California Code, Public Resources Code - PRC § 4125

(a) The board shall classify all lands within the state, without regard to any classification of lands made by or for any federal agency or purpose, for the purpose of determining areas in which the financial responsibility of preventing and suppressing fires is primarily the responsibility of the state. The prevention and suppression of fires in all areas that are not so classified is primarily the responsibility of local or federal agencies, as the case may be.

(b) On or before July 1, 1991, and every 5th year thereafter, the department shall provide copies of maps identifying the boundaries of lands classified as state responsibility pursuant to subdivision (a) to the county assessor for every county containing any of those lands. The department shall also notify county assessors of any changes to state responsibility areas within the county resulting from periodic boundary modifications approved by the board.

(c) A notice shall be posted at the offices of the county recorder, county assessor, and county planning agency that identifies the location of the map, and of any information received by the county subsequent to the receipt of the map regarding changes to state responsibility areas within the county.