MWRA monitors the water quality of Boston Harbor and Massachusetts Bay, measuring nutrients,
pathogens, metals, organics, solids, pH, oil and grease and toxicity. See the WHAT'S NEW page for the latest water quality information and permit-required reporting.
Goals: Fulfill requirements of the NPDES discharge permit to assess the impacts of MWRA sewer system and treatment
plant discharges on Massachusetts and Cape Cod bays.
Harbor beaches are tested daily in summer, and warnings are posted when high bacteria counts are found.
Beach data are available for download.
Goals: Provide safe and pleasant recreational swimming. Assess sources of bacterial pollution at Carson, Constitution, Malibu, Pleasure Bay, Short, Tenean, Winthrop, and Wollaston beaches.