If at the election a majority of the voters voting upon the proposition vote in favor of the formation of the district the county legislative authority shall so declare in its canvass of the returns of the election to be made within ten days after the date of the election, and the district shall then be and become a municipal corporation of the state of Washington, and the name of the district shall be the name of the district as provided in the petition and the ballot.
The county's expenses incurred in the formation of the district, including the election costs associated with the ballot proposition authorizing the district, election of the initial commissioners under RCW
57.12.030, and the ballot proposition authorizing the excess levy, shall be repaid to the county if the district is formed.