Texas Water Code - WATER § 62.111. Award of Contract

(a) All contracts for improvements, except those carried out and performed by the government of the United States, shall be awarded by the commission to the lowest and best responsible bidder.

(b) Nothing in this section shall prevent the making of more than one improvement.  Where more than one improvement is to be made, a contract may be awarded separately for each improvement or one contract may be awarded for all the improvements.