The Commission thrives on its worldwide network of experts from multifarious disciplines from 78 countries, who came together in the interest of global water management. All are members contribute to this higher cause by offering their voluntary services. 

Currently, there are two different kinds of membership categories; National Committees and Direct Members.  National Committees (NC) represent their countries mostly through their government departments responsible for irrigation, drainage or agricultural water management. 

Companies, institutions, and individuals can also participate in ICID activities through their respective NCs or as Direct Members (DM). Professionals, individuals and officers of a government or of an institution or institutions - government and non-government; and companies, effectively representing interests within the scope of the objects of the Commission can participate in ICID activities through Direct Membership, to further the objects of the Commission in their countries or sovereign areas.

In the course of our activities and events conducted throughout the world, we associate with many different kinds of NGOs, national governments, researchers, corporate sectors, civil society organizations, and individuals. They are not necessarily members of ICID network but our associates and an important part of ICID fraternity.