Cal. Wat. Code § 71660
A district may construct, maintain, improve, and operate public recreational facilities appurtenant to facilities operated or contracted to be operated by the district. It may by ordinance provide regulations binding upon all persons to govern the use of such facilities, including regulations imposing reasonable charges for the use thereof. Violation of district regulations relating to vehicle or boat speed limits, defacement of district property, the use, possession or discharge of firearms, weapons or fireworks, the creation of fire hazards, being under the influence of intoxicating beverages or dangerous drugs, or remaining on, or reentering district premises after an authorized district officer or employee has specifically withdrawn consent for a person to utilize district facilities, is a misdemeanor. Violation of any other regulation of the district adopted pursuant to this section is an infraction.
Ca. Water Code § 71660