California Code of Regulations (Cal. Code Reg.): Title 22 – Social Security > Cal. Code Reg. §65541. Health of Employees and Public Pool Users
(a) No public pool employee having a communicable disease while in an infectious state shall work in any capacity involving contact with pool users, pool water, or the operation of the pool equipment and ancillary facilities at a public pool unless a current written statement is provided by a licensed physician as prescribed in subdivision (b).
(b) No public pool employee or pool user having a communicable disease while in an infectious state, including, but not limited to, Cryptosporidium, giardia, Legionnaires’ disease, and Pseudomonas aeruginosa infection, or while having any symptoms such as a cough, cold sore, or nasal or ear discharge or when wearing bandages, shall not enter public pool water unless the public pool employee or pool user submits a current written statement to the pool operator, signed by a licensed physician, confirming that the public pool employee or pool user does not present a health hazard to others using the public pool or ancillary facilities.
(c) If two or more lifeguards or pool users at a public pool report within 5 days of each other to the pool operator that they have had diarrhea, the pool operator shall report this to the enforcing agent.