The degradation of water bodies as a result of human activities is known as water pollution. It occurs when contaminants enter the natural environment. These contaminants can cause widespread disease and even death in humans through water-borne diseases. Water pollution can be caused by either point sources or non-point sources. The sources which have one recognizable reason of pollution are known as point sources. The non-point sources are relatively more diffused. The measurement of water pollution can be done by conducting chemical, physical or biological tests. Some of the various types of water pollution are groundwater pollution, surface water pollution and marine pollution. The topics included in this book on water pollution are of utmost significance and bound to provide incredible insights to readers. Different approaches, evaluations, methodologies and advanced studies on this field have been included in this book. The book is appropriate for students seeking detailed information in this area as well as for experts.