NSW Health's COVID-19 contact tracing teams have expanded to trace and contact people at risk of COVID-19.

Some 89 cases of community transmission were recorded in the latest reporting period as the highly transmissible Delta variant spreads in Sydney.

NSW chief health officer Kerry Chant said the case interviews were distributed across the state. That includes the Mid North Coast.

Dr Chant said they were ensuring the information came back and the intelligence gathered from that information was led by the public health unit at South Western Sydney.

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The State contact tracing program is centrally managed through Sydney.

Mid North Coast Local Health District chief executive Stewart Dowrick said they had doubled the amount of people who were locally trained to be contact tracers.

"Every rural local health district is contributing towards the tracing exercise at the moment, just as those in Sydney would assist us if we had an outbreak up here of a material proportion," he said.

The MidNorth Coast remains COVID-free.

COVID-19 testing across the region has substantially increased during the Sydney outbreak.

"The testing we did in the first week of the outbreak was double what we had experienced in the Northern Beaches outbreak in January this year or the Victorian outbreak in August last year," Mr Dowrick said.

Testing numbers remain high at Port Macquarie, Kempsey, South West Rocks, Woolgoolga and Coffs Harbour.

The Port Macquarie COVID-19 testing clinic moved from Lake Road to a drive-through clinic at Port Macquarie Regional Stadium on June 28 as testing numbers increased due to the Sydney outbreak.

The drive-through clinic will remain open until at least the end of the week with the location reassessed depending on the situation in Sydney.

The COVID testing clinic will ultimately move back to Lake Road.

Drive-through testing clinics are operating at Manning Base and Forster hospitals.

Mr Dowrick thanked everyone who got tested and recognised the efforts of the police, local government and others that worked with the local health district to get the drive-through clinic set up.

Sewage surveillance testing is another tool in the fight against COVID-19.

Sewage testing is ongoing at Dunbogan, Bonny Hills, Port Macquarie, South West Rocks and Coffs Harbour.

"It is a great additional support to our COVID response and councils have been great in working with us to continue that program," Mr Dowrick said.

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