De Watergroep maintains close contacts with colleagues in Belgium and abroad. We are a member of various sector organisations and actively participate in numerous working groups and consultative bodies.

De Watergroep is a member of the following organisations:

• Aqua Flanders
• Aqua Publica Europea
• the International Water Association (IWA)
• Belgaqua (Belgian Federation for the Water Sector)
• Eureau
• International Scheldt Commission (ISC) 
• Commissie Landinrichting van het Vlaamse Gewest (Flemish Land Agency)
• Coordination Committee on Integrated Water Policy (CIW)
• Association of River Water Companies (RIWA) 
• MOVI, Network for Management Skills in Flemish Public Institutions
• Flemish Integrated Water Consultation Committee (VIWC) 
• Thematic Network for Wastewater Technology Flanders (TNAV)
• Flemish Water Knowledge Centre (Vlakwa)
• Flanders Eco Cluster
• Belgian Committee for Hydrogeologists (BCH)
• VITO and KWR Water Cycle Research Institute (water technology research)
• Centre for Sustainable Building (Cedubo)
• Kortom (Association for Government Communication)
• Vmx (association for environmental coordination)

De Watergroep is represented or participates in:

• the working groups of the Network for Management Skills in Flemish Public Institutions (MOVI)
• Amelior
• Aqua.Duct
• ISO and BIN 
• Environment Boat
• Environment and Nature Education (MNE)
• Water Energik Vlario (WEL) 
• Belgian Construction Certification Association (BCCA)
• the reservoir committees in Flanders 
• the cross-boundary reservoir committees of Dommel and Thorner-Voer
• Vlario
• Spring uit de band