California Code, Health and Safety Code - HSC § 118505

(a) Publicly and privately owned facilities where the public congregates shall be equipped with sufficient temporary or permanent restrooms to meet the needs of the public at peak hours.

(b) In conformity with the State Plumbing Code, and except as otherwise provided in this section, standards shall be adopted in order to enforce this section, as follows:

(c) The standards adopted pursuant to subdivision (b) shall be published in the State Building Standards Code contained in Title 24 of the California Code of Regulations.

(d) This section shall apply to facilities where the public congregates that commence construction, or that undertake structural alterations, repairs, or improvements exceeding 50 percent of the entire facility, on or after January 1, 1989.

(e) For the purposes of this section, “facilities where the public congregates” means sports and entertainment arenas, stadiums, community and convention halls, specialty event centers, amusement facilities, and ski resorts.

For purposes of this section, “facilities where the public congregates” also means specialty event centers in public parks.

(f) This section shall not apply to the following:

(g) It is the intent of the Legislature that, in order to ensure that standards are both viable and efficacious, the Office of the State Architect and the State Building Standards Commission hold a series of public meetings with representatives of affected industries and state and local agencies prior to adopting standards under this section.