Before 7 p.m., the MBTA reported delays due to staffing at the Ashmont T stop at Peabody Square in Dorchester. At 8 p.m., the transit agency said water from an external pipe had “entered the northbound track area at Ashmont.”

The MBTA switched to shuttle buses between Ashmont and JFK/UMass, which were still in service as of 11 p.m. Tuesday.

The Boston Water and Sewer Commission wrote on social media around 9 p.m. that its teams were on site in Dorchester and that “water supplies will be impacted.”

Shortly after 10 p.m., the Commission announced that repair work was underway and would be carried out “quickly.”

“Customers may experience discolored water, which is common after a pipe burst,” BWSC wrote. “Many services may be affected. The discoloration will disappear once crews flush the system after repairs are completed.”

Further information was not initially available on Tuesday evening.