5 county-level rules, plus city-specific rules for 4 cities in Sonoma County, California.
Verified from official government sources
In unincorporated Sonoma County, a building permit from Permit Sonoma is required for in-ground pools and spas. Plans must be prepared by a California-licensed civil or structural engineer and include fencing, drainage, and soils details under Permit Sonoma guideline CNI-044.
Sonoma County Code § 7-15, Private swimming pool — General (per Permit Sonoma CNI-044)
Pool plans, specifications and design calculations shall be prepared by a civil or structural engineer, licensed to practice in the State of California... soils in Sonoma County shall be assumed to be expansive unless the owner can show by actual soil tests, performed by a recognized soil testing laboratory, that the soils are not expansive.
Permit Sonoma guideline CNI-044 implements the California Pool Safety Act: when a pool permit issues, at least two of seven drowning-prevention features are required. The isolation-enclosure option needs a barrier at least 60 inches high with self-closing, self-latching gates opening away from the pool.
Permit Sonoma CNI-044 Swimming Pool Safety Regulations, citing Sonoma County Code § 7-15 and CA Health & Safety Code § 115923
An enclosure that meets the requirements of Section 115923 [of the Health & Safety Code] and isolates the swimming pool or spa from the private single-family home... A minimum height of 60 inches... Gaps or voids, if any, do not allow passage of a sphere equal to or greater than 4 inches in diameter.
Beyond barriers, Permit Sonoma guideline CNI-044 requires anti-entrapment drains, GFCI-protected wiring, proper bonding, and approved underwater lighting for new pools, implementing California Building, Electrical, and Plumbing Code standards in the unincorporated County.
Permit Sonoma exempts prefabricated above-ground pools that do not exceed 5,000 gallons and are installed entirely above ground from a building permit. Larger or in-ground above-ground installations need a permit, and pool-safety barrier rules still apply.
Permit Sonoma BPC-005; Sonoma County Code Ch. 7; Permit Sonoma CNI-044
Prefabricated pools accessory to a single-family dwelling, which do not exceed 5,000 gallons and are installed entirely above ground [are exempt from a building permit]. Although some work is exempt from a building permit, additional permits or review may be required. ... [Per CNI-044:] 'private swimming pool' shall include any structure, whether in-ground or above ground, designed or used for ...
Permit Sonoma treats spas and hot tubs holding water deeper than 18 inches as swimming pools under guideline CNI-044, so a permit and the California Pool Safety Act's two-feature barrier rules apply. Many portable spas with locking covers can satisfy a safety feature.
Cal. Health & Safety Code Sections 115921, 115922, 115925; Permit Sonoma CNI-044
'Swimming pool' or 'pool' means any structure intended for swimming or recreational bathing that contains water over 18 inches deep. 'Swimming pool' includes in-ground and aboveground structures and includes, but is not limited to, hot tubs, spas, portable spas, and nonportable wading pools. ... [HSC 115925: the article's requirements do not apply to] Hot tubs or spas with locking safety covers...
4 cities in Sonoma County have their own swimming pools & spas rules. Each link goes to that city's dedicated page with code citations.
4 verified rules • Above-Ground Pools, Fencing Requirements
3 verified rules • Above-Ground Pools, Fencing Requirements
3 verified rules • Above-Ground Pools, Fencing Requirements
5 verified rules • Above-Ground Pools, Fencing Requirements
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