WOBURN iTONEHAM ' - WINCHESTER LEXINGTON MALDEN MEDFORD ARLINGTON CHELSEA SOMERVILLE BELMONT CAMBRIDGE WINTHROP WILMINGTON WAKEFIELD BURLINGTON Grade Water Segment Average Compliance Rate A+ A Upper Mystic Lake Island End River 98.56% 91.67% B+ Chelsea River 83.28% B+ B+ B- B- Mystic River (Salt) Mystic River (Fresh) Meetinghouse Brook Belle Isle Inlet 81.43% 80.39% 72.50% 70.29% C C- Aberjona River Maiden River 64.37% 59.44% D+ Mill Brook 54.71% D+ Little River 52.56% D Alewife Brook 46.69% D Winns Brook 45.29% F Mill Creek 30.20% REVERE WATERTOWN Mystic River Watershed Water Quality reading Grades and Compliance Rates - Calendar Year 2021 Average Compliance Rates for Swimming and Boating Standards 100-86 85-71 70-56 55-40 Monitoring Points (fj) Mystic River Watershed Association A Massachusetts Water Resources Authority A B c D F 39-0 Mystic River Watershed Town Boundary 2021 Mystic River Watershed Report Card (based on 2019-2021 bacterial data) Data Sources: Mystic River Watershed Association, U.S. EPA, Massachusetts Water Resources Authority, MassGIS. Basemap: Canvas/World Light Gray Base © ESRI and its data suppliers. EPA Region 1 GIS Center map #13390, 7/14/2022 ------- |