Cal. Health & Safety Code § 79800

In an action brought against an owner of property to recover costs or expenditures incurred from the state account pursuant to this part in response to a hazardous substance release, the presumption established in Section 79790 may be rebutted if it is established by a preponderance of the evidence that the facts upon which the department made the certification pursuant to subdivision (a), (b), or (c) of Section 79795 are true.