5 county-level rules, plus city-specific rules for 2 cities in Monterey County, California.
Verified from official government sources
Building a swimming pool, spa or hot tub in unincorporated Monterey County requires a building permit from the Housing and Community Development Department. Work must meet the adopted California Building Standards Code and Monterey County Code Chapter 18.22, which governs unincorporated swimming pools, spas and hot tubs.
Monterey County Code Ch. 18.22
The provisions of this chapter shall apply to the construction, installation, alteration, repair, replacement, addition to, use, occupancy and maintenance of all swimming pools, spas and hot tubs in the unincorporated area of the County of Monterey.
Pool enclosures in unincorporated Monterey County follow the California Swimming Pool Safety Act. A compliant barrier must be at least 60 inches high with no more than 2 inches of ground clearance, allow no 4-inch gap, and use a self-closing, self-latching gate that opens away from the pool. An enclosure is one of seven approved safety features.
Cal. Health & Safety Code 115922(a)(1) / 115923
An enclosure that meets the requirements of Section 115923 and isolates the swimming pool or spa from the private single-family home... [enclosure] access gates through the enclosure open away from the swimming pool, and are self closing with a self-latching device placed no lower than 60 inches above the ground, and the enclosure has a minimum height of 60 inches.
Under the California Swimming Pool Safety Act enforced in unincorporated Monterey County, a new or remodeled pool or spa at a single-family home must have at least two of seven approved drowning-prevention features. Public pools, spas and hot tubs are separately regulated and inspected by County Environmental Health.
Above-ground pools in unincorporated Monterey County are regulated swimming pools because California law covers any structure holding water more than 18 inches deep. They require a building permit when applicable, must meet the Pool Safety Act barrier rules, and the pool wall can serve as part of the enclosure only if it meets the 60-inch standard.
Hot tubs and spas in unincorporated Monterey County are regulated under Monterey County Code Chapter 18.22 and the California Pool Safety Act. A spa or hot tub equipped with an approved locking safety cover meeting ASTM F1346 is exempt from the full enclosure rule; without one it is treated like a pool and must meet barrier requirements.
2 cities in Monterey County have their own swimming pools & spas rules. Each link goes to that city's dedicated page with code citations.
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