The Deer Island Wastewater Treatment Plant is located on Deer Island in Boston Harbor, Massachusetts. It is a key facility for treating wastewater from the Greater Boston area, serving over 2 million residents. The plant uses advanced technologies to remove pollutants and ensure that treated water is safe for discharge into the ocean. Constructed in the 1990s, the plant plays a vital role in protecting the environment and public health. It features a large treatment capacity and employs various processes, including biological treatment and filtration, to effectively manage sewage and stormwater. The facility is part of the Massachusetts Water Resources Authority's efforts to maintain clean waterways.