Tex. Health & Safety Code § 437.0056

The executive commissioner may adopt rules for the efficient enforcement of this chapter by the department in an area not regulated under this chapter by a county or public health district. The executive commissioner by rule shall establish minimum standards for granting and maintaining a permit in an area not regulated under this chapter by a county or public health district. The commissioner may refuse an application for a permit or suspend or revoke a permit in an area not regulated under this chapter by a county or public health district.