The purpose of this book is to create a knowledge base on best practices of fluoride control in drinking water systems from different parts of the world. Presence of high concentrations of fluoride in drinking water is a serious public health issue, causing widespread prevalence of dental and skeletal fluorosis in many parts of the world. The book fills the urgent need for information on the occurrence of fluoride, its health effects, ways of reducing excess levels, and methods for analysis and removal of fluoride in water. This Guide is a part of the series of Best Practice Guide produced by the International Water Association's Specialist Group - Metals and Related Substances in Drinking Water (METRELS).