California Code, Health and Safety Code - HSC § 116028

Except as provided in Section 116033, “lifeguard service,” as used in this article, means the attendance at a public swimming pool, during periods of use, of one or more lifeguards who possess, as minimum qualifications, current certificates from an American Red Cross or YMCA of the U.S.A. lifeguard training program, or have equivalent qualifications, as determined by the department, and who are trained to administer first aid, including, but not limited to, cardiopulmonary resuscitation in conformance with Section 123725 and the regulations adopted thereunder, and who have no duties to perform other than to supervise the safety of participants in water-contact activities. “Lifeguard services” includes the supervision of the safety of participants in water-contact activities by lifeguards who are providing swimming lessons, coaching or overseeing water-contact sports, or providing water safety instructions to participants when no other persons are using the facilities unless those persons are supervised by separate lifeguard services.