In this chapter:
(1) "Facility" means a facility necessary or incidental to the collection, transportation, treatment, or disposal of sewage or to the conservation, storage, transportation, treatment, or distribution of water, including a plant site, right-of-way, and property, equipment, or right of any kind useful in connection with the collection, transportation, treatment, or disposal of sewage or with the conservation, storage, transportation, treatment, or distribution of water.
(2) "Private entity" means an entity, other than a public entity, involved solely in financing, constructing, operating, or maintaining water and sewer facilities.
(3) "Public entity" means a political entity or corporate body of this state, including a county, municipality, or district or authority created under Section 52, Article III, or Section 59, Article XVI, Texas Constitution, or a water supply or sewer service corporation.