About half of the U.S. population relies on groundwater for drinking water. The United States Geological Survey is responsible for the National Water Quality Assessment Project, assessing water-quality conditions and whether these conditions are improving or deteriorating over time.
The results of these changing conditions are available in a new USGS interactive map, A Decadal Look at Groundwater Quality. The map shows the concentrations of pesticides, nutrients, metals, and organic contaminants in groundwater and how these have changed over ten years.
Using the map you can select to view the test results for a large number of organic and inorganic constituents. Scaled arrow markers on the map indicate whether the tested aquifers showed an increase or decrease in the selected constituent between the decadal testing. For example, if you select to view the results for chlorine, the arrow markers on the map show that most wells tested have shown an increase in chlorine over the ten years between the two latest tests.
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