September 15, 1998: The National Academy of Sciences (NAS) Reporton Radon in Drinking Water “Risk Assessment of Radon in Drinking Water” was released on this date. The report is touted as the most comprehensive accumulation of scientific data on the public health risks of radon in drinking water. The report was required by the Safe Drinking Water Act (SDWA). The NAS report confirmed that radon is a serious public health threat and goes on to refine the risks of radon in drinking water–confirmed that there are drinking water related cancer deaths, primarily due to lung cancer. The report, in general, confirmed earlier EPA scientific conclusions and analyses for drinking water, and presented no major changes to EPA’s 1994 risk assessment.