MassDEP DWM Watershed Delineations for use with the MassDEP Integrated List of Waters (305(b)/303(d))
The MassDEP Division of Watershed Management (DWM), Watershed Planning Program (WPP) 2010 Integrated List of Waters (305(b)/303(d)) data layer represents the combined reporting elements for the 2010 cycle of both sections 305(b) and 303(d) of the Federal Clean Water Act (CWA). The objective of this statute is to restore and maintain the chemical, physical, and biological integrity of the Nation’s waters. As one step toward meeting this goal each state must administer a program to monitor and assess the quality of its surface waters and provide periodic status reports to the U.S. Environmental Protection Agency (EPA), the U.S. Congress, and the public. The MassDEP DWM Watershed Delineations are based on the MassGIS Major Basins layer, but modified to reflect surface drainage areas for use with the MassDEP Integrated List of Waters report by the DWM. The DWM has modified certain watersheds for assessment purposes to reflect drainage patterns (for example, a portion of the Cape Cod Watershed Area was changed to reflect its drainage into Buzzards Bay, this change resulted in shape changes for both the Cape Cod and Buzzards Bay Watershed delineations). In general, the watershed name is based on the system that includes all Massachusetts watersheds (based on SARIS). The DWM watershed name Boston Harbor does not appear in the MassGIS list of watersheds; it is used for water body segments that are located in Boston Harbor proper.