National Water-Quality Assessment (NAWQA) Program
The U.S. Geological Survey (USGS) joins the National Groundwater Association in recognizing March 5-11, 2017, as National Groundwater Awareness week. About half of the nation’s population relies on groundwater for drinking water. As the nation’s population grows, the need for high-quality drinking-water supplies becomes even more urgent. National groundwater-quality assessments are highlighted below. Learn more about USGS assessments of groundwater quantity
The prevalence of potentially corrosive groundwater is rated high to very high in 25 states and the District of Columbia. About 24 million people in these areas rely upon groundwater from private water systems for their source of drinking water. More Information
Comprehensive sampling of water quality in source water from 6,660 wells in regional aquifers is combined with detailed information on geology, hydrology, and geochemistry, and chemcial and water use to explain how and why aquifer vulnerability to contamination varies across the Nation.
An online mapper provides summaries of decadal-scale changes in groundwater quality across the Nation. The mapper shows how concentrations of 24 contaminants, such as nutrients, pesticides, metals, and volatile organic compounds, are changing over decadal periods in 67 groundwater networks. Vew the online mapper