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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
Annual Report on Infiltration and Inflow (PDF)
Outfall Monitoring Overview (PDF)
Demand Management Report - Assurance of Compliance with 436 MGD Flow Limit (PDF)
Annual Status of Plant Maintenance (PDF)
CSO Facilities Summary Report (PDF)
PERIODIC & SEASONAL REPORTING
Beach Monitoring Data
Contingency Plan Exceedance: infaunal diversity (summer 2014) (PDF)
Notices of treated discharges at the Cottage Farm CSO outfall to the Charles River
Sanitary Sewer Overflows (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