City ‘smoke’ survey will test sewer line connections in Dot

Boston Water and Sewer Commission will be using water vapor— that has the appearance of smoke— to test sewer lines in parts of Dorchester over the next two weeks. The survey uses an odorless water vapor to detect improper connections as the vapor leaks out.

The testing began on Aug. 27 and is scheduled to run through Sept. 7 within a grid whose outmost boundaries are Centre Street on the north, Neponset Avenue to the east, Ashmont Street to the south, and Washington Street to the west. Not every street within the boundary area will be involved in testing, according to BWSC. The object of the test is to find any defects that might allow stormwater to enter the sewer system, contributing to backups and discharges into waterways during heavy rain storms.