NSW has recorded another three new cases of locally acquired coronavirus, Premier Gladys Berejiklian has announced.

Of the new cases, two were close contacts of Berala cluster and the other was a close contact of someone from the northern beaches.

Almost 24,000 people were tested in the 24 hours to 8pm on Saturday night.

Ms Berejiklian said health authorities were still "mopping up" the fallout from the two major clusters that emerged in Sydney's southwest and northern beaches.

She said authorities and the community had faced a "mammoth task" of turning around what could have been a major outbreak of "disastrous proportions", but the fight was not yet over.

It comes after just the one new locally acquired case was announced on Saturday in a person identified as a close contact to the Berala cluster in Sydney's southwest.

The Berala cluster now stands at 23.

Avalon's cluster, which kickstarted a lockdown on the northern beaches, has grown to 150 cases.

Ms Berejiklian thanked northern beaches residents, who were emerging on Sunday from stay-at-home orders, saying she "deeply" appreciated their sacrifice.

People living in the northern zone of the peninsula had been ordered not to leave their houses for three weeks, since December 19.

"Today is your first day where you don't have the stay-at-home orders applying to you," the Premier said.

"But the case of community transmission overnight demonstrates that whilst the main threat of those clusters, both the Avalon cluster and then the related Berala cluster, the main threat has to some extent subsided, we're still mopping up and that's why all of us have to be on high alert.

"The risk in Greater Sydney is the same as last week.

"It only takes one or two cases to get out of control or undetected line of transmission to get out of control for all of us to be in a situation where we have to consider making things tighter, but pleasingly we are where we're at in New South Wales at the moment.

"I want to thank the northern beaches community for what they have gone through, for being so compliant, and for making sacrifices which have ensured that the lines of transmission did not spread in a manner which was out of control for the rest of Greater Sydney and, in fact, the state."

The new northern beaches case was located on the southern side of the region, NSW chief health officer Dr Kerry Chant told reporters.

She said the state needed to maintain high numbers of testing to ensure any spread of the virus did not go undetected.

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