The U.S. Geological Survey has published a study on uranium content in wells and springs in the Grand Canyon region, but the work is far from over.
The study examined about 200 water sources and found that only a fraction of them had elevated concentrations of uranium. Most were within federal standards for drinking water.
Fred Tillman is a hydrologist who led the project. He said that it’s premature to draw too many conclusions from the report, which was a snapshot of about four decades...