(a) Lifeguard service shall be provided for any public swimming pool that is of wholly artificial construction and for the use of which a direct fee is charged. For all other public swimming pools, lifeguard service shall be provided or signs shall be erected clearly indicating that the service is not provided.
(b) “Direct fee,” as used in this section, means a separately stated fee or charge for the use of a public swimming pool to the exclusion of any other service, facility, or amenity.