Any two or more localities may enter into contracts for the acquisition, construction, maintenance and operation of sewers, pumping stations, ventilation stations, treatment plants or works and any other plants and structures and all appurtenances necessary thereto as the localities deem proper to prevent the pollution of streams, lakes, ponds, bays, estuaries, inlets and other waters within and adjacent to such localities.
Any contract shall also set forth, as nearly as may be ascertainable, the amount of money necessary for the acquisition, construction, maintenance and operation of any works or structures and the part thereof to be provided by each locality.
Va. Code § 15.2-2124