The federal Clean Water Act requires states to submit reports on the status of their water bodies every 2 years. These reports are called "Integrated Lists of Waters" (ILW). After a public comment period, MassDEP submits these reports to the US Environmental Protection Agency in fulfillment of the Clean Water Act's reporting requirements. MassDEP uses these reports to develop Total Maximum Daily Loads (TMDLs).
Integrated Lists of Waters & Related Reports
Proposed and approved lists of impaired water bodies in Massachusetts.