The spread of COVID-19 in NSW and high number of virus cases and deaths in aged care facilities have prompted the alert from NSW Health on Friday.

"This decision has been reached after careful consideration of the risks of COVID-19 being introduced into an aged care facility while the [Sydney] CBD cluster is brought under control," NSW Health's alert said.

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"While we understand and acknowledge this will be difficult for many families on Father's Day, our priority is to prevent the spread of the virus to the most vulnerable people in the community.

"We encourage people to make the best of the COVID safe measures the aged care sector has put in place to make contact with their loved ones, including through audio visual links and window visits."

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The advice for visitations to aged care facilities is in place for the Nepean Blue Mountains Local Health District, of which Lithgow is part of, as well as Sydney and Central Coast LHDs.

Currently there are 87 active COVID-19 cases in NSW, including seven in intensive care with four of those people being ventilated.

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NSW Health has advised that people must remain vigilant with COVID-19 continuing to circulate in the community.

There have been 54 deaths in NSW from COVID-19 cases.

Locations linked to known cases, advice on testing and isolation, and areas identified for increased testing can be found here.