Athens Water Supply and Sewerage Company (EYDAP SA),

The Athens Water Supply and Sewerage Company (EYDAP SA), is the largest company in Greece operating in the water market. EYDAP SA supplies approximately 4.000.000 inhabitants of Attica with potable water, through an extensive network that includes 1.796.500 metered connections and a total length of 7.940 km. The sewerage sector similarly serves 3.300.000 inhabitants, with a total network length of 5.800 km.

Company details

156, Oropou str. , Athens , 111 46 Greece

Locations Served

Business Type:
Service provider
Industry Type:
Water and Wastewater
Market Focus:
Locally (one state or province)

The Athens Water Supply and Sewerage Company (EYDAP SA) is the largest of its kind in Greece. The Company serves approximately 4,300,000 customers through an extensive network of 2,020,000 water meters and a 9,500 km of water pipes. The sewerage sector serves 3,500,000 residents with sewers spreading at almost 6,000 km.

EYDAP was founded in 1980 under the 'Incorporation of a Single Water Supply and Sewerage Company for Greater Athens' Act 1068/1980 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.).

In 1999, under the 'Issues Related to the Athens Water Supply and Sewerage and other Provisions' Act 2744/1999, EYDAP S.A. took its present legal form, as all of its major assets were transferred to the company 'EYDAP Assets' (Legal Entity under Public Law), thus remaining the property of the State. 'EYDAP Assets' is the owner of dams, reservoirs, water towers, pumping stations and all other facilities that allow water to be transferred safely to treatment plants. Pursuant to an agreement signed by EYDAP S.A. and the Greek State In December 1999, EYDAP S.A. continues to operate the said facilities on behalf of 'EYDAP Assets'.

In January 2000, EYDAP S.A. was listed on the Main Market of the Athens Stock Exchange.

EYDAP’s object is stipulated in Law 2744/1999 and its amendments. The Company’s object is:

  • To provide water supply and sewerage services.
  • To design, construct, install, operate, manage, maintain, expand and upgrade water supply and sewerage systems.
  • To pump, desalinate, process, transfer, store and distribute all kinds of water as a means of serving EYDAP’s object.
  • To implement projects and processes for collecting, transferring, storing, processing as well as
  • To manage and dispose the wastewater treatment products.

EYDAP’s area of service is the greater metropolitan area of Athens, as determined by Law 1068/1980, under which the company has been incorporated. Moreover, under Law 2744/1999, EYDAP has the exclusive right to provide water-supply and sewerage services in the geographical area of its jurisdiction.

It should be also noted that under Law 2744/1999 and the Joint Decision of the Ministers of Economy, Finance, Environment, Physical Planning and Public Works, EYDAP may also expand its operations to other areas within or outside the Attica region. Before each attempted expansion, EYDAP is required to investigate and ensure the feasibility of the effected investment, as well as to secure all necessary funds.

To meet its obligation and provide water-supply services in the greater metropolitan area of Athens, EYDAP obtains, under certain agreements, raw water from adequate resources that belong to the Greek State.