Cal. Health & Saf. Code § 79845
A public agency operating a household hazardous waste collection program or a person operating a household hazardous waste collection program under a written agreement with a public agency, or, for material received from the public as used oil, a person operating a certified used oil collection center as provided in Section 48660 of the Public Resources Code, shall not be held liable in a cost recovery action brought pursuant to Section 79650, including, but not limited to, an action to recover the fees imposed by Section 79105 or an action brought pursuant to Section 79670, for waste that has been properly handled and transported to an authorized hazardous waste treatment, storage, or disposal facility at a location other than that of the collection program.
Ca. Health and Saf. Code § 79845