Colusa County, CA Swimming Pools & Spas: Hot Tub Rules (2026)

The Colusa County Zoning Code does not regulate hot tubs or spas separately, so the controlling rules come from the state. Under the California Swimming Pool Safety Act (Health and Safety Code 115920 et seq.), a "swimming pool" includes spas and hot tubs, and Health and Safety Code 115922 normally requires at least two of seven drowning-prevention safety features when a building permit is issued for a new or remodeled spa at a private single-family home. Importantly, the Act provides an exemption pathway: a spa or hot tub equipped with a listed locking safety cover that complies with the ASTM F1346 standard can be excused from the two-feature requirement, which is why many residential spas rely on a hard locking cover rather than a full fence. When electrical work, gas lines, or plumbing are involved, a building permit and inspection through the County Building Department are typically required, and the installation must conform to the adopted California Building Standards Codes. As with pools, the County does not impose extra local spa rules; it administers the statewide standards. Owners should verify permit applicability and the current code edition with the Building Department before installing a spa.