The General Assembly and the IAWR Presidium consist of the presidents and managing directors of the member associations.

The Scientific Coordination Committee (IAWR Advisory Board) supports the Presidium and the Executive Board. It is composed of representatives of the scientific advisory boards of the member associations.

The IAWR Advisory Board can form ad hoc working groups on individual issues in the fields of analytics, biology or technical issues of water policy.

With the IAWR Platform Analytics, the IAWR has a working group for the exchange of information on new measurement methods and new or not yet identified substances in water bodies.

The IAWR's working methods are laid down in statutes and rules of procedure.

"The committees and working groups are staffed by experts delegated from the member associations AWBR, ARW and RIWA-Rhine."