-foot reduced-fuel zone around each habitable structure. Riverside Fire Department conducts pre-fire-season inspections, typically May through June, and issues correction notices. Repeat noncompliance allows the city to abate vegetation and bill the owner, with costs becoming a property lien if unpaid.
Violations & Fines
Failure to clear within the inspection cycle leads to a written notice, follow-up inspection, administrative fine, and city-contracted abatement billed to the property owner with lien recovery.
Frequently Asked Questions
Do all Riverside homes need defensible space?
Can the city clear my brush for me?
Sources & Official References
Other rules in Riverside
California rules heatmap·Compare Riverside to another location·View the California environmental rules overview
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Defensible Space in Nearby Cities
How other cities in Riverside County handle defensible space.