Delaware's beaches have been recognized for the cleanest water quality in the nation, with Rehoboth and Dewey recognized as two of the country's 13 "Superstar Beaches" for their perfect swimming water quality according to the Natural Resources Defense Council (NRDC).  The non-partisan international environmental advocacy group annually assesses all beaches in 30 coastal states. The NRDC also recognized the Recreational Water Quality Testing Program of the Delaware Department of Natural Resources and Environmental Control (DNREC) as one of the most comprehensive in the nation.