UN-Water is made up of Members that are UN agencies, programmes and funds with a water-related mandate are of UN-Water, and Partners who are international organizations, professional unions, associations or other civil-society groups that are actively involved in water and that have the capacity and willingness to contribute tangibly to the work of UN-Water. Members and Partners work together to inform water and sanitation policies, monitor and report on progress, and coordinate two annual global campaigns on World Water Day and World Toilet Day.
In 2017 the Chair of UN-Water was British-born Guy Ryder who was also the Director-General of the International Labour Organisation in Geneva.
Every year, UN-Water coordinates the United Nations international observances on freshwater and sanitation. Depending on the official UN theme of the campaign, they are led by one or more UN-Water Members and Partners with a related mandate.