Cal. Code Regs. tit. 22 § 73539
Occurrences such as epidemic outbreaks, poisoning, fires, major accidents, deaths from unnatural causes or other catastrophes and unusual occurrences which threaten the welfare, safety or health of patients, personnel or visitors shall be reported by the facility within 24 hours either by telephone (and confirmed in writing) or by telegraph to the local health office and the Department. An incident report shall be retained on file in the facility. The facility shall furnish such other pertinent information related to such occurrences as the local health officer or the Department may require. Every fire or explosion which occurs in or on the premise shall be reported within 24 hours to the local fire authority or in areas not having an organized fire service, to the State Fire Marshal.
Cal. Code Regs. Tit. 22, § 73539