Three new cases of COVID-19 were diagnosed in the 24 hours to 8pm on Friday bringing the total number of cases in NSW to 4,009.
There were 15,239 tests reported in the 24-hour reporting period, compared with 16,843 in the previous 24 hours.
Two were returned overseas travellers in hotel quarantine and just one was locally acquired, with the source under investigation.
The locally acquired case worked at Concord Hospital while potentially infectious.
The case cared for patients with COVID-19 and further investigation is underway to identify how the infection was acquired.
The heath department has warned that, despite case numbers being low, the virus is likely still circulating among people with mild symptoms and that the risk of outbreaks remains.
NSW Health said this was even more important with the upcoming school holidays, when people will travel across the state.