The WA government is urging parents to book their teenagers in for a COVID-19 vaccine this week as the state allows Pfizer jabs for residents aged 12 to 15.

All Western Australians aged 12 years and over will be eligible for a COVID-19 vaccine from Monday as the state passes 1.9 million vaccinations.

Health Minister Roger Cook said parents and guardians could go to the Roll Up for WA website to make a booking at a state-run vaccination clinic or make an appointment with a GP from 8:30am on Monday.

"I'm sure many parents of children in this age group are very keen to get their kids vaccinated against COVID-19 as soon as they can," Mr Cook said.

The latest Australian Bureau of Statistics figures show there are almost 133,000 Western Australians aged 12 to 15.

Children in WA aged 12 to 15 years old with specific medical conditions, who are Aboriginal and Torres Strait Islander or who live in remote communities, are already eligible for the Pfizer vaccine.

Premier Mark McGowan encouraged everyone to get vaccinated as it was "our best chance out of this pandemic".

"More than 57 per cent of Western Australians have received at least one dose of a COVID-19 vaccine but that rate needs to be rising," Mr McGowan said.

WA Health reported one new COVID-19 case in hotel quarantine on Sunday.

The new infection, in a returned traveller from the UK, brings to three the state's number of active cases in hotel quarantine.