Cal. Government Code § 50535

(a) (1) A public building that is owned by a local agency, or a portion of a building that is owned by a local agency and includes at least one restroom that is open to the public, shall provide at least one safe, sanitary, convenient, and publicly accessible baby diaper changing station that is accessible to women entering a restroom provided for use by women and at least one safe, sanitary, convenient, and publicly accessible baby diaper changing station that is accessible to men entering a restroom provided for use by men, or at least one safe, sanitary, convenient, and publicly accessible baby diaper changing station that is accessible to both men and women. (2) Each station shall include signage at or near the entrance to the station indicating the location of the baby diaper changing station. If there is a central directory identifying, for the benefit of the public, the location of offices, restrooms, and other facilities in the building, that central directory shall indicate the location of the baby diaper changing stations. Each baby diaper changing station shall be maintained, repaired, and replaced as necessary to ensure safety and ease of use, and shall be cleaned with the same frequency as the restroom in which it is located. (b) (1) Subdivision (a) applies to all new construction and, except as otherwise provided in paragraph (2), to all renovations of bathrooms, for which a permit has been obtained, in which the estimated cost of the new construction or renovation is ten thousand dollars ($10,000) or more. (2) Subdivision (a) does not apply to a renovation if a local building permitting entity or building inspector determines that the installation of a baby diaper changing station is not feasible or would result in a failure to comply with applicable building standards governing the right of access for persons with disabilities. The permitting entity or building inspector may grant an exemption from the requirements of this section under those circumstances.