With premiers and chief ministers grappling to respond, Prime Minister Scott Morrison will call an urgent National Cabinet meeting on Monday to address the situation.

Until then, ACT residents are required to comply with various restrictions and health measures.

Canberra residents have been banned from entering South Australia as the state closes its borders to the ACT, Queensland and Western Australia.

Responding to the "significant deterioration" in the COVID-19 situation across the country, premier Steven Marshall told reporters on Sunday the ban was effective immediately.

A ban was already in place for residents entering SA from NSW and areas of concern in Melbourne.

SA Chief Public Health Officer Nicola Spurrier said officials were particularly concerned that the cases of community transmission in other parts of the country involved the more transmissible Delta variant of the disease.

Canberrans travelling to Victoria are also subject to new restrictions from Sunday, after the state declared the ACT an orange zone.

Residents travelling from an orange zone are required to get a COVID-19 test upon arrival and isolate until they return a negative result.

All travellers from anywhere in Australia must apply for a permit to enter Victoria.

The changed directions comes as Victorian Premier Daniel Andrews returns to work this week, more than three months after fracturing his spine and breaking several ribs in a fall.

From 6pm on Sunday, ACT residents entering Western Australia are required to get tested and self-isolate for 14 days after arriving.

The ACT has been classified as a low-risk jurisdiction by WA meaning before travelling, residents must complete a mandatory registration and declaration.

If ACT residents are not deemed to have a suitable premises for self-quarantine, they will be directed to a government approved facility, at their own expense.

WA reintroduced its hard border with NSW, meaning no one who has been in the state since June 11 is permitted to enter.

SA and Tasmania are the only states that do not have quarantine restrictions.

ACT residents are not banned from entering the Northern Territory, however, all interstate arrivals must fill in a border entry form.

Strict border controls apply to all access points to the Northern Territory, as Darwin and its surrounding areas enter their second day of a snap lockdown.

While Canberra residents can still travel to Tasmania, anyone who has been to an exposure site is not permitted to enter.

Travellers from greater Sydney have been banned from entering the state since Saturday.

Travel restrictions are not in place for ACT residents.

Queensland Health has advised anyone who has been in the ACT, as well as Victoria or New Zealand in the last 14 days who develops COVID-19 symptoms should get tested.

Queensland has reinstated border restrictions to all of greater Sydney, including the Blue Mountains, Wollongong, Central Coast and Shellharbour.

New Zealand has ended its quarantine-free travel bubble with Australia until at least midnight on Tuesday.

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