The repairs cost a total of approximately $A2.5 million and were completed at various locations in Surry Hills, Haymarket, Alexandria and Mascot.
Sydney Water Managing Director Kevin Young said the work has significantly improved the capacity and life expectancy of the pipes.
“During the work, crews removed 44 tonnes of silt and debris from inside the pipes, demolished and replaced three roof sections, and repaired the internal surfaces of all the maintenance holes,” said Mr Young.
“These pipes were built over a hundred years ago and are an essential part of our wastewater infrastructure.
“They also raised a buried maintenance hole 1.5 m to the road surface and reinforced some of the holes with stainless steel ring supports,” he said.
Sydney Water worked with contractor Water Infrastructure Group to complete the repairs on the pipes, which date back to the 1890s.
Mr Young said the investment is part of a broader $A177.3 million spend across Sydney Water’s water distribution systems and sewer networks for 2012-13.