Nearly 30 million people are living in areas of the US with limited water supplies as the country faces growing concerns over both water availability and quality, according to a new assessment by government scientists. The US Geological Survey (USGS), which is part of the Department of the Interior, issued what it said was a first-of-its-kind report last week, with USGS Director David Applegate warning of “increasing challenges to this vital resource.” The Jan. 16 report, based on data from 2010 to 2020, examines not only water supplies but also demand patterns and water quality. The report showed that most of the country had supplies that exceeded demand during the period examined, but worrisome trends were noted.