World Water Day is observed on March 22 since 1993. It was declared as such by the United Nations General Assembly. This day was first formally proposed in Agenda of the 1992 United Nations Conference on Environment and Development (UNCED) in Rio de Janeiro, Brazil. Observance began in 1993 and has grown significantly ever since.

The UN and its member nations devote this day to implementing UN recommendations and promoting concrete activities within their countries regarding the world’s water resources. Each year, one of various UN agencies involved in water issues takes the lead in promoting and coordinating international activities for World Water Day.