California Harbors And Navigation Code Section 655.6
(a) It is an infraction for a person under the age of 21
years who has 0.01 percent or more, by weight, of alcohol in his or
her blood to operate any motorized vessel or manipulate water skis,
an aquaplane, or a similar device.
(b) A person may be found to be in violation of subdivision (a) if
the person was, at the time of operating any motorized vessel or
manipulating water skis, an aquaplane, or a similar device, under the
age of 21 years and under the influence of, or affected by, an
alcoholic beverage regardless of whether a chemical test was made to
determine that person's blood-alcohol concentration and if the trier
of fact finds that the person had consumed an alcoholic beverage and
was operating any motorized vessel or manipulating water skis, an
aquaplane, or a similar device while having a concentration of 0.01
percent or more, by weight, of alcohol in his or her blood.
(c) Section 655.1 applies to violations of this section.
(d) A violation of this section is punishable by a fine not
exceeding one hundred dollars ($100). A second violation occurring
within one year of a prior violation which resulted in a conviction
is punishable by a fine not exceeding two hundred dollars ($200). A
third or any subsequent conviction within a period of one year of two
or more prior infractions which resulted in convictions is
punishable by a fine not exceeding two hundred fifty dollars ($250).
A person found to have committed a violation of this section shall
be required to participate in an alcohol education or community
service program as provided in Section 23502 of the Vehicle Code.