Barwon Water's design and construction arm, the Barwon Water Alliance, has been engaged to determine the best way to repair the damaged sewer main beneath the Anglesea River.
Several options are being investigated, including boring and installing a new pipe under the river or inserting a flexible sleeve inside the existing pipe.
Barwon Water's General Manager Water Systems Carl Bicknell said the most important considerations were protecting the environment and minimising disruption to the community during repairs.
"The project will involve major works and may take up to two months," Mr Bicknell said.
"Barwon Water is aiming to complete the difficult repairs by the end of October before the summer holiday season."
He said engineers would further assess options early next week.
"It is important to do the job correctly; the river crossing must have the highest possible integrity."
Meantime, water quality samples taken yesterday (Thursday, August 18) confirmed that the recycled water leak that occurred while testing the first repair attempt did not impact on the river.
Sewage from west Anglesea will continue to be trucked to the water reclamation plant and recycled water stored at Aireys Inlet. There is no disruption to customer service.
Mr Bicknell said regular updates would be issued to the media and be available on Barwon Water's website.