More than one billion people do not have access to an adequate water supply. In Gambia and Haiti, people live on less than 4 liters of water per day. By contrast, most toilets in the West use several times that amount of water for a single flush. The global distribution of water is making it increasingly difficult for poor people to access it, and movements to commodify water and privatize the industries that provide it exacerbate this situation, trapping the poorest in a cycle of water poverty. Much research has been done on the problem of water scarcity. However, the link between scarcity and water as a human right is rarely articulated, even the current index of the website of the United Nations High Commissioner for Human Rights has no entry for water. This paper proposes a human right to water. It then considers the consequent obligations the right to water imposes on those who control water resources, such as governments, water corporations, and international lending institutions. (Contains 75 notes.)