Tex. Water Code § 13.251

Except as provided by Section 13.255, a utility or a water supply or sewer service corporation may not sell, assign, or lease a certificate of public convenience and necessity or any right obtained under a certificate unless the utility commission has determined that the purchaser, assignee, or lessee is capable of rendering adequate and continuous service to every consumer within the certified area, after considering the factors under Section 13.246(c). The sale, assignment, or lease shall be on the conditions prescribed by the utility commission.