The Environmental Protection Agency has given a preliminary green light to ban all vessels from dumping sewage in Puget Sound. It’s the latest step in a long effort by the state and environmental groups. Washington’s Department of Ecology has been working for several years to get a federal ban on sewage dumping for Puget Sound and issued a formal petition requesting it this summer . The EPA has established more than 90 of these so-called “no discharge” zones in 26 states, but this would be the