DEP 2002 Integrated List of Waters (305(b)/303(d)) (Polygons)
Under Massachusetts General Law (MGL) chapter 21 DEP is responsible for monitoring the waters of the Commonwealth, identifying those waters that are impaired, and developing a plan to bring them back into compliance with the Massachusetts Surface Water Quality Standards. The list of impaired waters, better known as the "303d list," identifies river, lake, and coastal waters and the reasons for impairment.
Once a water body is identified as impaired, DEP is required by the Federal Clean Water Act to essentially develop a "pollution budget" designed to restore the health of the impaired water body. The process of developing this "pollution budget", generally referred to as a Total Maximum Daily Load (TMDL), includes identifying the causes (types of pollutant) and source(s) (where the pollutants come from) of the pollutant from direct discharges (point sources) and indirect discharges (non-point sources), determining the maximum amount of the pollutant that can be discharged to a specific water body to meet water quality standards, and developing a plan to meet that goal.
The Massachusestts Department of Environmental Protection's Division of Watershed Management (DWM), Watershed Planning Program (WPP) 2002 Integrated List data layer represents estuary, lake and river segments assessed and summarized in the 2002 Report to Congress made under sections 305(b) ("Water Quality Inventory") and 303(d) of the Federal Clean Water Act. This report, "Massachusetts Year 2002 Integrated List of Waters", can be found at http://www.mass.gov/dep/brp/wm/tmdls.htm.
The Integrated List data layer, named after the Water Body System (WBS) database upon which it was based, comprises two features classes, WBS2002_POLY for polygon features (lakes, ponds, and estuaries), and WBS2002_ARC for linear features (rivers, streams, and estuaries).