By World Health Organization (WHO)

Fact 1: World Water Day is celebrated every year on 22 March. The theme for 2007 is ‘water scarcity’. Even in areas with plenty of rainfall or freshwater, water scarcity occurs. Because of the ways in which water is used and distributed, there is not always enough water to fully meet the demands of households, farms, industry, and the environment.
Fact 2: Water scarcity already affects every continent and four of every ten people in the world. The situation is getting worse due to population growth, urbanization and the increase in domestic and industrial water use.
Fact 3: By 2025, nearly 2 billion people will be living in countries or regions with absolute water shortage, where water resources per person fall below the recommended level of 500 cubic metres per year. This is the amount of water a person needs for a healthy and hygienic living.
Fact 4: Water scarcity forces people to rely on unsafe sources of drinking water. It also means they cannot bathe or clean their clothes or homes properly.
Fact 5: Poor water quality can increase the risk of diarrhoeal diseases including cholera, typhoid fever, salmonellosis, other gastrointestinal viruses, and dysentery. Water scarcity may also lead to diseases such as trachoma, plague and typhus. Trachoma, for example, is strongly related to a lack of water for regular face washing.
Fact 6: Water scarcity encourages people to store water in their homes. This can increase the risk of household water contamination and provide breeding grounds for mosquitoes - which are vectors for dengue, dengue haemorrhagic fever, and malaria and other diseases.
Fact 7: Water scarcity underscores the need for better water management. Good water management reduces breeding sites for disease vectors, which leads to reduced transmission of malaria, lymphatic filariasis, schistosomiasis and Japanese encephalitis.
Fact 8 Millennium Development Goal number 7, target 10 aims "to halve, by 2015, the proportion of people without sustainable access to safe drinking water and basic sanitation". The world is still on track to reach the drinking water target, but increasing water scarcity may seriously undermine progress towards achieving this goal.
Fact 9: Everyone needs water and everyone needs to take responsibility. Actively support governments, non-governmental organizations and private foundations which are making it a priority to deliver affordable good quality water to people.
Fact 10: Do your part by conserving, recycling and protecting water more efficiently.