Analysis of Illegal Drug Use in England Using Wastewater Monitoring

Apr 27, 2026, 10:38

Introduction

A 2022 study commissioned by the Home Office and carried out by Imperial College London used wastewater analysis to measure drug use trends across England.

Main Body

The researchers examined over 1,700 samples from 15 water treatment plants to identify 20 different compounds, including illegal drugs and their chemical by-products. The data showed that cocaine was the most common substance by daily volume, with an estimated 12 tonnes consumed annually across the monitored areas. While cocaine and MDMA use peaked during weekends, cocaine remained present throughout the week. In contrast, ketamine use showed a stable daily pattern, and seven English sites recorded higher levels than any other monitored locations in Europe. Analysis showed that drug use increased during specific events, such as bank holidays, summer heatwaves, and major sporting events like the World Cup and the Queen's platinum jubilee. The Eurovision song contest was a notable example, as it coincided with higher levels of cocaine, ketamine, MDMA, and methamphetamine. Experts emphasized that these findings can help the government allocate emergency services more effectively and improve public health warnings during high-risk periods. Furthermore, the data suggests that police efforts to stop drug trafficking directly affect consumption. For example, after 3.7 tonnes of cocaine were seized at Southampton docks in March 2022, drug use dropped in three different cities for one month. This supports government claims that stronger border security disrupts criminal supply chains. Meanwhile, the National Crime Agency criticized the common belief among 16 to 24-year-olds that ketamine is low-risk, warning about serious health issues such as bladder failure and memory loss.

Conclusion

The study provides a clear baseline for drug use in England. It demonstrates that while some drugs are used more during specific events, others are used daily, and that stopping the supply of drugs can successfully reduce local consumption.

Vocabulary Learning

commissioned (v.)

委託 / to give someone a job or responsibility委託

Example:The Home Office commissioned the study to assess drug usage.

disrupts (v.)

干擾 / to disturb the normal functioning of something干擾

Example:Border security disrupts criminal supply chains.

examined (v.)

檢查 / to look at carefully in order to learn about something檢查

Example:The researchers examined over 1,700 samples.

increased (v.)

增加 / to become larger or greater增加

Example:Drug use increased during bank holidays.

monitored (v.)

監測 / to watch something closely over a period of time監測

Example:The data was monitored for changes.

Sentence Learning

For example, after 3.7 tonnes of cocaine were seized at Southampton docks in March 2022, drug use dropped in three different cities for one month.

Passive Voice: The sentence uses the passive voice to describe an action performed on the subject. The verb 'were seized' is in the passive form, indicating that the cocaine was taken by an unspecified agent.被動語態: 這句子使用被動語態來描述動作的受詞。動詞 'were seized' 以被動形式出現，表示可卡因被不明的行動者採取。

Meanwhile, the National Crime Agency criticized the common belief among 16 to 24-year-olds that ketamine is low-risk, warning about serious health issues such as bladder failure and memory loss.

Relative Clause: The clause 'that ketamine is low-risk' provides additional information about the belief held by 16 to 24-year-olds. It restricts the noun phrase 'common belief' to a specific type of belief.關係子句: 這個子句 'that ketamine is low-risk' 為 'common belief' 提供了額外資訊，限定了 16 到 24 歲年齡層的特定信念。

While cocaine and MDMA use peaked during weekends, cocaine remained present throughout the week.

Contrastive Conjunction: The conjunction 'While' introduces a contrast between two situations: peak use on weekends versus continuous presence during the week.對比連接詞: 'While' 這個連接詞用於對比兩個情況：週末用量高峰與整週持續存在。

Experts emphasized that these findings can help the government allocate emergency services more effectively and improve public health warnings during high-risk periods.

Modal Verb: The modal verb 'can' expresses possibility, indicating that the findings have the potential to help the government.情態動詞: 'can' 表示可能性，說明研究結果有可能幫助政府。

The data showed that cocaine was the most common substance by daily volume, with an estimated 12 tonnes consumed annually across the monitored areas.

Noun Clause: The noun clause 'that cocaine was the most common substance' functions as the object of the verb 'showed', reporting the data's content.名詞子句: 'that cocaine was the most common substance' 作為動詞 'showed' 的賓語，報告數據的內容。