This book examines the antecedents of water usage in the UK and then identifies the key environmental impacts pollution has on a river system. It does this by examining the river system in England and Wales and the regulatory body charged with the management of this river system. The next part of the book focuses on the biological aspects of water pollution, explaining the biological monitoring and surveillance of the river system. This leads to a chapter detaing the main pollutants and their cause and effect on the river system. The final section of the book reviews the laws relating to water pollution and provides a critique of the legislative authorities involved.