Within 90 days after the board has finally approved the terms and conditions of annexation, the board shall cause an election to be held in the territory proposed to be annexed to determine whether the territory shall be annexed to the district upon the terms and conditions stated in the ordinance.

Notice of election shall be published and shall either state that a copy of the ordinance containing the terms and conditions of annexation at length is on file in the office of the secretary of the district, and open to the inspection of all persons interested, or set forth the terms and conditions of annexation at length, in the discretion of the board.

The ballots for the election shall contain substantially the instructions required to be printed on ballots for use at general state and county elections and in addition shall set forth the proposition of annexation substantially as follows:

In the event that no unincorporated territory shall have been included in the original formation of the district, an election shall be held concurrent with the first annexation election of unincorporated territory for the purpose of selecting one board member for the district in the event the annexation is successful. The initial member elected to represent the unincorporated territory on the board of directors shall serve until a successor is elected at the next succeeding election of directors within the unincorporated territory and qualifies.

If upon a canvass of the election it is found that a majority of all votes cast on the proposition at the election were cast in favor of the annexation, the proposition and all of the terms and conditions set forth in the ordinance shall be deemed carried and approved by the voters.

If the proposition fails to carry, the result shall be entered upon the minutes of the board.

If the proposition is defeated by the voters, no annexation proceeding shall be commenced involving the territory or any part thereof until after the expiration of one year.