Bruce D. Lindsey Kenneth Belitz Jeannie Barlow 2016 <p>Groundwater provides nearly 50 percent of the Nation’s drinking water. To help protect this vital resource, the U.S. Geological&nbsp;Survey (USGS) National Water-Quality Assessment (NAWQA) Project assesses groundwater quality in aquifers that are&nbsp;important sources of drinking water. The Southeastern Coastal Plain aquifer system&nbsp;constitutes one of the important areas being evaluated.&nbsp;One or more inorganic constituents with human-health benchmarks were detected at high concentrations in about 6 percent of the study area and at moderate concentrations in about 13 percent.&nbsp;One or more organic constituents with human-health benchmarks were detected at moderate concentrations in about 3 percent of the study area.</p> application/pdf 10.3133/fs20163076 en U.S. Geological Survey Groundwater quality in the Southeastern Coastal Plain aquifer system, southeastern United States reports