Anyone from NSW, as well as Victoria which was declared high risk on Thursday, will be unable to enter Tasmania unless granted an exemption.

Previously, only the Greater Sydney region and three other areas in NSW were declared high risk.

About 500 people in Tasmania are in home quarantine having returned from high risk areas. Since last night, 400 compliance checks have been carried out by Tasmania Police and other authorities.

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Anyone who arrived in Tasmania from Victoria since July 8 has been asked to avoid social gatherings and wear masks in public.

NSW recorded 111 more cases on Saturday, with one third of those infectious while in the community.

It was revealed 1400 people have entered Tasmania from regional NSW but Premier Peter Gutwein said those travellers were considered low risk.

He said the decision to close the border to the entire state of NSW was due to evidence of the movement of infectious individuals around the state.

Mr Gutwein said testing numbers remain high, and all had been returned negative.

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"Just under 900 tests conducted yesterday, over 700 day before that, 700 day before that," he said.

"All tests remain negative, and importantly last night the wastewater testing we did was negative as well.

"Don't hesitate to get tested if you feel unwell."

Acting director of public health Scott McKeown said authorities had to weigh up the risks of travel from NSW.

"At this time, with this pandemic and this strain, we cannot at this stage take further risk on top of the risk that we are taking," he said.

Victoria recorded 19 new locally acquired cases of COVID-19 today while Western Australia announced one case of COVID-19 overnight.

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