Barwon Water has appealed to residents to avoid pouring fats and oils down drains following a sewer spill at Waurn Ponds this morning.
The spill, at Chenin Mews, was caused by a build up of fat in the sewer main. A small amount of sewage had flowed into Waurn Ponds Creek by the time Barwon Water crews arrived shortly after the spill was reported.
Water quality samples have been taken from the creek and warning signs advising people to avoid contact with the water erected as a precaution.
Results of the tests are expected over the weekend and will determine when the signs can be removed.
Barwon Water General Manager of Water Systems Carl Bicknell said investigations found the sewer pipe was blocked by fat.
"We ask residents to be mindful of what they put down the sewer as it can impact on infrastructure and result in spills."
Customers can report a water or sewage related emergency (such as a leak or burst pipe) to Barwon Water 24 hours a day, 7 days a week on 1300 656 007.