(a) The district is composed of the territory described by Subsection (b) and Section 1, Chapter 523, Acts of the 54th Legislature, Regular Session, 1955 (Article 8280-189, Vernon's Texas Civil Statutes), as that territory may have been modified under:
(1) Subchapter J, Chapter 49, Water Code;
(2) Subchapter O, Chapter 51, Water Code, before September 1, 1995;
(3) former Section 4A, Chapter 523, Acts of the 54th Legislature, Regular Session, 1955 (Article 8280-189, Vernon's Texas Civil Statutes); or
(4) other law.
(b) Effective September 1, 2019, the territory of the district includes the following areas as those areas are legally described on that date:
(1) the territory inside the corporate boundaries of:
(A) the City of Harker Heights;
(B) the City of Copperas Cove;
(C) the City of Belton; and
(D) the City of Killeen;
(2) the service area of the 439 Water Supply Corporation;
(3) the territory of the Bell County Water Control and Improvement District No. 3; and
(4) the Bell County portion of the Fort Hood Military Reservation.