For the purpose of this act, unless a different meaning clearly appears from the context, the following terms shall be ascribed the following meanings:
(1) The term “works” shall include water systems and sewerage systems;
(2) The term “water system” shall include reservoirs, storage facilities, water mains, conduits, aqueducts, pipelines, pumping stations, filtration plants, and all appurtenances and machinery necessary or useful for obtaining, storing, treating, purifying or transporting water for domestic uses or purposes;
(3) The term “sewerage system” shall include intercepting sewers, outfall sewers, force mains, collecting sewers, pumping stations, ejector stations, treatment plants, structures, buildings, machinery, equipment, connections and all other appurtenances necessary, useful or convenient for the collection, transportation, treatment, purification, and disposal of the sewage of any district;
(4) The term “district” shall mean water and/or sewer districts and/or water or sewer subdistricts.