Water security, according to the United Nations, is the capacity of a population to safeguard sustainable access to adequate quantities of acceptable quality water for sustaining livelihoods, human well-being and socio-economic development; ensuring protection against water-borne pollution and water-related disasters; and for preserving ecosystems in a climate of peace and political stability. In other words, water security is the ability of a population to access good quality water of suf­ficient quantity necessary for sustaining livelihoods, human well-being and socio-economic development. In the context of cities, urban water security is the ability of an urban population to safeguard sustainable access to adequate supplies of good quality water.