(a) The authority is composed of portions of Cooke, Denton, Montague, and Wise Counties as described by Sections 2 and 2a, Chapter 372, Acts of the 56th Legislature, Regular Session, 1959 (Article 8280-234, Vernon's Texas Civil Statutes), as that territory may have been modified under:
(1) Subchapter O, Chapter 51, Water Code, before September 1, 1995;
(2) Subchapter J, Chapter 49, Water Code; or
(3) other law.
(b) An error or discrepancy in the field notes of the authority's boundaries contained in Section 2, Chapter 372, Acts of the 56th Legislature, Regular Session, 1959 (Article 8280-234, Vernon's Texas Civil Statutes), does not affect the validity of the authority or any of its powers.
(c) Territory in the authority that is annexed by a municipality on or after January 1, 2009, remains in the authority.