The Australian Criminal Intelligence Commission has released new figures showing that Australians are spending more than 11.3 billion dollars on illicit drugs per year, including methylamphetamine, cocaine, MDMA and heroin.

A new Wastewater monitoring report accounts for 1.5 tonnes of methylamphetamine, 4.6 tonnes of cocaine, 2.2 tonnes of MDMA and more than 900 kilograms of heroin.

Shane Neilson, the commission’s Head of Determination says that there were some reductions from the previous report but overall consumption remains troubling.