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Boston Harbor & Massachusetts Bay
Massachusetts Water Resources Authority

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

Monitoring in Massachusetts Bay


WATER QUALITY REPORTS & DATA
What's New: The latest water quality and permit-required reports
Technical Reports List
Water quality data
ENVIRONMENTAL MONITORING & COMPLIANCE
NPDES permit reports
CSO & SSO reporting
BOSTON HARBOR
Boston Harbor & Tributary River sampling
Harbor & river monitoring data
Boston Harbor beaches
Beach fact sheets and monitoring data
MASSACHUSETTS BAY
Massachusetts Bay page
Bacteria measurements in the Bay
Outfall monitoring overview
HISTORICAL
Report Archive
Historical Harbor & Bay monitoring, figures & graphs
Boston Harbor Project timeline
State of Boston Harbor report series