In this chapter:
(1) "Board" means the district's board of directors.
(2) "Commission" means the Texas Commission on Environmental Quality.
(3) "County" means Midland County.
(4) "Director" means a board member.
(5) "District" means the Midland County Utility District.
(6) "Municipality" means a municipality in whose corporate limits or extraterritorial jurisdiction any part of the district is located.