The tally includes a person in a southwest regional area who was infectious while in the community.
Thirteen travel-related cases were also recorded, taking the number of active cases to 509 with no one currently in hospital.
But WA Health noted on Monday that testing numbers remained low with just 4351 people receiving PCR tests in the reporting period.
Premier Mark McGowan acknowledged over the weekend that state-run PCR clinics were well below capacity.
"The chances are that there are cases out there we don't know about - probably in large numbers - but we are encouraging people to get tested," Mr McGowan told reporters.
Australian Medical Association WA president Mark Duncan-Smith has speculated the number of cases in the WA community could be up to five times higher than the reported figures.
The premier said PCR testing remained WA's preferred method for now despite the state continuing to add to its stockpile of rapid antigen tests.
WA's third-dose vaccination rate, a key factor in the government's decision to delay reopening the borders, has now reached 51.3 per cent.
An outbreak linked to Juniper's Cygnet residential care home in the Perth suburb of Bentley has grown to 17 cases, including eight residents and four staff.
The facility, which accommodates people living with dementia, has been indefinitely closed to visitors.
Juniper chief executive Chris Hall said residents were being closely monitored and all staff and volunteers were undertaking rapid antigen tests prior to every shift.
"I would also like to confirm that no Cygnet staff members have worked at any other Juniper site since the infection was first detected last week," Mr Hall said.
Brightwater Care Group on Sunday said two fully vaccinated residents at The Cove in Mandurah had tested positive.
All staff and residents are being tested and the facility has been closed to visitors.
A second Mandurah facility, the Coolibah Care retirement village, is also testing residents and staff after an agency worker returned a positive rapid antigen test.
The government is close to introducing new public health social measures which are likely to include density limits at venues.
Currently, WA has an indoor mask mandate and a requirement to provide proof of vaccination to enter virtually all public venues.
"We haven't actually made a decision on when (further restrictions) will come in, but at some point in time they will come in," Mr McGowan said.
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