In this subchapter:
(1) "Fund" means the plumbing loan fund.
(2) "Plumbing assistance loan" means a loan provided by the board to a political subdivision for the political subdivision's plumbing improvement loan program.
(3) "Plumbing improvement loan" means a loan provided by a political subdivision to an individual under this subchapter.
(4) "Political subdivision" means a county, a municipality, a nonprofit member-owned, member-controlled water supply corporation organized and operating under Chapter 67, or a district or authority created and operating under Article III, Section 52, or Article XVI, Section 59, of the Texas Constitution.
(5) "Water conservation" has the meaning assigned by Section 17.921 of this code.