Bad news: the helicopter accidentally used sewerage wastewater to put out the bushfire near a residential area north-east of Perth.

Good news: the multi-day heat wave of 40°C weather should kill all the bacteria.

https://www.perthnow.com.au/news/disaster-and-emergency/bullsbrook-hazmat-warning-issued-after-water-bombers-drop-sewerage-wastewater-to-put-out-bushfire-c-13512227

Bullsbrook HAZMAT warning issued after water bombers drop sewerage wastewater to put out bushfire

A HAZMAT warning has been issued for Bullsbrook residents after sewerage wastewater was used to put out a bushfire that threatened lives and homes yesterday.

PerthNow
@jamesh a firefighting friend called it "returdant"
@jamesh Ah, to be sure tis a blessing that getting fried kills the germs.