This 459-page handbook is available in English and Spanish. The target audience includes policy makers and environmental managers in water authorities and engineering companies engaged in water quality programmes, especially in developing countries. It is also suitable for use as a textbook or as training material for water quality management course. High quality fresh water is limited in quantity and there is a need for comprehensive water management involving representatives of all those who use water. Effective management must ensure that the best use is made of available supplies, including protection from pollution, and should seek to limit conflicts over access to fresh water. This calls for the establishment of clearly defined policies and strategies as well as for the development of enforceable mechanisms and tools for water pollution control. This handbook has been prepared by leading international experts addressing specific aspects of water resources management and water pollution control. A series of case studies from various regions is also included, highlighting successful models of wastewater management and pollution control from different parts of the world.