Victoria recorded zero new cases of COVID-19 for the fourth day in a row on Tuesday, after more than 13,500 tests were received.
This comes after viral fragments were detected in wastewater at Werribee, Tarneit and Hoppers Crossing.
Anyone who has been to these locations since February 23 and has any symptoms should get tested.
“People who have or have recently had COVID-19 may shed fragments of the virus,” a Department of Health spokesperson said.
“These fragments can enter wastewater through toilet bowls, sinks and drains.
“This may last beyond a person's infectious period.”
There are now just 10 active cases of COVID-19 in Victoria.