California Code of Regulations (Cal. Code Regs.): Title 24 – California Building Standards Code > Cal. Code of Reg. §3120B.4 No Lifeguard Sign
Where no lifeguard service is provided, a sign shall be posted stating, “NO LIFEGUARD ON DUTY.” The sign also shall state in letters at least 1 inch (25 mm) high, “Children should not use pool without adult supervision.” Exception: “No lifeguard sign” requirement does not apply to spray grounds that have no standing water.