EYDAP
Corporate brand
UnclaimedEYDAP is Greece's principal water-supply and sewerage company, serving the metropolitan Athens area.
Last updated August 26, 2026
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Overview
EYDAP, formally the Athens Water Supply and Sewerage Company, is a Greek utility responsible for supplying drinking water and providing sewerage services in the metropolitan Athens area. Its Greek name is Eteria Ydrefsis ke Apohetefsis Protevusas, commonly abbreviated as EYDAP or written in Greek as ΕΥΔΑΠ. The company is based in Galatsi, Athens, and is described as the largest Greek enterprise in its sector. The company was created in 1980 through the merger of two existing public water organizations: the Hellenic Water Company, known in Greek as the Ελληνική Εταιρεία Υδάτων or EEY, and the Greater Athens Sewerage Organization, known as OAP. The merger combined responsibility for the capital region's water supply and sewerage infrastructure under one organization. This institutional structure made EYDAP a central provider of essential urban services in and around Athens. EYDAP's operating role covers both sides of the urban water cycle. It supplies fresh water to approximately 4.3 million customers in the metropolitan area and provides sewerage services to approximately 3.5 million customers. These figures place the company at the center of daily household, commercial, and public-service water provision in the Athens region. The available reference material does not provide a detailed breakdown of treatment facilities, network assets, tariff categories, or customer segments, so those aspects are not described here as separate business lines. The Greek state retains majority ownership, while a further 27% of the company is listed on the Athens Exchange. EYDAP is included among the 25 companies forming the FTSE/Athex Large Cap index. Its ownership structure therefore combines public control with a substantial publicly traded minority interest. No ticker symbol is supplied in the available material. EYDAP became an important subject of Greek public-policy debate during the government-debt crisis and the privatization program associated with the Eurozone Memorandum. The company was planned for full privatization, including the proposed transfer of the government's stake to the Hellenic Republic Asset Development Fund. In May 2014, however, the Greek Council of State blocked that transfer. The constitutional court determined that selling the government's stake in this manner would be unconstitutional. The decision prevented the planned privatization route and preserved the state's majority position at that stage. After the ruling, a possible merger between EYDAP and the Thessaloniki Water Supply & Sewage Company, or EYATH, was considered. The reference material does not establish that such a merger occurred. EYDAP therefore remains identifiable primarily as a state-controlled, Athens-focused water and sewerage utility rather than as a diversified consumer brand. Its public identity is closely tied to the provision of essential infrastructure, the management of metropolitan water and sewerage services, and the continuing policy question of how strategic water utilities should be owned and governed in Greece.
History
EYDAP was established in 1980 through the merger of the Hellenic Water Company and the Greater Athens Sewerage Organization. The combination brought Athens's water-supply and sewerage responsibilities into a single enterprise and created the organization now known as the Athens Water Supply and Sewerage Company. From its formation, EYDAP served the metropolitan Athens area, providing drinking water and sewerage services to a large urban population. Its headquarters are in Galatsi, in the Athens metropolitan area. The company is described as Greece's largest enterprise in the water-supply and sewerage sector. Its service footprint includes approximately 4.3 million fresh-water customers and approximately 3.5 million sewerage customers. EYDAP's ownership and governance became particularly significant during the Greek government-debt crisis. Under the terms of the Eurozone Memorandum, the Greek government planned to fully privatize the company by transferring its stake to the Hellenic Republic Asset Development Fund. The plan reflected the broader privatization program applied to Greek state assets during the crisis. In May 2014, the Greek Council of State blocked the proposed transfer. The constitutional court found that the sale would be unconstitutional, preventing the planned movement of the government's stake into the privatization fund. The ruling was consequential for the company's ownership model because the Greek state retained majority control rather than proceeding with the proposed privatization route. Following the decision, a possible merger with the Thessaloniki Water Supply & Sewage Company, EYATH, was considered, although the available reference does not state that a merger was completed. EYDAP also has a public-market presence. While the Greek state holds the majority stake, approximately 27% of the company is listed on the Athens Exchange. The company is included in the FTSE/Athex Large Cap index, which places it among the 25 companies represented in that benchmark. Its structure thus combines public ownership, listed-market participation, and responsibility for essential metropolitan infrastructure. The available material does not document later ownership changes, executive appointments, detailed infrastructure projects, financial results, or a completed combination with EYATH. Accordingly, the documented history is centered on EYDAP's 1980 creation, its role as Athens's major water and sewerage provider, its listed status, and the 2014 constitutional ruling that halted the proposed privatization transfer.
- 2014
Privatization transfer is blocked
[1]The Greek Council of State rules that transferring the government's EYDAP stake to the Hellenic Republic Asset Development Fund would be unconstitutional.
- 1980
EYDAP is established
[1]The Hellenic Water Company and the Greater Athens Sewerage Organization merge to form EYDAP.
Products and positioning
A state-controlled metropolitan utility providing essential drinking-water and sewerage infrastructure for Athens.
Water utility service · 1980
Fresh-water supply
EYDAP supplies fresh water to customers across the metropolitan Athens area. The reference material identifies approximately 4.3 million customers for this service. No further product-level information, such as tariff structures, treatment methods, or named consumer programs, is provided.
Wastewater utility service · 1980
Sewerage services
EYDAP provides sewerage services throughout its metropolitan Athens service area. Approximately 3.5 million customers are identified as receiving sewerage services. The service reflects the company's inherited responsibility from the Greater Athens Sewerage Organization and its continuing role as an urban wastewater utility.
Brand decisions
2014
Challenge to planned privatizationStrategyBackground
During the Greek debt crisis and the privatization program associated with the Eurozone Memorandum, the government planned to transfer its EYDAP stake to the Hellenic Republic Asset Development Fund for full privatization.
Action taken
The Greek Council of State blocked the proposed transfer in May 2014, ruling that the sale would be unconstitutional. A possible merger with EYATH was then considered.
Aftermath
The planned transfer to the privatization fund did not proceed on the basis described in the reference material, leaving the Greek state as the majority holder at that stage. The reference does not confirm that an EYDAP–EYATH merger took place.
Sources1 sources
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