Now days, in Athens and Thessaloniki there are three public companies responsible for the water supply and sewerage. Their main characteristics are that the state is the only shareholder , appoints their board of management and are funded by the State.

In the rest of the country and especially in the cities with more than 10.000 inhabitants there are municipal enterprises.

These companies are abbreviated as DEYA and have undertaken the drinking water supply and the collection and treatment of urban waste water.

In small cities the water and sewage service is part of the municipal service. There are also intercommunity associations which manage the water service for their communities.