- 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.