Mariposa County, CA Swimming Pools & Spas: Above-Ground Pools (2026)

Mariposa County treats above-ground pools under the same permit framework as in-ground pools, with one specific exemption. Per the County's pool handout quoting 2025 California Building Code §105.2(9), a prefabricated swimming pool accessory to a single-family (Group R-3) home is exempt from a building permit only if it is less than 18 inches deep, is not greater than 5,000 gallons, AND is installed entirely above ground — all three conditions must be met. Any above-ground pool that is 18 inches or deeper, holds more than 5,000 gallons, or is partially in-ground requires a building permit. Permitted above-ground pools must still satisfy the drowning-prevention requirements of California Health & Safety Code sections 115920-115929 (at least two of seven safety features) and have GFCI-protected electrical. The permit submittal still requires a pool/spa information sheet, site plan, equipment plan, documentation of safety features, and (if heated) Title 24 documentation. Because the entire county is unincorporated, these rules apply to all communities including Mariposa, Coulterville, Fish Camp, El Portal, and the Yosemite West and Wawona areas. Contact the Building Department at 209-966-3934 to confirm whether a specific above-ground model needs a permit.