California Code, Health and Safety Code - HSC § 78765

(a) The department shall adopt, by regulation, criteria for the selection of hazardous substance release sites for a response action under this part. The criteria shall take into account pertinent factors relating to public health, safety, and the environment. The pertinent factors shall include, but are not necessarily limited to, potential hazards to public health, safety, or the environment, the risk of fire or explosion, and toxic hazards, and shall also include the criteria established pursuant to Section 105(a)(8) of the federal act (42 U.S.C. Sec. 9605(a)(8)).

(b) The criteria adopted pursuant to subdivision (a) may include a minimum hazard threshold, below which sites shall not be listed pursuant to this article, if the sites are subject to the authority of the department to order a response action, or similar action, pursuant to Chapter 6.5 (commencing with Section 25100) of Division 20.