The international observance of World Water Day is an initiative that grew out of the 1992 United Nations Conference on Environment and Development (UNCED) in Rio de Janeiro.

The United Nations General Assembly designated 22 March of each year as the World Day for Water by adopting a resolution.This world day for water was to be observed starting in 1993, in conformity with the recommendations of the United Nations Conference on Environment and Development contained in chapter 18 (Fresh Water Resources) of Agenda 21.

'Coping with Water Scarcity' is the theme for World Water Day 2007, which is celebrated each year on 22 March. This year's theme highlights the increasing significance of water scarcity worldwide and the need for increased integration and cooperation to ensure sustainable, efficient and equitable management of scarce water resources, both at international and local levels.

Equity and rights, cultural and ethical issues are essential to be addressed when dealing with limited water resources. Imbalances between availability and demand, the degradation of groundwater and surface water quality, intersectoral competition, interregional and international disputes, all center around the question of how to cope with scarce water resources.