The Athens Water Supply and Sewerage Company (EYDAP S.A.) was founded in 1980, pursuant to a merger of the incumbent water supplier in Athens and Piraeus “Hellenic Water Company S.A.” (EEY S.A.) and the “Greater Athens Sewerage Organization'” (OAP S.A.). Its current legal form came in 1999, when the Company's main fixed assets, namely dams, reservoirs, external aqueducts and pumping stations, were absorbed by the Company “EYDAP Fixed Assets”, remaining in Greek State ownership.