As used in this chapter, “enterprise” means systems, plants, works, or undertakings used or useful in the collection, treatment, and disposal of waste, refuse, and garbage, or of sewage, waste, and storm water. It includes all parts of any such enterprise and all appurtenances to it, and lands, easements, rights in land, contract rights, franchises, approaches, dams, garbage trucks, equipment, dumps, garbage disposal plants and incinerators or other disposal facilities, sewage treatment plants, sewage disposal plants, intercepting and collecting sewers, outfall sewers, trunk connecting, and other sewer, waste, and storm water mains.