Cal. Health & Safety Code §115921(a) expressly includes 'hot tubs, spas, portable spas' within the definition of 'swimming pool.' Hesperia enforces the Swimming Pool Safety Act and the California Building/Electrical Codes for spa installation under HMC Title 15. Permanently installed spas require a building and electrical permit through the Hesperia Building & Safety Division. A locking safety cover meeting ASTM F1346 is the most common way to satisfy one of the two required SB 442 drowning prevention features.
Under HSC §115921(a), 'swimming pool' or 'pool' means 'any structure intended for swimming or recreational bathing that contains water over 18 inches deep,' including 'hot tubs, spas, portable spas, and wading pools.' Permanently installed spas in Hesperia require a building permit and electrical permit (for 240V hookups, bonding, and GFCI protection per the California Electrical Code, Title 24 CCR Part 3, adopted under HMC Title 15). The SB 442 two-feature requirement (HSC §115922) applies; for spas, the typical compliant configuration is an ASTM F1346 locking safety cover plus one additional feature (door alarm, self-latching door, etc.). Portable spas that plug into a standard 120V outlet may not require a building permit but the SB 442 requirements still attach if the unit is over 18 inches deep. The Hesperia Municipal Code does not impose additional spa-specific rules; setbacks for the spa pad follow the HMC Development Code (Title 16) accessory structure rules. Given High Desert wildfire and water-conservation context, owners should also confirm Mojave Water Agency restrictions before initial fill.
Installing a hard-wired spa without an electrical permit violates the California Electrical Code as adopted under HMC Title 15. Failing to provide two SB 442 features blocks final inspection sign-off (HSC §115922(c)).
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