Wednesday's new cases smash the record set yesterday when 12,390 cases were recorded.
It means there are now 68,893 active cases and 275 people in hospital across the state, with Premier Mark McGowan saying while that number is expected to rise, it is “certainly well below what was modelled”.
One in 40 people in WA are currently isolating with Covid, with the Premier saying a third of those, about 24,000 people, are under the age of 19.
Of those hospitalised, McGowan said 27 per cent were unvaccinated, despite only making up one per cent of the WA population.
The WA Government introduced new legislation to parliament on Tuesday to ensure specific Covid restrictions and rules can remain in place.
Under the new rules, the seven-day isolation requirement for Covid cases and the use of face masks will be continued.