The evolution of the right to water can be traced to the developments of the early 1970s. This Study analyzes the resolutions and declarations of the various conferences and forums that have been held since that time, and the ways in which they have confronted the issue of the right to water. The Study then discusses the evolution of the international legal regime for the protection and promotion of human rights, and pays particular attention to the Universal Declaration of Human Rights and the International Covenant on Economic, Social and Cultural Rights, as well as to the International Covenant on Civil and Political Rights. The role of each of the committees established to oversee the implementation of the two Covenants is considered in some detail. Particular attention is given to the Committee on Economic, Social and Cultural Rights, its evolution, and its strengthening, and the practice of issuing General Comments. The last two parts of the Study are devoted to General Comment No. 15, which recognizes the human right to water. These parts analyze the extent to which the Comment recognizes a legal right to water, and highlights some policy aspects that are related to, and may affect, this right. The core thesis of this book is that there exists, within the legal framework of the International Covenant on Economic, Social and Cultural Rights, a human right to water because it is a right that inheres in several other rights, and a right without which key provisions of the Covenant would be rendered ineffectual.