Mono County, CA Swimming Pools & Spas: Pool Permits (2026)

The Mono County Building Division handles permits for the unincorporated areas of the county. The County states that 'Permits are required when there is new construction to a building as well as some repair work or alterations to an existing structure,' and that 'Building permits are mandated by state codes that regulate building, fire, mechanical, plumbing, electrical and other facets of construction.' A new in-ground pool, spa, or hot tub is construction and therefore falls under these permit and inspection requirements; the County does not publish a separate pool-specific ordinance, so plan review follows the adopted California Building and Residential Codes, including the Swimming Pool Safety Act provisions for new residential pools. Separately, Mono County Environmental Health regulates PUBLIC pools and spas: 'Anyone operating a public swimming pool or spa must have a valid health permit,' with regular inspections, water-quality and equipment standards, and required posted safety signage. Private backyard pools are not under the Environmental Health permit program. Applicants should confirm current fees and submittal requirements with the Building Division (Mammoth Lakes 760-924-1823; Bridgeport 760-932-5420) before construction, since the County does not list pool permit fees online.