Athens Water Supply and Sewerage Company (EYDAP SA) is principally engaged in the business of water distribution, sewerage and waste-water treatment. It is one of the largest companies in Greece operating in the water market. The company is involved in the provision of water and sewerage services, as well as the design, construction, installation, operation, utilization, management, maintenance, expansion and renewal of water supply and sewerage systems. The Company also carries out pumping, desalination, treatment, storage, transfer and distribution of all kinds of water, as well as works and procedures of collection, transfer, storage, treatment and the management and distribution of the waste treatment products. It operates two wastewater treatment plants located at Metamorfosi and Psittalia treating cesspool waste for Attica and sewage from its northern suburbs. The company also operates and installed two small hydroelectric plants and two new hydroelectric power stations. The company is headquartered in Athens, Greece.