Thessaloniki Water Supply & Sewerage Co S.A., doing business as EYATH S.A., provides water supply and sewerage services in Greece. The company engages in the design, construction, installation, operation, utilization, management, maintenance, extension, and renewal of water supply and sewerage systems. Its activities include projects, such as desalination, pumping, treatment, storage, transport, distribution, and management of various types of water, as well as the collection, transport, treatment, storage, and management of waste. The company also offers telecom services; and generates and sells electricity by utilizing water from springs, dams, aqueducts, and pipelines. The company was founded in 1998 and is headquartered in Thessaloniki, Greece. Thessaloniki Water Supply & Sewerage Co S.A. is a subsidiary of Hellenic Corporation of Assets and Participations S.A.