BOSTON, May 21, 2023 ~ The Boston Water and Sewer Commission (BWSC) and the Massachusetts Water Resources Authority (MWRA) have issued a public health warning related to a recent combined sewer overflow (CSO).

On May 20th, BWSC Outflow BOS003 located in the Inner Harbor at Porter Street in East Boston experienced an untreated overflow starting at 11:40pm, lasting until 1:55am on May 21st. Additionally, BWSC Outflow BOS070 located in the Fort Point Channel at Albany Street experienced an untreated overflow starting at 12:20am on May 21st and ending at 3:25am.

MWRA Outflow MWR203 located in the Upper Inner Harbor upstream of North Washington St. Bridge experienced a treated discharge or overflow starting on May 21st at 12:20am and ending at 3:25am. This advisory will expire 48 hours after the overflow has ended. This event may potentially affect waters in Boston Inner Harbor.

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State regulations require local public health departments to provide notice to the public when these discharges may create a risk to public health, including when a discharge lasts for more than two hours. The public is advised to avoid contact with affected water bodies for at least 48 hours after a sewage discharge or overflow, during rainstorms, and for 48 hours after rainstorms end due to increased health risks from bacteria or other pollutants associated with urban stormwater runoff and discharges of untreated or partially treated wastewater.

This data is preliminary and may be revised with additional overflows or revised time periods. Updates about this discharge can be found on the BWSC website here and the MWRA website here. More information about CSOs and public health is available at www.boston.gov/cso.

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