Vnaijii'J

QUINCY

Mo/

MILTON

WESWOOD

NORWOOD*

MEDFIELD

'CANTON

qui d Brook

f Wilie t Pond

j Turner Emid

WALPOLE

STQUefllON

Ganapat^e ,/-¦
Farm Pond

SHARON1

FOTCBOROUGH

1Crack Rock Pond

/

Neponset River Watershed Water Quality
Grades and Compliance Rates - Calendar Year 2021

Grade Water Segment

Average
Compliance Rate



A+

Crackrock Pond

100.0



A+

Ganawatte Farm Pond

97.3



A+

Turner's Pond

96.7



A

Willett Pond

93.0



A-

Massapoag Brook

89.6



A-

East Branch

86.3



A-

Steep Hill Brook

86.2



B+

Mother Brook

83.4



B+

Mine Brook

83.4



B+

Beaver Brook

80.2

\[

B

Middle Neponset River

79.3

\

B

Spring Brook

77.9



B

Mill Brook

77.8



B

Upper Neponset River

75.8



B

Ponkapoag Brook

75.2



B

Pecunit Brook

75.1



B-

Beaver Meadow Brook

74.1



B-

Lower Neponset River

72.0





DOVER 1

N/v

BOSTON

DEDHAM

RANDOLPH

C+

Hawes Brook

67.8

C

Traphole Brook

61.2

C

Purgatory Brook

60.2

C-

Pequit Brook

59.1

C-

Pine Tree Brook

55.7

D+

Germany Brook

50.0

F

Unquity Brook

33.6

F

Meadow Brook

25.1

HERE, Garmin, © OpenStreetMap contributors, and the GIS user a

Average Compliance Rates for Swimming and Boating Standards

A



B



C



D



F

100-86

85-71

70-56

55-40

39-0

Monitoring Points

2021 Neponset 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

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