In addition to WWAP's UN and national partners, the Programme is also affiliated with a number of varied national, international and regional groups and organizations from all over the world. These affiliates work together in varying degrees with WWAP towards common goals by sharing information, knowledge and know-how in order to complement each other and cover a wide spectrum of water-related issues. Here is a list of the groups and organizations with which WWAP is affiliated:

European Union Water Initiative (EUWI)
Global Water Partnership (GWP)
International Association of Hydrogeologists (IAH)
International Association of Hydrological Sciences (IAHS)
International Programme for Technology and Research in Irrigation and Drainage (IPTRID)
International Sediment Initiative (ISI)
International Union for Conservation of Nature and Natural Resources (IUCN)
International Water Association (IWA)
International Water Management Institute (IWMI)
International Commission on Irrigation and Drainage (ICID)
Public Services International (PSI)
Ramsar Convention on Wetlands
Water Monitoring Alliance
World Water Council (WWC)