Water is nature's free gift to the human race and is an essential constituent of all animal and vegetable matter. This book presents the essential aspects of water pollution in a clear, straightforward and simple manner and in an easy to understand language. Figures and tables have been liberally added to explain the concepts lucidly. This is a valuable textbook for all students and teachers of environment, engineering, life sciences and allied courses. In addition, researchers in water pollution management environmental and allied fields will also find it highly useful and informative. The book is a complete treatise on water pollution and also includes common effluent treatment plant which has attracted a great deal of opprobrium on account of its poor record in the management of liquid and solid wastes.