Sonoma County, CA Swimming Pools & Spas: Fencing Requirements (2026)

Pool barrier rules in unincorporated Sonoma County come from Permit Sonoma guideline CNI-044, which implements California Health & Safety Code 115922 (the Swimming Pool Safety Act). When a building permit is issued for a new or remodeled pool or spa at a single-family home, the property must have at least two of seven listed drowning-prevention features. Per CNI-044, the isolation-enclosure option requires a barrier with a minimum 60-inch height, a maximum 2-inch gap between the bottom of the barrier and the ground, no openings that allow a 4-inch sphere to pass, no handholds or footholds usable by a child under 5, and gates that open away from the pool and are self-closing and self-latching with the latch at least 60 inches above grade. Accepted alternatives among the seven features include removable mesh fencing meeting ASTM F2286 paired with a self-closing, self-latching gate; an approved safety pool cover meeting ASTM F1346-91; exit alarms on doors with direct pool access; self-latching door devices with a release at least 54 inches above the floor; a water-surface entry alarm meeting ASTM F2208; or other approved equivalent protection. Note that a separate property fence (open fence up to 10 feet, solid fence up to 7 feet) may itself be exempt from a building permit under Permit Sonoma BPC-005, but pool-barrier compliance is still required.