California Code, Health and Safety Code - HSC § 26145

(a) Any tenant of a commercial or industrial real property who knows or is informed that mold is present in the building, heating system, ventilating or air-conditioning system, or appurtenant structures, or that there is a condition of chronic water intrusion or flood, and is responsible for maintenance of the property shall inform the landlord in writing of that knowledge as soon as is reasonably practicable and shall correct the condition in compliance with the terms of the contract with the landlord.

(b) 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 adopts standards pursuant to Sections 26103 and 26105 and develops guidelines pursuant to Section 26130.