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Boston Harbor and Massachusetts Bay
Massachusetts Water Resources Authority

Archive

Environmental Monitoring Data
from Boston Harbor & Tributary Rivers

The Massachusetts Water Resources Authority's (MWRA) has been monitoring water quality in Boston Harbor and its tributary rivers since 1989. Collecting long-term water quality data helps to identify changes in water quality over time. MWRA monitors water quality at more than 70 locations in Boston Harbor and its tributary rivers. Boston Harbor is an estuary--a marine ecosytem where fresh water from the rivers enters the ocean. The largest rivers draining into Boston Harbor are the Charles, Neponset, and Mystic. Since 1989, MWRA has regularly monitored water quality in these rivers, measuring bacteria, algae, water clarity, dissolved oxygen, nutrients, and suspended solids.

Boston Harbor and River Monitoring Data

Boston
Harbor
Neponset
River
Charles
River
Mystic
River
Harbor Map Neponset Map Charles Map Mystic Map
Data Range Data Range Data Range Data Range
Harbor
Physical data
Neponset
Physical data
Charles
Physical data
Mystic
Physical data
Harbor
Clarity
Neponset
Clarity
Charles
Clarity
Mystic
Clarity
Harbor
Nutrients
Neponset
Nutrients
Charles
Nutrients
Mystic
Nutrients
Harbor
Bacteria
Harbor
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.

2018 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

Historical Beach Data

See also: Massachusetts Bay bacteria monitoring

How we manage water quality data