30 Tex. Admin. Code § 304.1
Other than the Rio Grande Water Division, the provisions of this chapter are applicable to each water division created by the commission or watermaster program created by or under Texas Water Code, Chapter 11, each watermaster appointed by the executive director under Texas Water Code, Chapter 11, and to all water rights, permits, authorizations, orders, and any other matters related to water rights within each water division, segments of a water division, or watermaster program. Water rights and matters inside the Rio Grande Water Division are governed by Chapter 303 of this title (relating to Operation of the Rio Grande). All other rules promulgated by the commission are also applicable to the water rights subject to this chapter unless in conflict with the provisions of this chapter, in which event the provisions of this chapter will govern.
30 Tex. Admin. Code § 304.1