(1) "Public agency" means any:

(A) School district;

(B) Political subdivision of this state;

(C) Agency of the state government or of the United States;

(D) Political subdivision of another state;

(E) Water district created under the provisions of The Regional Water Distribution District Act, § 14-116-101 et seq.;

(F) Governing body of a municipal electric utility as defined in § 25-20-402; and

(G) Fire department organized under the laws of this state if the fire department:

(i) Offers fire protection services to unincorporated areas; and

(ii) Has received approval by its quorum court for participation in an interlocal cooperation agreement;

(2) "Retail customer" means a person other than a municipality, improvement district, or other entity that:

(A) Sells and distributes water subject to regulation by the Department of Health;

(B) Maintains a service account with a public body formed under the Consolidated Waterworks Authorization Act, § 25-20-301 et seq., for the provision of water to a person or the occupants of a single family dwelling, multi-tenant dwelling, business premises, or government facility; and

(C) Is not explicitly permitted to resell potable water to another person;

(3) "State" means a state of the United States and the District of Columbia;

(4) "Surplus water" means water available for distribution or sale aside from water necessarily required of the public body for distribution to its existing retail customers;

(5) "Wastewater system" means a wastewater and collection system formed under state law that includes without limitation land, mains, interceptors, collector lines, manholes, force mains, valves, pumping stations, pumps, treatment and pretreatment plants and units thereof, other real and personal property, buildings, structures, other improvements, and facilities as necessary or advisable for the proper and efficient operation of the wastewater system; and

(6) "Water system" means and includes a waterworks and distribution system in its entirety, or any integral parts thereof, which is formed under state law and includes without limitation land, mains, pipelines, hydrants, meters, valves, standpipes, storage tanks, storage basins, pumping tanks, intakes, wells, clear water wells, impounding reservoirs, lakes, watercourses, pumps, purification plants and units thereof, filtration plants and units thereof, as well as all other real and personal property, buildings, structures, and other improvements or facilities as necessary or advisable for the proper and efficient operation of the water system.