Mystic River Watershed Water Quality
Grades and Compliance Rates - Calendar Year 2019
WAKEFIELD
BURLINGTON
WOBURN
STONEHAM
WINCHESTER
LEXINGTON
MALDEN
MEDFORD
ARLINGTON
SOMERVILLE
BELMONT
CAMBRIDGE
Grade Water Segment
Average
Compliance Rate
WILMINGTON
A
Upper Mystic Lake
92.9%
A
Chelsea River
90.4%
A-
Mystic River (Fresh Water)
85.5%
B+
Belle Isle Inlet
83.8%
B+
Mystic River (Salt Water)
83.8%
B
Island End River
76.3%
B-
Meetinghouse Brook
72.6%
C
Maiden River
63.9%
C-
Aberjona River-
55.7%
D+
Little River
50.7%
D+
Mill Brook
50.5%
D
Alewife Brook
45.6%
D-
Mill Creek
41.3%
F
Winns Brook
36.3%
REVERE
WATERTOWN
Average Compliance Rates for Swimming and Boating Standards
¦¦ [ B 1
c
70-56
Monitoring Points
Q Mystic River Watershed Association
/\ Massachusetts Water Resources Authority
Mystic River Watershed
~ Town Boundary
2019 Mystic River
Watershed Report Card
(based on 2017-2019 bacterial data)

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