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Boston Harbor and Massachusetts Bay
Massachusetts Water Resources Authority

Water Quality Data

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. Data Analysis & Interpretation of MWRA water quality data in Boston Harbor and Massachusetts Bay are available for download on our Technical Reports List.

Download Monitoring Data from the tables below.

Sampling Data Boston
Harbor
Neponset
River
Charles
River
Mystic
River
Stations Harbor Map Neponset Map Charles Map Mystic Map
Physical All data All data All data All data
Clarity All data All data All data All data
Nutrients All data All data All data All data
Bacteria All data All data All data All data

Boston Harbor's Tributary Rivers

Download Data from Boston Harbor Beaches

How MWRA manages water quality data