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Boston Harbor and Massachusetts Bay
Massachusetts Water Resources Authority


What's New

The Massachusetts Water Resources Authority has been granted a federal National Pollutant Discharge Elimination System (NPDES) permit to discharge effluent from the Deer Island Wastewater Treatment Plant into Massachusetts Bay. As required by its permit, MWRA must post many water quality reports online. To learn more about permit-required reporting, go to the NPDES permit page.


MONTHLY REPORTS
Discharge Monitoring Reports for Treatment Plant and CSO facilities (PDF)
Deer Island Treatment Plant performance (PDF)
Bacteria Monitoring in Massachusetts Bay
QUARTERLY REPORTS
Ambient monitoring quarterly: reports published in the last quarter (PDF)
Contingency Plan thresholds compared with ambient monitoring data (PDF)
Contingency Plan thresholds compared with effluent monitoring data (PDF)
ANNUAL REPORTS
Infiltration and Inflow
Outfall Monitoring Overview
Demand Management
Annual Status of Plant Maintenance
CSO Facilities Summary Report (PDF)
PERIODIC & SEASONAL REPORTING
Contingency Plan Exceedance: Phaeocystis (May 2015) (PDF)
Beach Monitoring Data and Fact Sheets
CSOs and SSOs
TECHNICAL REPORTS
Extensive list of reports on monitoring in Massachusetts and Cape Cod Bays.
HISTORICAL
Water quality report Archive

Questions? Email the Environmental Quality Department