Cal. Health and Safety Code § 114271

(a) Except as provided in subdivision (b), the walls and ceilings of all rooms shall be of a durable, smooth, nonabsorbent, and easily cleanable surface. (b) This section shall not apply to any of the following areas: (1) Walls and ceilings of bar areas in which alcoholic beverages are sold or served directly to the consumers, except wall areas adjacent to bar sinks and areas where food is prepared. (2) Areas where food is stored only in unopened bottles, cans, cartons, sacks, or other original shipping containers. (3) Dining and sales areas. (4) Offices. (5) Restrooms that are used exclusively by the consumers, except that the walls and ceilings in the restrooms shall be of a nonabsorbent and washable surface. (6) Dressing rooms, dressing areas, or locker areas. (c) Acoustical paneling may be utilized if it is installed not less than six feet above the floor. The paneling shall meet the other requirements of this section. (d) Conduits of all types shall be installed within walls as practicable. When otherwise installed, they shall be mounted or enclosed so as to facilitate cleaning. (e) Attachments to walls and ceilings, such as light fixtures, mechanical room ventilation system components, vent covers, wall mounted fans, decorative items, and other attachments, shall be easily cleanable.