Yamuna river is a typical example of degraded ecosystem in Delhi. This book presenting the main reasons of the deteriorating water quality of yamuna river, which is the main source of water supply in Delhi. Sampling of water from different locations and testing of various parameters are included in the details with the standards. Also discussed the major sources of domestic and industrial sewage in to yamuna river. An attempt has been made to make the book useful for useful for everyone. Included the basics steps that required for minimizing the river water pollution with the some recommendations for overall cleaning of river water. With this systematic approach, comprehensive coverage includining data pertaining to indian conditions, the book would be immensly useful to practising environmental engineering.