Chief Health Officer Kerry Chant said testing needed to increase as officials "mop up" any chains of transmission from the Northern Beaches cluster that emerged one month ago.

"We don't know the exact link to the source [of transmission for the original case] ... we are waiting for genome sequencing which will be available later today," she said.

NSW Premier Gladys Berejiklian was asked about hints from the Victorian Premier Daniel Andrews that the restrictions on people coming from NSW could be relaxed.

"He's not been in touch with me at all," she said.

"But I would also say that should have occurred quite a while back. I think everybody would agree closing a border of such significance is a really big deal."

Ms Berejiklian said Victorians stuck in NSW should be able to return.

"I've always said I can't understand why the border was closed in the first place and why the attitude of certain governments is what it is, especially given the federal authorities have not deemed any particular place in Australia a hotspot," she said.

"I think the Federal Minister today confirmed that there isn't anywhere in Australia that's currently being designated a hotspot.

"So why shouldn't people be able to return home and why shouldn't Australians be able to move around freely?"

In Victoria yesterday, there were 0 new locally acquired cases reported and 7 new cases in hotel quarantine.

The Victorian DHHS wastewater monitoring found an unexpected detection of viral fragments in wastewater from the Mount Beauty, Tawonga and Tawonga South areas.

The detection was on January 11 and "viral fragments detected in initial testing were not confirmed with further analysis".

DHHS said increased sampling was being undertaken at this site.

The result is inconclusive and not an indication of COVID-19 cases; even strong positive detections have not resulted in the detection of cases in places like Anglesea and Benalla previously.

IN OTHER NEWS:

DHHS has been contacted for further information.

Victorian Minister for Energy, Environment and Climate Change Lily D'Ambrosio addressed the media on Sunday morning and said there were 30 active cases in Victoria.

"In terms of the number of new cases in hotel quarantine, those figures include three that were related to Australian Open, one member of the air crew ... and two non-player participants of the Australian Open," she said.

"This is the 11th consecutive day where Victoria has recorded zero new cases of locally acquired transmission of COVID.

"Since the release of our new traffic light system ... we've seen 161,047 applications from people in either the red, orange or green zones, and in the last 24 hours we've had 20,571 applications."

As of 6pm on Saturday night, the Greater Brisbane LGAs of Brisbane, Moreton Bay, Redland, Logan, and Ipswich were declared an orange zone by Victoria's Chief Health Officer, after being "red".

The move, Mr Andrews said, was due to 14 days passing since a hotel cleaner tested positive in Brisbane, with 90 per cent of close contacts of that cleaner testing negative.

"We do hope, that in the next couple of days, we will be able to dramatically shrink the red zone [in NSW]."

"People, similarly, would be able to apply for an automatic orange zone permit."

Travel from an orange zone requires people to self-isolate, get tested within 72 hours of arrival and isolate until a negative result.

Victorians in any Sydney red zones still need to make an exemption application.