It analysed samples collected over a one-week period between March and April last year for traces of cocaine, amphetamine, methamphetamine, MDMA/ecstasy, ketamine and cannabis and found drug-use was greater than in previous studies.
Water flows out of a sewage treatment plant in Brandenburg on Sept. 10, 2021. A study analyzing wastewater found that cocaine use has risen across Europe. (Soeren Stache/picture alliance via Getty Images)
"Today's findings, from a record 104 cities, paint a picture of a drugs problem that is both widespread and complex, with all six substances detected in almost every location," EMCDDA director Alexis Goosdeel said in a statement.
The results showed a "continued rise in cocaine detections", a trend observed since 2016, and that more cities had reported traces of methamphetamine, also known as crystal meth.
More than half of the 66 European cities with data for 2021 and 2022 recorded increases in cocaine residues.
Ketamine was included for the first time in the 2022 analysis due to "signs of increased availability of ketamine in Europe". The highest amount of residues were found in wastewater in cities in Denmark, Italy, Portugal and Spain.