It is the first time New South Wales has reached the 28-day milestone since the start of the pandemic last March.
A previous 26-day streak last November ended on December 2 when a hotel quarantine worker tested positive.
The result comes after 16,302 people were tested across NSW yesterday.
Two new cases were detected in the state’s hotel quarantine program.
The 28-day milestone is significant as it marks two infection cycles of the virus – the length of time medical experts consider is needed before the virus can be said to be eliminated from the community.
NSW Health’s Dr Stephen Conaty described the results as “pleasing” but warned “this does not mean we can drop our guard”.
“Cases are present in other states and are regularly being detected among international travellers arriving from overseas,” he said.
The state now faces a fresh threat to remaining COVID-free, with its border to Victoria remaining open.
The person worked at Brunetti Cafe on February 9 between 4.45am and 2pm, Victoria Health says.
This content first appear on 9news