This book highlights the work undertaken in the Arsenic contaminated sedimentary aquifers of Central Gangetic plain of India. The presence of elevated levels of dissolved Arsenic in groundwater has endangered lives of millions of people in the Central Gangetic plain. This reconnaissance study was undertaken to highlight the role that aquifer sediments play in groundwater Arsenic contamination. Although there have been different studies that apparently substantiate the role that basin geology, hydrogeology, scale of heterogeneity, and depositional facies have on the hydrogeochemistry and therefore on the distribution of Arsenic in different aquifers of South East Asia. This book will further enhance the understanding of Arsenic in the sedimentary aquifers of Central Gangetic plain.