The ninth report of that National Wastewater Drug Monitoring Program provides longer-term insights into drug consumption as the program concludes its third year, and provides a comprehensive, national picture of drug consumption in Australia.

The report covers around 57 per cent of the population, which equates to about 13.3 million people. Fifty-eight wastewater treatment plants across Australia participated in the August 2019 collection, which monitored the consumption of 13 substances.

To maintain treatment plant confidentiality, each site was allocated a unique code and site names are not included.