California Code of Regulations (Cal. Code Regs.): Title 24 – California Building Standards Code > Cal. Code Reg. §3120B.11 Diarrhea.
A sign in letters at least 1 inch (25 mm) high and in a language or diagram that is clearly stated shall be posted at the entrance area of a public pool which states that persons having currently active diarrhea or who have had active diarrhea within the previous 14 days shall not be allowed to enter the pool water.