California Code, Public Resources Code - PRC § 43602

(a) Except as provided in subdivision (b), evidence of financial ability required of an owner or operator of a solid waste landfill, as defined in Section 40195.1, shall be adjusted to equal the estimated costs of closure and 15 years of postclosure maintenance in the approved plans. Revisions in the plans prior to closure shall be accompanied by corresponding revisions in cost estimates and financial assurances.

(b) On and after the effective date of the federal regulations set forth in Subpart G (commencing with Section 258.70) of Part 258 of Title 40 of the Code of Federal Regulations, the evidence of financial ability required of an owner or operator of a solid waste landfill shall be adjusted to equal the estimated costs of closure and 30 years of postclosure maintenance in the approved plans. Revisions in the plans prior to closure shall be accompanied by corresponding revisions in cost estimates and financial assurances.