This book is focused exclusively on water problems in the 48 U.S. states. The authors provide an accessible overview of the work of many federal, state and academic researchers and water system administrators whose investigations have focused on the state of water and the water crisis now accelerating in the United States. David McNabb and Carl Swenson seek to bring to a wider audience some of the current research findings and data on the perilous state of the United States’ surface and groundwater resources during this time of climate change and the extreme drought taking place in many sections of the nation. Descriptions of the water resource systems are based on research and the subsequent findings published by water scientists in the United States Geological Survey, the Environmental Protection Agency, the U.S. Corps of Engineers and water related agencies of the Departments of Agriculture and of the Interior and state and local water management agencies.