Specialist divers will be called in to repair a damaged sewer pipe beneath the Anglesea River.
A leak in the main, which was carrying about 85 per cent Class C recycled water from Aireys Inlet and 15 per cent sewage from west Anglesea, was discovered last week.
The pipe crosses the river between River Reserve Road and Wray Street, Anglesea, and connects with the town's water reclamation plant.
The pipe was taken off line immediately the leak was located, warning signs erected along the river and relevant agencies, including the Environment Protection Authority and Corangamite CMA, notified.
The signs were removed when monitoring showed water quality was within safe levels.
Barwon Water's General Manager Water Systems Carl Bicknell said until repairs were completed, the recycled water would be stored in purpose-built lagoons at Aireys Inlet while sewage from west Anglesea would be trucked to the reclamation plant.
About seven truckloads a day would be collected.
Mr Bicknell said a diver who inspected the pipe yesterday identified a 12 cm-long damaged section.
"A specialist dive team will be undertaking the repairs later this week. The initial assessment suggests it will be a straightforward repair and should take no more than a day," he said.
There will be no interruption to services.