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Boston Harbor & Massachusetts Bay
Massachusetts Water Resources Authority

ENVIRONMENTAL QUALITY MONITORING

MWRA's NPDES discharge permit requires reports on several measures of environmental quality and system maintenance. This is intended to control water pollution and ensure compliance with the federal Clean Water Act.

MWRA monitors the water quality of Boston Harbor, Massachusetts Bay, and Cape Cod Bay, measuring nutrients, pathogens, metals, organics, solids, pH, oil and grease, and toxicity. Learn more about MWRA's environmental monitoring.


Monitoring in Massachusetts Bay

WATER QUALITY REPORTS
What's New: The latest water quality and permit-required reports
Technical Reports List
Pamphlet: Monitoring Bacteria in the Harbor and Bay (PDF)
Harbor and Bay annual monitoring overview (PDF)
MONITORING & COMPLIANCE DATA
NPDES discharge permit reports
Combined Sewer & Sanitary Sewer Overflow reporting
Deer Island Treatment Plant performance (PDF)
Harbor, river, and beach monitoring data
BOSTON HARBOR & BEACHES
Press Release: How Clean Is Boston Harbor?
Boston Harbor water quality
Boston Harbor current temperature
Boston Harbor beaches
MASSACHUSETTS BAY
Massachusetts Bay water quality
Monitoring Bacteria in the Bay
RIVERS
Boston Harbor's Tributary Rivers: Charles, Mystic, and Neponset
Harbor, river, and beach monitoring data
HISTORICAL
Report Archive
Boston Harbor Project
State of Boston Harbor report series