Tex. Nat. Res. Code § 91.701

The owner or operator of any well subject to the jurisdiction of the commission under this title, Section 26.131, Water Code, or Subchapter C, Chapter 27, Water Code, shall secure from the commission a certificate showing compliance with that title, section, or subchapter, as applicable, rules adopted and orders issued under that title, section, or subchapter, as applicable, and any license, permit, or certificate issued to the owner or operator under that title, section, or subchapter, as applicable.