Without water, there would be no life on Earth. But is there also a human right to water? This volume provides an affirmative answer from the perspective of political philosophy and international law. However, the content and practical significance of this right are problematic. Scholars and practitioners, particularly from development cooperation and human rights work, express their views on this issue. Key topics include the privatization of water supply, especially in developing countries, the medical and development policy necessity of integrated drinking and wastewater management, water as a potential source of interstate conflicts and cooperation, as well as the advantages and dangers of a development policy based on human rights.