WA State Government Mandate for Perth, Peel and South West regions.

Masks are mandatory for all indoor space and hospitals. This includes Apex Radiology sites, please ensure you wear a mask to your appointment. Exemptions can apply but proof must be sighted.

Information from WA Gov Website:
Masks must be worn in all indoor public settings, including in vulnerable settings like aged care facilities and hospitals. The usual exemptions apply.
The mask-wearing requirement will also apply to anyone who has been in the South West since Wednesday 12 January, when a previously reported positive COVID-19 case was infectious in the community, and has since travelled to another region.
This public health rule is in addition to the mask-wearing requirement currently in place for Perth and Peel, which requires people who have been in Perth or Peel since Thursday 6 January to wear a mask in other regions.
Source: https://www.wa.gov.au/government/announcements/masks-introduced-the-south-west-region