Each person on board a moving recreational vessel must wear a type I, II, III, or V USCG-approved PFD. The life jacket must be in good, serviceable condition. It must also be size and condition appropriate for the activity at hand.
Boat Length
In California, vessels of all lengths are required to follow the state laws and regulations regarding PFD life jackets.
Compulsory PFD Requirements for California
All children of the age 12 years and younger must wear a USCG-approved life jacket. It must be in good condition and of the proper size for the intended child.
Exceptions from wearing PFDs in California
The child can be without a life jacket when on a sailboat restrained by a harness tethered to a boat. A child can also forego a life jacket when in an enclosed cabin.
Disclaimer: The information presented here is meant to be a general reference for educational purposes. Please check with your state for the most up to date information and any current changes in the laws. Source: BoatUS