Virus fragments have been found in wastewater at three more Victorian locations, including the popular holiday destinations of Cowes and Castlemaine.
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The fragments were found at Castlemaine, Cowes and Pakenham on January 27.
The department of health is urging residents and anyone who has visited these areas from January 25 to 27 to get tested if they have symptoms of the virus.
It says the virus detections at each of the locations were weak, and could be due to people who have recovered from COVID-19 continuing to shed the virus.
There are now six locations across the state where virus remnants have been detected in recent days.
Fragments were also detected in wastewater in Gisborne, Hamilton and Leongatha.
The department says people who were in Gisborne from January 24 to 26, in Hamilton from January 25 to 27 or in Leongatha from January 17 to 19 should also get tested if they have symptoms.
On Saturday Victoria notched up 24 days since the last locally acquired case of the coronavirus.
But one new case has been detected in Melbourne's hotel quarantine system in the past 24 hours, making 23 cases in hotel quarantine.
The new case is an international airline crew member aged in her twenties.
There are currently almost two thousand people in hotel quarantine in Melbourne.
Also on Saturday, the WA government announced Victorians can travel to Western Australia quarantine-free from next week.
Victorians will not have to self-isolate on arriving in WA from 12.01am on Friday February 5, with the state designated "very low risk" from that time.
Travellers must be prepared to take a COVID test and undergo health screening, as well as complete a declaration about where they have come from.
But West Australian Premier Mark McGowan said the changes could be reversed if there are any further outbreaks.
"We won't hesitate to reinstate more stringent measures if we need to," he said.
Victoria will reach the milestone of 28 days with no local cases on Tuesday, but Mr McGowan defended waiting until Friday to relax restrictions.
"Sometimes just adding that little bit of precaution is very wise," he said.
Meanwhile Victoria's chief health officer will allow up to 30,000 people to attend the Australian Open in Melbourne, about half the usual attendance numbers.
Players and participants are continuing to leave the hotel quarantine system ahead of the tournament, which starts on February 8.
Australian Associated Press
