Cal. Pub. Res. Code § 47550

A city, county, or local agency operating a household hazardous waste collection, recycling, and disposal program in accordance with Article 3 (commencing with Section 47100), and in accordance with Article 10.8 (commencing with Section 25218) of Chapter 6.5 of Division 20 of the Health and Safety Code, is not liable for any damage or injury caused by an action taken by the city, county, or local agency, or an employee or authorized agency of the city, county, or local agency, in the course of the operation of the program, unless the action is performed in bad faith or in a negligent manner. For purposes of this section, it shall be presumed that the action is performed in good faith and without negligence, and this presumption shall affect the burden of proof.