Wyo. Stat. Ann. § 15-7-501

As used in this article, "sewerage system" means a sewerage treatment plant, or plants, collecting, intercepting and outlet sewers, force mains, conduits, pumping stations, ejector stations and all other appurtenances or improvements, or any of them, necessary or useful and convenient for the collection, treatment and disposal, in a sanitary manner, of sewage and industrial wastes.