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Based on “Water”.

How clean is US groundwater? Researchers remain uncertain

Although the U.S. federal government has monitored the country’s groundwater for the last 30 years, scientists say that only now can they begin to understand long-term pollution in the largest aquifers. The U.S. Geological Survey’s National Water Quality Assessment says concentrations of chloride and sodium are on the increase, and in California, nitrate levels are climbing, according to Circle of Blue.