A city contractor will conduct smoke testing of the sanitary sewer system across the city for several weeks beginning Monday, according to a city press release.

Beginning Sept. 10, Hydrostructures, which is a contractor working on behalf of Suffolk’s Public Utilities department, will conduct smoke testing in Riverside Estates, Riverfront, Barrett Acres and Olde Town — the area bound by Finney Avenue, Holladay Street, East Washington Street and North Main Street.

Residents who will be affected by the smoke testing will be informed by door hangers prior to the testing. The hand-delivered hangers will describe the extent of the work.

The testing is done by injecting opaque-colored smoke through the sewer pipes to locate deficiencies. The deficiencies they are looking for can contribute to overflows within the sanitary sewer system.

The smoke is non-toxic, harmless and creates no hazard to the public, the press release states.

For more information, contact Jarrett Moran, Public Utilities engineering manager, at 514-7024.