In this chapter:
(1) "District" means a water control and improvement district.
(2) "Board" means the board of directors of a district.
(3) "Director" means a member of the board of directors of a district.
(4) "Commissioners court" means the commissioners court of the county in which a district or part of a district is located.
(5) "Commission" means the Texas Commission on Environmental Quality.
(6) "Executive director" means the executive director of the Texas Commission on Environmental Quality.