Tex. Nat. Res. Code § 61.215

No permit may be issued by the commissioners court under this subchapter to excavate, take, remove, or carry away sand, marl, gravel, or shell from land owned by the state, public beach, or privately owned land that is subject to this subchapter and that is not located on a public beach, unless the applicant is the owner of the land on which the proposed excavating, taking, removing, or carrying away is to take place or unless the applicant is acting with the knowledge and consent of the owner.