Ketamine Levels Rise in Hamburg Wastewater, Cocaine Stable
Hamburg, July 4, 2026 – Analysis of Hamburg’s wastewater has revealed a significant increase in ketamine residues, a potent anesthetic often used recreationally. This surge aligns with a broader European trend. Conversely, cocaine and its breakdown products, though still the most frequently detected substances, show stable levels in the city’s wastewater. These findings, based on data from the Institute for Hygiene and Environment, were disclosed following an inquiry by the CDU parliamentary group.
For precisely two years, Hamburg’s state laboratory has been regularly collecting and analyzing wastewater samples from the Köhlbrandhöft sewage treatment plant for drug residues. While cocaine and its metabolites consistently top the list of detected substances, their presence in Hamburg has remained largely stable. This contrasts with a rising trend observed in other major European cities, according to a comparison with current data from the European Union’s drug agency.
Cocaine Leads, THC Stable, Ketamine Surges
Tetrahydrocannabinol (THC), the psychoactive component in cannabis, also shows stable detection levels. However, the most striking finding is the marked increase in ketamine in the wastewater. This powerful anesthetic is now detected significantly more frequently than two years ago, mirroring a Europe-wide phenomenon. It is important to note that wastewater sampling for drug residues does not allow for a direct, one-to-one conclusion about actual consumption patterns. This is because substances like THC from cannabis are metabolized differently in the body compared to cocaine. Consequently, cocaine and its breakdown product occupy the top two positions in the wastewater monitoring, with THC following in third place.
Measurement Values as Indicators, Not Definitive Proof
In response to the CDU’s minor inquiry, the Senate highlighted further limitations of the data: "Changes between measurement points can also be influenced by various external factors, such as the temperature-dependent degradation rate of the analytes in the wastewater." For a reliable interpretation of the measured values, "a sufficient number of surveys are necessary, which are then evaluated; preliminary work and considerations for this are ongoing."
Fewer Drug Offenses in Hamburg, but ‘Drug Taxis’ a Growing Concern
Despite the findings in wastewater, the number of drug offenses in Hamburg has decreased across various categories, including crack, heroin, and cocaine. This is according to police crime statistics. However, a growing problem identified by authorities is the proliferation of ‘drug taxis,’ which facilitate drug distribution.
This topic was also featured in the NDR 90.3 radio program, ‘NDR 90.3 Aktuell,’ on April 7, 2026, at 12:00 PM.
The city’s continuous monitoring efforts aim to provide valuable insights into drug consumption trends, aiding public health initiatives and law enforcement strategies. While the data offers a snapshot of substance use, further research and comprehensive analysis are crucial for a complete understanding of the drug landscape in Hamburg.
The increase in ketamine levels raises concerns among health officials, prompting discussions on potential public health interventions and awareness campaigns. The stable cocaine levels, while not increasing, still signify a persistent challenge for the city.
Authorities emphasize that the wastewater analysis complements traditional methods of tracking drug use, offering an additional layer of information that can help in addressing drug-related issues more effectively. The ongoing work to refine data interpretation methods will further enhance the utility of this innovative monitoring approach.
