The board shall in the notice, ordinance, or resolution calling an election consolidate it with the general election to be held at the same time in the respective counties in which the district is located and authorize the respective boards of supervisors to canvass the returns and certify the result of the canvass to the board. It shall be the duty of the board or boards of supervisors to so consolidate the election, canvass the returns, and cause the result thereof to be properly certified to the board of directors of the district. The election shall be held in all respects as if there were only one election, and only one ticket or ballot shall be used. When the county precinct boundaries do not coincide with the boundaries of the wards in the district, the board or boards of supervisors shall, for the purpose of the election only, reprecinct the territory in which the boundaries do not coincide, at least 30 days before the election.