This book is the outcome of more than 10 years research experience of author in the area of ground water pollution. Basic knowledge of water pollution and water quality indicators is absolutely essential for any environmental undergraduate student or any postgraduate student doing research in ground water pollution. Thus it is evident that the basic principles regarding water pollution and their quality indicators form a crucial component of science curriculum at undergraduate and postgraduate level. This book is expected to fill the gap of a much wanted text book on water pollution for the students of B.Sc and M.Sc environmental chemistry.