Here's some good news about the condition of the Potomac River. The Washington Post reports that the Potomac is cleaner now than it was in the 1950s. One of the main reasons behind the turnaround in the condition of the river is improvements made at the Blue Plains Advanced Wastewater Treatment Plant, located at the southern tip of the city. Tomorrow at 11am, there will be a press conference held jointly by DC Water and the Environmental Protection Agency (EPA) to announce the re issuance of an operating permit for the plant. According to the press release, DC Water and EPA officials will discuss the requirements of the new permit, as well as the progress that has been made in the region over the past 25 years to help improve water quality.