A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater quality across the Nation.
About 140 million people—almost one-half of the Nation’s population—rely on groundwater for drinking water. Tracking changes in groundwater quality and investigating the reasons for these changes is crucial for informing management decisions to protect and sustain our valuable groundwater resources
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 across the Nation. Each network consists of about 20 to 30 wells selected to represent water-quality conditions in a given geographical area, aquifer, and in some cases, a specific land use.