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Boston health officials warn against contact with Fort Point Channel and Inner Harbor after sewage overflows

Two storm-driven overflows lasted more than two hours, triggering a public health advisory that runs until early Oct. 14, the Boston Public Health Commission said.

The Boston Public Health Commission on Monday warned people to avoid contact with the Fort Point Channel and the Inner Harbor after two sewage overflows during a storm each lasted more than two hours.

A Boston Water and Sewer Commission outfall in the Fort Point Channel discharged from 10:50 p.m. Oct. 11 until 1:05 a.m. Monday, the health commission said. The overflow affects the channel, downtown and the South Boston waterfront. The advisory for those waters expires at 1:05 a.m. Oct. 14, 48 hours after the discharge ended.

A Massachusetts Water Resources Authority outfall at its Prison Point facility released a treated discharge from 9:26 p.m. Oct. 11 until 1:56 a.m. Monday, affecting the Inner Harbor, the commission said. That advisory expires at 1:56 a.m. Oct. 14.

Combined sewer overflows happen when a large storm overwhelms a system that carries both rainwater and wastewater, sending the mix into a nearby body of water rather than letting sewage back up into homes and businesses.

The commission said people should stay out of affected waters for at least 48 hours after an overflow, during rainstorms and for 48 hours after rain ends, citing health risks from bacteria and other pollutants in urban runoff and untreated or partially treated wastewater.

State regulations require local health departments to notify the public when a discharge may pose a health risk, including when one lasts more than two hours. Other, shorter overflows may also have occurred, the commission said. The Boston Water and Sewer Commission and the MWRA post overflow notifications on their websites.

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Massachusetts