Alternative water sources are expected to play a significant role in areas suffering water shortages. In many places waste water reuse is becoming a valuable component of sustainable water management practises. Substantial and practical information is needed to safely design, implement and operate waste water reuse schemes.The project AQUAREC Integrated concepts for reuse of upgraded wastewater was funded by the Fifth Framework Programme of the European Commission. Its major aim was to investigate and develop concepts and methodologies supporting rational and knowledge-based waste water reuse strategies.This publication presents practical information on waste water reuse concepts based on actual and proved management and operational practises. A broad approach has been considered by addressing institutional, organisational, legal, economics, financial, social and environmental issues together with technological aspects.