The annual scientific analysis of wastewater treatment plants found the NT scored highest for cannabis, MDMA (ecstasy), nicotine and alcohol use.

While Darwin was tested, the Australian Criminal Intelligence Commission says a regional NT location was also examined for the report but has not revealed where it was.

The commission released its sixth National Wastewater Drug Monitoring Program report yesterday.

As well as the highest cannabis use, based on the wastewater findings for August 2018, the NT also reported the highest use of the party drug MDMA in capital city sites, and the highest nicotine and alcohol consumption in both capital city and regional sites.

Using data from the program, more than 9.6 tonnes of methylamphetamine is estimated to be consumed in Australia each year, as well as more than 4 tonnes of cocaine, 1.1 tonnes of MDMA, and more than 700 kilograms of heroin.

At street prices, the estimated value of this quantity of drugs for the four drugs is in the region $9.3 billion, underlining the size of the black economy that relates to drugs alone.

The commission's chief executive officer Michael Phelan APM said wastewater data increases understanding of drug consumption in Australia including drug use patterns across states, territories and the nation.

“Cannabis consumption has been included for the first time, showing regional average cannabis consumption exceeded capital city average consumption in August 2018. Its inclusion in the program provides further insight into one of the largest illicit drug markets in Australia,” Mr Phelan said.

“On a national level, of the drugs measured by the program with available dose data, alcohol and nicotine remain the highest-consumed substances.

“As the program continues to build long-term drug consumption data, fluctuations in consumption are evident. Understanding local drug consumption patterns assists law enforcement, policy, regulatory and health agencies develop targeted supply, demand and harm reduction strategies.”

In August 2018, the program monitored 13 licit and illicit substances at 58 wastewater sites nationally, covering 56 per cent of Australia’s population—around 13 million people.

There were two sites monitored in the Territory in August 2018—one capital city site and one regional site.

The full report says with only two participating sites the results for the NT "may not be representative of the Territory as a whole".

The National Wastewater Drug Monitoring Program found that, compared to April 2018, of the substances tested in August 2018 in the NT:

As the National Wastewater Drug Monitoring Program concludes its second year, long-term data is now available to provide greater insight into drug consumption in Australia.\

Annual methylamphetamine, cocaine, MDMA and heroin consumption estimates for the first two years of the program show the estimated weight of methylamphetamine and cocaine consumed annually has increased from the first year of the program, while the estimated weight of MDMA and heroin consumed annually has decreased.

The Australian Criminal Intelligence Commission received $3.6 million over three years from Proceeds of Crime funding for the National Wastewater Drug Monitoring Program. The University of Queensland and the University of South Australia have been commissioned to deliver the program and prepare the research findings.

While you're with us, you can now receive updates straight to your inbox each Friday at 6am from the Katherine Times. To make sure you're up to date with all the news, sign up here.