Building on the success of its 1993 predecessor, this 2nd edition of Geochemistry, Groundwater and Pollution has been thoroughly re-written, updated and extended into a complete and authoritative account of modern hydrogeochemistry. Offering a quantitative approach to the study of groundwater quality and the interaction of water, minerals, gases, pollutants and microbes, this book shows how physical and chemical theory can be applied to explain observed water qualities and variations over space and time. Integral to the presentation, geochemical modeling using PHREEQC code is demonstrated, with step-by-step instructions for calculating and simulating field and laboratory data. Numerous figures and tables illustrate the theory, while worked examples including calculations and theoretical explanations aid the reader in gaining a deeper understanding of the concepts involved. This book is intended for students in hydrogeology, geochemistry and civil engineering, while professionals in the water sciences will find inspiration in the practical examples and modeling templates.