West Ham and the River Lea explores the environmental and social history of London's most populous independent suburb and its second largest river. Jim Clifford maps the migration of industry into West Ham's marshlands and reveals the consequences for the working-class people who lived among the factories. He argues that poverty, pollution, water shortages, and disease stimulated momentum for political transformation, providing an opening for a new urban politics to emerge. This book establishes the importance of the urban environment in the development of social democracy in Greater London at the turn of the twentieth century.