Notwithstanding any other provision of law, including RCW 70.44.040, whenever the boundary line between contiguous hospital districts bisects an irrigation block unit placing part of the unit in one hospital district and the balance thereof in another such district, the county auditor, upon his or her approval of a request therefor after public hearing thereon, shall change the hospital district boundary lines so that the entire farm unit of the person so requesting shall be wholly in one of such hospital districts and give notice thereof to those hospital district and county officials as he or she shall deem appropriate therefor.