California Code, Public Resources Code - PRC § 5520

The election returns shall be forwarded to the board of supervisors of the county having the largest area within the proposed district at the conclusion of the canvass, pursuant to Section 15372 of the Elections Code.  At the next meeting after the receipt of the election returns, the board shall certify the results of the election.  If a majority of those who have voted on the proposition vote in favor of the creation of the district the board of supervisors shall order and declare the district created.

If it appears from the canvass that a majority of the electors voting at the election have voted against the formation of the district, the proceedings fail entirely, and there shall be no similar proceedings instituted within that territory within six months from the date of the election.