MidCoast Council's annual sewer investigation program is set to resume, beginning in Hallidays Point on Monday 30 January.
It will then expand to Forster on Monday 6 February.
The program involves Council's contractors using closed circuit television cameras to scan the sewer network and identify defects. The sewer system is also cleaned during the process.
Council's Director of Infrastructure and Engineering Services, Rob Scott, said the work was completed from manholes and would largely go unnoticed by residents.
"Sewer investigations help us manage risks in the sewer system and prioritise our maintenance work," said Mr Scott.
"However, there's no access to houses or interruptions to services required.
"We just ask people to keep their toilet lids down and their toilet doors closed as much as possible to stop backflows of air coming up through the toilet while the sewer is being cleaned."
Residents can continue to use their toilets while the program is underway.
The work will take place between 7am and 5pm weekdays, and 7am to 1pm Saturdays.
The program is expected to be completed in both Hallidays Point and Forster by late March.
