California Code, Health and Safety Code - HSC § 26148

(a) Residential landlords shall provide written disclosure to prospective tenants of the potential health risks and the health impact that may result from exposure to mold by distributing a consumer-oriented booklet developed and disseminated by the department.

(b) The requirements of this section shall be provided to prospective residential tenants prior to entering the rental or lease agreement.

(c) The requirements of this section shall not apply until the first January 1 or July 1 that occurs at least six months after the department approves the consumer-oriented booklet, as described in subdivision (a).