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 following outflow locations experienced discharge events:

• Massachusetts Water Resources Authority Outflow MWR203, located in the Upper Inner Harbor, upstream of North Washington St. Bridge, experienced a treated discharge or overflow starting on January 26 at 3:05 a.m., creating a potential public health risk. This overflow ended at 6:29am. This data is preliminary and may be revised. Check the Massachusetts Water Resources Authority website here for current updates about this discharge. This event may potentially affect waters in Boston Inner Harbor.
• Boston Water and Sewer Commission Outfall 070, located on the Fort Point Channel at Albany Street, experienced a discharge or overflow on January 26 starting at 4:05am and lasting until 6:25am, creating a potential public health risk. This data is preliminary and may be revised.  Check the Boston Water and Sewer Commission website here for current updates about this discharge.  This event may potentially affect waters in Fort Point Channel and Boston Inner Harbor.
• Boston Water and Sewer Commission Outfall 013, located at the confluence of the Mystic River and Chelsea Creek at the Condor Street Bridge in East Boston, experienced a discharge or overflow on January 26 starting at 2:40am and lasting until 6:50am, creating a potential public health risk. This data is preliminary and may be revised.  Check the Boston Water and Sewer Commission website here for current updates about this discharge.  This event may potentially affect waters in Boston Inner Harbor and the Chelsea Creek/Mystic River confluence.
• Boston Water and Sewer Commission Outfall 003, located on the inner harbor near Porter Street in East Boston, experienced a discharge or overflow on January 26 starting at 2:00amam and lasting until 7:05am, creating a potential public health risk. This data is preliminary and may be revised.  Check the Boston Water and Sewer Commission website here for current updates about this discharge.  This event may potentially affect waters in Fort Point Channel and Boston Inner Harbor.
• Boston Water and Sewer Commission Outfall 009, located on the upper inner harbor near Summer Street/Lopresti Park in East Boston, experienced a discharge or overflow on January 26 starting at 2:10am and lasting until 4:25am, creating a potential public health risk. This data is preliminary and may be revised.  Check the Boston Water and Sewer Commission website here for current updates about this discharge.  This event may potentially affect waters in Fort Point Channel and Boston Inner Harbor.

This advisory will expire 48 hours after the overflow has ended at each location. There may be additional discharges or overflows associated with this weather event. Please check the BWSC and MWRA websites for complete information.

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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.

A combined sewer overflow occurs when a large storm overwhelms the combined sewerage system causing rainwater to mix with wastewater and discharge to a nearby water body. This prevents sewage backups into homes and businesses.

More information about CSOs and public health is available at boston.gov/cso

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