Wastewater analysis and drugs — a European multi-city study

The European Monitoring Centre for Drugs and Drug Addiction (EMCDDA)

A wastewater analysis has indicated that in Europe, cocaine from South America is now being consumed in smaller towns, as well as major urban areas.

The report, published on March 20 by the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA), is the institution’s latest annual overview of drug residues used to estimate cocaine consumption across participant cities in Europe. This year, the report analyzed results from approximately 90 cities and towns, though several major cities, including London, Madrid, and Berlin, did not participate.

It found that the Belgian city of Antwerp, a vital port for the arrival of drugs from Latin America to Europe, remains the continent’s cocaine consumption capital, while eastern European states — particularly the Czech Republic and Slovakia — continue to dominate in methamphetamine consumption, though that is changing slowly.

The report also looked beyond the European Union for the first time to compare residues at a global level, including cities in the United States and Brazil in its analysis.

Researchers tested the cities’ sewage systems for indications of how much cocaine the population is consuming, which they estimate in milligrams per 1,000 inhabitants per day (mg/1000p/day).

Wastewater studies measure only drugs that have been consumed, not those that were dumped, João Matias, a scientific analyst at the EMCDDA and one of the authors of the study, told InSight Crime.

“Once inside our bodies, the drug is metabolized. Once excreted to the sewage system, researchers can take samples before the water is treated. We look for the metabolites produced after the use of a specific substance,” said Matias.

Here, InSight Crime analyzes the report’s findings on the increasing prevalence of cocaine and methamphetamine outside of major cities in Europe, as well as new data from non-EU cities.

Publications Office of the European Union, Luxembourg 2024. 16p.