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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
Pamphlet (PDF): Overview of MWRA Monitoring
Annual Outfall Monitoring Overview (PDF)
Fish & shellfish in Boston Harbor & Massachusetts Bay

Pamphlet (PDF): Monitoring bacteria in Massachusetts Bay

TREATMENT PLANT EFFLUENT AND SEWAGE DISCHARGES
NPDES discharge permit reports
Deer Island Treatment Plant performance (PDF)
MWRA rapid notifications of sewage discharges
SCIENCE & DATA
Technical Reports List
Environmental monitoring data
BOSTON HARBOR & RIVERS
Harbor water quality
Harbor current temperature
Harbor beaches and beach fact sheets
Tributary Rivers: Charles, Mystic, and Neponset
MASSACHUSETTS BAY
Massachusetts Bay water quality
Massachusetts Bay effluent outfall
Monitoring Bacteria in the Bay
HISTORICAL
Report Archive
Boston Harbor Project
State of Boston Harbor report series