Tex. Water Code § 13.252

If a retail public utility in constructing or extending a line, plant, or system interferes or attempts to interfere with the operation of a line, plant, or system of any other retail public utility, or furnishes, makes available, renders, or extends retail water or sewer utility service to any portion of the service area of another retail public utility that has been granted or is not required to possess a certificate of public convenience and necessity, the utility commission may issue an order prohibiting the construction, extension, or provision of service or prescribing terms and conditions for locating the line, plant, or system affected or for the provision of the service.