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Boston Harbor & Massachusetts Bay
Massachusetts Water Resources Authority

ENVIRONMENTAL MONITORING

MWRA's discharge permit requires extensive water quality testing to ensure that we comply with the federal Clean Water Act.

Measurements include nutrients, pathogens, solids, and the health of fish and shellfish in the water and sediments of Boston Harbor, and Massachusetts and Cape Cod Bays.


Water Quality Monitoring

ENVIRONMENTAL QUALITY UPDATES
What's New: The latest water quality and permit-required reports
Annual Outfall Monitoring Overview (PDF)
Fish & shellfish in Boston Harbor & Massachusetts Bay
Pamphlet: Monitoring Bacteria in the Harbor and Bay (PDF)
TREATMENT PLANT EFFLUENT
NPDES discharge permit reports
Combined Sewer & Sanitary Sewer Overflow notifications
Deer Island Treatment Plant performance (PDF)
SCIENCE & DATA
Technical Reports
Harbor, river, and beach monitoring data
BOSTON HARBOR & RIVERS
Harbor water quality
Harbor current temperature
Harbor beaches
Tributary Rivers: Charles, Mystic, and Neponset
MASSACHUSETTS BAY
Massachusetts Bay water quality
Monitoring Bacteria in the Bay
HISTORICAL
Report Archive
Boston Harbor Project
Award-winning State of Boston Harbor report series