Texas Water Code - WATER § 36.053. Quorum

(a) Except as provided by Subsection (b), a majority of the membership of the board constitutes a quorum for any meeting, and a concurrence of a majority of the entire membership of the board is sufficient for transacting any business of the district.

(b) For the purposes of making a final decision on a permit or permit amendment application by a board composed of 10 or more directors, a concurrence of a majority of the directors eligible to vote is sufficient for taking an action on the application.