Safety Requirements:
Rules and Signs
—Located in a conspicuous place
—Letters at least 4 inches in high
—Letters contrasting color from background
—WARNING SIGNS
— Whenever the pool area is opened for use and no lifeguard service is required or provided, warning signs shall be placed in plain view to the entrances and inside the pool area which state “WARNING--NO LIFEGUARD ON DUTY” legible letters at least 4 inches tall.
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http://tbn0.google.com/images?q=tbn:HJ2G6Lq7ylvrlM:http://facultyfiles.deanza.edu/images/donahuemary/Ahwahneepoolsign.jpg