California Code, Public Utilities Code - PUC § 29167

At any special bond election called pursuant to this part, all residents of the district who are qualified electors possessing the qualifications prescribed by the general election laws of the State of California shall be entitled to vote thereat.  All special bond elections shall be held and conducted as nearly as practicable in accordance with the general laws of the State of California, including provisions with respect to voting by absent voters, but the requirements as to the form of ballots need not apply except to the extent adopted by the board.  Whether a resident of the district is a qualified elector within the district shall be conclusively determined by the last great register of voters of the county or portion of the county in which the election is held.  Except when the special bond election is consolidated with any other election, the board shall designate the hours during which the polls shall be kept open.  The polls shall not be opened before 7 a.m. nor kept open later than 8 p.m. and shall be kept open for not less than four hours.