James A. Kingsbury 2018 <p>Groundwater provides nearly 50 percent of the Nation’s drinking water. To help protect this vital resource, the U.S. Geological Survey (USGS) National Water-Quality Assessment (NAWQA) Project assesses groundwater quality in aquifers that are important sources of drinking water (Burow and Belitz, 2014). The Mississippi embayment–Texas coastal uplands aquifer system constitutes one of the important aquifer systems being evaluated.</p> application/pdf 10.3133/fs20183067 en U.S. Geological Survey Groundwater quality in the Mississippi embayment–Texas coastal uplands aquifer system, south-central United States reports