California Code, Business and Professions Code - BPC § 8505.5

(a) Notice of the date and place of fumigation, and chemicals to be used, shall be given by the fumigator to the fire department serving the area in which fumigation is to be performed not less than two hours prior to the time fumigation begins.  The fire department shall not charge any fees for any service related to structural pest control activities except for the costs of an emergency response necessitated by illegal or negligent actions.

(b) Notice of each fumigation to be performed shall be given to the commissioner in the county in which the job is to be performed.  The notice, which may be mailed or given by telephone, at the option of the commissioner, shall be given at least 24 hours prior to the time fumigation begins, unless the commissioner determines that less time is sufficient.  A fee shall not be assessed for processing this notice.