This 311-page document is available in English and Spanish. The intended audience includes entry through intermediate level public health professionals, environmental health specialists, those concerned with monitoring and assessing recreational waters, including field staff. It will also be useful for national and regional government departments concerned with tourism and recreation, and for students and special interest groups. This book, which has been prepared by an international group of experts, provides comprehensive guidance for the design, planning and implementation of assessments and monitoring programmes for water bodies used for recreation. It addresses the wide range of hazards that may be encountered and emphasizes the importance of linking monitoring programmes to effective and feasible management actions to protect human health. It also provides details of sampling and analytical methods.