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Boston Harbor and Massachusetts Bay
Massachusetts Water Resources Authority

Archive

Environmental Monitoring Data
from Boston Harbor & Tributary Rivers

Boston Harbor is an estuary--a marine ecosytem where fresh water from the rivers enters the ocean. Since 1989, the Massachusetts Water Resources Authority (MWRA) has measured bacteria, algae, water clarity, dissolved oxygen, nutrients, and suspended solids at more than 70 locations in the Harbor and the CharlesNeponset, and Mystic rivers.

Boston Harbor and River Monitoring Data

Boston
Harbor
Neponset
River
Charles
River
Mystic
River
Harbor Map Neponset Map Charles Map Mystic Map
Harbor Data Ranges Neponset Data Ranges Charles Data Ranges Mystic Data Ranges
Download
Harbor
Physical data
Download
Neponset
Physical data
Download
Charles
Physical data
Download
Mystic
Physical data
Harbor
Clarity
Neponset
Clarity
Charles
Clarity
Mystic
Clarity
Harbor
Nutrients
Neponset
Nutrients
Charles
Nutrients
Mystic
Nutrients
Harbor
Bacteria
Neponset
Bacteria
Charles
Bacteria
Mystic
Bacteria

Detailed sampling location map

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Boston Harbor Beach Data

Water quality at Wollaston, Carson, Constitution, Tenean and Pleasure Bay beaches is tested by the Department of Conservation and Recreation (DCR) with assistance from the Massachusetts Water Resources Authority. For more information and other beach water quality links, visit MWRA's Boston Harbor Beaches page.

2019 Data

Beach Fact Sheets (PDF)
Download
Beach Data
Monitoring Locations
Constitution Map
Pleasure Bay Map
City Point
M Street Map
Carson Map
Malibu Map
Tenean Map
Wollaston Map

See also:

Historical Beach Data

Massachusetts Bay bacteria monitoring

How we manage water quality data