“After nearly three decades of groundwater monitoring, the federal government’s foremost Earth science agency has collected enough data to begin identifying long-term pollution trends in the country’s largest aquifers. A few trends, that is, but not many.
Two clear patterns that the U.S. Geological Survey’s National Water Quality Assessment found are that concentrations of chloride and sodium are climbing nationally, while in farm regions in California and southern Georgia, nitrate levels have increased. … ”
Read more from Circle of Blue here: Is U.S. Groundwater Quality Getting Better or Worse? It’s Hard to Say