Do levels of cannabis in wastewater in Australia vary by geographic location?

The amount of cannabis found in Australian wastewater varies substantially between Australian jurisdictions.

The Australian Criminal Intelligence Commission reported that specific sites in New South Wales, South Australia, Tasmania, and the Northern Territory had the highest cannabis use. Use was relatively low in capital city New South Wales and Victoria compared to other parts of the country. In general cannabis use was substantially higher in regional areas than in capital cities.

Source: Australian Criminal Intelligence Commission (2019). National Wastewater Drug Monitoring Program: Report 7. Canberra: ACIC.

†This FAQ uses data from the National Wastewater Drug Monitoring Program. Tetrahydrocannabinol (THC) is the main psychoactive compound in cannabis. Cannabis consumption was measured by its urinary metabolite, 11-Nor-9-carboxy-∆9-tetrahydrocannabinol (THC-COOH). Further information on the National Wastewater Drug Monitoring Program is available here.