In order to accomplish its aims and objectives, EDEYA cooperates with organizations and institutions in national and European level.

• With the responsible for water and Sewerage ministries and organizations (KEDKE, EETAA)
• With EYDAP and EYATH
• With EUREAU (Εuropean Union of National Associations of Water Suppliers). EDEYA is a member of EUREAU
• With national and international scientific organizations and institutions which work in water - sewerage and water management areas.
• With EEDE in the areas of training and planning.