California Code, Health and Safety Code - HSC § 1799.107

(a) The Legislature finds and declares that a threat to the public health and safety exists whenever there is a need for emergency services and that public entities and emergency rescue personnel should be encouraged to provide emergency services. To that end, a qualified immunity from liability shall be provided for public entities and emergency rescue personnel providing emergency services.

(b) Except as provided in Article 1 (commencing with Section 17000) of Chapter 1 of Division 9 of the Vehicle Code, neither a public entity nor emergency rescue personnel shall be liable for any injury caused by an action taken by the emergency rescue personnel acting within the scope of their employment to provide emergency services, unless the action taken was performed in bad faith or in a grossly negligent manner.

(c) For purposes of this section, it shall be presumed that the action taken when providing emergency services was performed in good faith and without gross negligence. This presumption shall be one affecting the burden of proof.

(d) For purposes of this section, “emergency rescue personnel” means any person who is an officer, employee, or member of a fire department or fire protection or firefighting agency of the federal government, the State of California, a city, county, city and county, district, or other public or municipal corporation or political subdivision of this state, or of a private fire department, whether that person is a volunteer or partly paid or fully paid, while he or she is actually engaged in providing emergency services as defined by subdivision (e).

(e) For purposes of this section, “emergency services” includes, but is not limited to, first aid and medical services, rescue procedures and transportation, or other related activities necessary to insure the health or safety of a person in imminent peril.