Repairs to the Northern Suburbs Ocean Outfall System (NSOOS)

The NSOOS is northern Sydney's largest wastewater system and runs from Blacktown to North Head Wastewater Treatment Plant in Manly.

This work is part of Sydney Water's $560 million SewerFix Program to protect public health and the environment and includes the Avoid Fail program, which aims to improve the overall performance of the wastewater system by ensuring large wastewater systems do not fail in their operation and cause overflows.

Work to repair sections of the NSOOS is completed at:

• Greenwich
• Lane Cove
• Cremorne
• Manly

The work involved crews entering the NSOOS via maintenance holes to clean decayed concrete from the pipe's roof and walls, replace corroded joints and repair the internal structure of the maintenance hole. A coating was then applied to protect the roof and walls of the pipe. This will ensure the structural reliability of the NSOOS for many years to come.