More than 50,250 tests have been carried out so far, including 750 in the past 24 hours.

There is still one active case of coronavirus in the ACT and the total remains at 113. So far, 109 people have recovered and the death toll stands at three.

A surge in demand for testing has led the ACT government to open a new drive-through service in Kambah.

The site in the northern carpark of Jenke Circuit, Kambah, will be open from 9.30am to 5pm seven days and no appointment is required.

Health Minister Rachel Stephen-Smith has once again urged Canberrans to avoid travel outside of the ACT.

"Don't travel to regional areas of NSW or to Sydney unless you absolutely have to because we just don't know what the situation is at the moment in NSW," she said.

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"This is how we're going to get a wider spread of potential chain of transmission."

Her comments came as NSW Health revealed COVID-19 was detected in sewage at Perisher.

"Further sampling and analysis is required to assess the significance of this initial positive result," NSW Health said in a statement.

"The positive sewage result can be due to shedding of the virus by someone who may have previously had the illness, with the virus 'shedding' through their system for up to four weeks later."

No confirmed cases have been linked to either Perisher of Thredbo ski resorts, but authorities are urging anyone with symptoms to get tested.

NSW reported 18 new cases of coronavirus in the 24 hours to 8pm Wednesday. Six of those are under investigation and two are travellers in hotel quarantine.

Ms Stephen-Smith said the ACT would not be following Queensland's lead and declaring all of greater Sydney a hotspot.

"NSW seems to be continuing to manage the outbreak very well," she said

"Contact tracing and case investigation in NSW is incredibly strong."

Meanwhile, Victoria hit a grim record with 732 new cases and 13 deaths overnight.

Chief health officer Kerryn Coleman will on Friday provide advice to the government on whether any of the ACT's coronavirus restrictions can be eased.

"We would have been hoping that the situation in Victoria was getting better, rather than the same or worse, and that may play into her thinking," Ms Stephen-Smith said.