David Cwiertny of the University of Iowa is an expert in water quality and water resources. He's also one of 35 science and technology experts who've spent the past year working in the U.S. Congress as part of a fellowship program through the American Association for the Advancement of Science. Host Ben Kieffer talks with him about the experience in this edition of River to River. During Cwiertny's time in D.C., the Energy and Commerce Committee passed a bill revising the Safe Drinking Water Act