How clean is the Charles?
In 2014 the EPA rated the Charles River an A-. More information is available here.
Organizations involved in cleaning the Charles River
The continuing improvement of the Charles River relies on the efforts of numerous federal, state and local agencies as well as strong participation from citizens, nonprofit groups and private institutions. These entities include:
Massachusetts Department of Conservation and Recreation
Massachusetts Water Resources Authority
Environmental Protection Agency
Charles River Watershed Association
Conservation Law Foundation
Charles River Conservancy
The EPA web site provides a comprehensive history of the Charles River and the ongoing effort to turn it from a polluted river to a swimmable and fishable body of water. The Charles River Watershed Association is the lead private organization in studying and improving the Charles River.