~ A public health warning has been issued by the local public health department regarding recent sewage discharge, also known as a combined sewer overflow (CSO). According to state regulations, it is mandatory for the department to inform the public when such discharges pose a risk to their health. This includes situations where the discharge lasts for more than two hours.

The occurrence of a combined sewer overflow happens when heavy rainfall overwhelms the combined sewerage system, causing a mixture of rainwater and wastewater to be discharged into nearby water bodies. This is done in order to prevent sewage backups in homes and businesses. However, the public is being 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 have ended. This is due to increased health risks from bacteria and other pollutants that are associated with urban stormwater runoff and untreated or partially treated wastewater.

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The Massachusetts Water Resource Authority Outfall MWR203 at the Prison Point facility on the Charles River in Charlestown experienced a treated discharge or overflow on Saturday, June 7 at 5:52 p.m., which lasted until 8:08 p.m. This has created a potential public health risk for those who may come into contact with the waters of the Charles River and Inner Harbor. The advisory will remain in effect until Monday, June 9 at 8:08 p.m., which marks 48 hours after the overflow has ended.

It should be noted that this information is subject to change and may be revised. For current updates, individuals are advised to check the Massachusetts Water Resources Authority website as well as the Boston Water and Sewer Commission website.

For more information about CSOs and their impact on public health, please visit www.boston.gov/cso.

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