Tex. Water Code § 13.144
A district or authority created under Section 52, Article III, or Section 59, Article XVI, Texas Constitution, a retail public utility, a wholesale water service, or other person providing a retail public utility with a wholesale water supply shall provide the utility commission and the commission with a certified copy of any wholesale water supply contract with a retail public utility within 30 days after the date of the execution of the contract. The submission must include the amount of water being supplied, term of the contract, consideration being given for the water, purpose of use, location of use, source of supply, point of delivery, limitations on the reuse of water, a disclosure of any affiliated interest between the parties to the contract, and any other condition or agreement relating to the contract.
Tex. Water Code § 13.144