California Code, Water Code - WAT § 30062

All land which is now privately owned and situate within the exterior boundaries of any district, but which was public land of the United States or of this State at the time of the formation of the district and has not heretofore been added to the district is hereby added to the district. The Legislature hereby finds and determines that all of the land is and will be benefited by the formation, existence and operation of the district.