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. It inspired the creation of our EarthSayers special collection around the idea of "One Water." It addresses a wide range of issues including, but not limited to water supply, security, rights, and pollution.
The organization, One Water, puts the challenge succinctly: "Providing clean and safe water to everybody around the world is among the greatest challenges facing us today." Two other organizations asking for support are charity:water and water.org.