Road Salt in the Washington DC Metro Area (IMAGE) Proceedings of the National Academy of Sciences Caption This image shows road salt in the Washington DC metro area, which can be transported in urban runoff to rivers and drinking water sources. Credit Image courtesy of Joseph Galella (University of Maryland, College Park, MD). Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.