Six West Australians who stayed at Brisbane's infected Hotel Grand Chancellor are self-isolating in Perth but have tested negative to COVID-19.
The quarantine hotel has been shut down after being linked to a cluster of cases of the highly contagious UK coronavirus strain.
Health Minister Roger Cook said the group would receive further tests and their close contacts were being monitored on a daily basis but are not required to isolate.
"It was one floor in that particular hotel (that had the positive cases)," he told reporters on Thursday.
"Although we can't identify how it moved from one room to another on that same floor, it is at this point in time a very low risk."
He said WA Health had audited its quarantine hotels and advised there were no concerns about potential transmission via the airconditioning.
Amid growing concerns about the UK strain, anyone who tests positive in WA will now be required to remain in quarantine for another 14 days after their diagnosis.
Hotel quarantine guests previously had a further 10 days added to their stay if they became infected.
Premier Mark McGowan said he had spoken to Queensland counterpart Annastacia Palaszczuk on Thursday, describing the Brisbane hotel outbreak as "inexplicable".
Mr McGowan said WA did not intend to follow Queensland in ordering people to quarantine in vacant regional mining camps rather than hotels
He cited the logistical difficulties associated with providing medical staff, cleaners and police.
The premier instead renewed calls for national cabinet to look into using Commonwealth facilities such as Christmas Island for quarantining returned travellers.
"Clearly with the British strain, that's something we should reconsider," he said.
"I put that to the Commonwealth some months ago and they rejected that.
"I'm more than happy to have another discussion with the federal government about the use of remote Commonwealth facilities because those facilities are available and there are experienced staff that can deal with these matters."
WA recorded two new cases overnight, both returned travellers in hotel quarantine. Authorities are monitoring 17 active cases.
The state is yet to decide when it will bring down its hard borders to Queensland, NSW and Victoria, all of which recorded no new locally acquired cases on Thursday following recent outbreaks.
Australian Associated Press