At the Water Corporation’s Beenyup Wastewater Treatment Plant in Craigie, treated wastewater is further treated to drinking water standards, through the Advanced Water Recycling Plant (AWRP), before being used for groundwater replenishment. The Water Corporation tested treated wastewater entering the AWRP for PFOS and PFOA over a six‑month period. PFOS was detected once at the limit of reporting (0.01 micrograms per litre) and PFOA was consistently detected at 0.02 to 0.03 micrograms per litre. After further treatment through the reverse osmosis component of the AWRP, PFOS and PFOA were not detected, confirming the effectiveness of the reverse osmosis treatment in removing these chemicals.

https://www.der.wa.gov.au/images/documents/our-work/community-updates/PFAS/WA_Government_Statement_PFAS.pdf