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Boston health officials warn of sewage overflows into Inner Harbor and Fort Point Channel

Four combined sewer overflows on Sept. 27 lasted more than two hours, prompting the Boston Public Health Commission to advise people to stay out of affected waters for 48 hours.

The Boston Public Health Commission issued a public health warning Monday after four sewage discharges into the Inner Harbor and Fort Point Channel on Sept. 27, advising people to avoid contact with the affected water for 48 hours after each overflow ended.

The discharges were combined sewer overflows, which happen when a heavy storm overwhelms a sewer system that carries both rainwater and wastewater, sending the mix into nearby water instead of backing up into homes and businesses. State regulations require local health departments to notify the public when such a discharge may pose a health risk, including when it lasts more than two hours, the commission said.

According to the commission, a Massachusetts Water Resources Authority outfall at the Prison Point facility discharged from 8:31 a.m. to 3:42 p.m., affecting the Inner Harbor. A second authority outfall, at the Union Park storage and treatment facility, discharged from 9:03 a.m. to 3:34 p.m. Both authority discharges were described as treated discharges or overflows.

Two Boston Water and Sewer Commission outfalls in the Fort Point Channel also overflowed, one from 9:05 a.m. to 3:30 p.m. and the other from 11:50 a.m. to 2:10 p.m. The Union Park and Fort Point Channel discharges affect the Fort Point Channel, downtown and the South Boston waterfront, the commission said.

Health officials advise avoiding contact with affected water during rainstorms and for 48 hours after storms end, citing bacteria and other pollutants from stormwater runoff and untreated or partially treated wastewater. The commission said other overflows that did not meet the two-hour reporting threshold may also have occurred.

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Massachusetts