(a) Not later than the 30th day after the date of the public hearing, the county clerk shall tally the returned ballots and declare the results to the commissioners court.
(b) If a majority of returned ballots are in favor of the improvement and assessment, the commissioners court shall order the improvements and assess the costs of the improvements against the real property owners of the subdivision or part of the subdivision.

(c) If the proposition fails, the commissioners court may not:
(1) order the improvement and assessment; or
(2) again propose the improvement and assessment before the fourth anniversary of the date the county clerk declares the results of the vote to the commissioners court.