Breaking bad habits: wastewater analysis shows drug use across Europe drinking water supply.

Jan. 1, 2017
Data published from wastewater monitoring campaigns has for the first time been used to show illicit drug use trends on a population level in a timely manner.

Data published from wastewater monitoring campaigns has for the first time been used to show illicit drug use trends on a population level in a timely manner.

Latest findings from the largest European project in the emerging science of wastewater analysis have been presented by the Europe-wide SCORE group, in association with the EU drugs agency (EMCDDA).

The project analysed wastewater in over 50 European cities in 18 European countries in March 2016 to explore the drug-taking behaviours of their inhabitants.

From London to Nicosia and from Oslo to Lisbon, the study analysed daily wastewater samples in the catchment areas of wastewater treatment plants (WWTPs) over a one-week period.

Wastewater from approximately 25 million people was analysed for traces of four illicit drugs: amphetamine, cocaine, MDMA (ecstasy) and methamphetamine.

Wastewater based epidemiology is a rapidly developing scientific discipline with the potential for monitoring near-real-time, population-level trends in illicit drug use.

By sampling a known source of wastewater, such as a sewage influent to a wastewater treatment plant, scientists can now estimate the quantity of drugs used in a community by measuring the levels of illicit drugs and their metabolites excreted in urine.

The results have been released through an interactive map and chart-based tool allowing the user to look at geographical and temporal patterns and zoom in on results per city.

As a result, regional variations in drug use patterns have been revealed:

  • Methamphetamine use, generally low and traditionally concentrated in the Czech Republic and Slovakia, now appears to be present also in the east of Germany and northern Europe, particularly in cities in Finland.
  • Traces of cocaine in wastewater indicate that cocaine use is highest in western and southern European cities, particularly in cities in Belgium, the Netherlands, Spain and the UK.
  • For MDMA, the 2016 wastewater data confirmed the trend established in 2015. In most cities, wastewater MDMA loads were higher in 2016 than in 2011, with sharp increases seen in some cities, which may be related to the increased purity of MDMA or increased availability and use of the drug.
  • Amphetamine detected in wastewater varied considerably across the study locations, with the highest levels reported in cities in the north of Europe.
  • When weekly patterns of drug use were examined, cocaine and MDMA (ecstasy) levels rose sharply at weekends in most cities, while methamphetamine use appeared to be more evenly distributed throughout the week.

In this project, SCORE used a standard protocol and a common quality-control exercise in all locations, making it possible to directly compare illicit drug loads in Europe over a one-week period over six consecutive years.

The EMCDDA said “wastewater analysis as a valuable additional tool in its epidemiological toolkit and one which can provide timely information on a wide spectrum of substances”.

Alexis Goosdeel, director of EMCDDA, said: “Wastewater-based epidemiology has demonstrated its potential to become a useful complement to established drug monitoring tools. Its ability to deliver timely data on drug use patterns is particularly relevant against the backdrop of an ever-shifting drugs problem.

“By detecting changes in drug use patterns, both geographically and over time, it can help health and treatment services respond better to emerging trends and changing treatment needs. We are delighted that the SCORE group has been able to release data for the first time in the same year as the data-collection exercise.”

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