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Auckland, Monday, March 13, 2017
The first wastewater study of drug use in New Zealand confirms methamphetamine is the most commonly detected illegal drug in Auckland.
In a pilot study, funded by Massey University, Auckland wastewater treatment plants were sampled daily from May to July 2014.
These plants service a catchment area of approximately 1.3 million people.
Associate Professor Chris Wilkins from the SHORE and Whriki Research Centre co-authored An exploratory wastewater analysis study of drug use in Auckland, New Zealand, with environmental toxicologists from Queensland Universitys National Research Centre for Environmental Toxicology.
The paper has been published in the Drug and Alcohol Review today.
High use in Auckland
Professor Wilkins said that the results show consistent levels of methamphetamine, codeine, morphine and methadone in our largest city.
These drugs were found in high frequency, followed by amphetamine, MDMA [ecstasy] and methylone [a common ecstasy substitute]. Methamphetamine consumption was found at similar levels in both catchments however, interestingly, cocaine was only detected in one catchment and only on eight occasions during the testing period. Two of the detections identified cocaine but not its metabolite, suggesting the disposal of raw cocaine into the sewer rather than cocaine consumption, he said.
Professor Wilkins said that while the other drugs were detected at consistent levels throughout weekdays, MDMA and methylone were only detected on weekends, suggesting they are used primarily as party drugs.
Increasing dependency
The consistent use of amphetamine and methamphetamine suggests their use is not limited to late-night weekend partying. The stimulant properties have long been known to be used across a range of work, domestic and recreational activities that require long periods of stamina and concentration, Dr Wilkins said.
Its not surprising methamphetamine presented more regularly, as it is also associated with high levels of dependency, which may also dictate more regular use patterns. The low level of cocaine consumption is consistent with the very low use and availability of cocaine as reported in our annual monitoring surveys.
Research Partners
Wastewater analysis has been conducted in cities in Europe, North America, Asia and Australia, but this is the first time a study of this kind has been carried out in New Zealand.
The study was carried out by Dr Foo Yin Lai (University of Queensland), Associate Professor Chris Wilkins (Massey University), Dr Phong Thai (University of Queensland) and Professor Jochen F Mueller (University of Queensland).
Editors Note: Massey University has clarified that the study did not test for cannabis, because it tends to bind to solids, and so needs extra testing which is very expensive, and the researchers only had enough budget for a pilot study.
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Photo Caption:
Professor Chris Wilkins
