California Code, Health and Safety Code - HSC § 118600

(a) All single-user toilet facilities in any business establishment, place of public accommodation, or state or local government agency shall be identified as all-gender toilet facilities by signage that complies with Title 24 of the California Code of Regulations, and designated for use by no more than one occupant at a time or for family or assisted use.

(b) During any inspection of a business or a place of public accommodation by an inspector, building official, or other local official responsible for code enforcement, the inspector or official may inspect for compliance with this section.

(c) For the purposes of this section, “single-user toilet facility” means a toilet facility with no more than one water closet and one urinal with a locking mechanism controlled by the user.

(d) This section shall become operative on March 1, 2017.

(e) This section does not apply to construction jobsites, as described in subdivision (a) of Section 6722 of the Labor Code.