Datasets Use · not part of the score
Cannabis in wastewater
European Union Drugs Agency (EUDA) and the SCORE group · 2011 to 2024
Surveys depend on what people admit; sewage does not. The SCORE group and the European Union Drugs Agency measure THC-COOH, which the body makes from cannabis, in the wastewater of cities over one week a year, in milligrams a day per 1,000 people.[1] The highest recent loads are in the United States and Canada, around 600, followed by the Netherlands at about 200; the median of 33 countries is about 72.
The load depends on how much and how often people use, so it is not a count of users, and one city may stand for a whole country.[1] It is still the one measure that cannot be shaped by what people are willing to say about an illegal drug. The wastewater chart follows cities since 2011; compare with the survey figures in cannabis use.
- File here
- euda-wastewater-cannabis.csv
- of 220 places covered
- 33
- years in the file
- 2011–2024
- the median country
- 73
- places with several years
- 22
Cannabis in wastewater, on the map
The stronger the blue, the more THC-COOH a day per 1,000 people. One or a few cities stand for each country; countries with none measured since 2020 are hatched. Select a country for its profile.
cities measured: 1 · 14,166,000 people served
cities measured: 17 · 5,362,600 people served
cities measured: 6 · 1,531,089 people served
cities measured: 1 · 130,000 people served
cities measured: 13 · 23,968,523 people served
cities measured: 1 · 2,124,805 people served
cities measured: 3 · 830,505 people served
cities measured: 2 · 760,000 people served
cities measured: 7 · 2,355,793 people served
cities measured: 6 · 1,194,833 people served
cities measured: 2 · 580,000 people served
cities measured: 1 · 2,700,000 people served
cities measured: 3 · 1,110,839 people served
cities measured: 1 · 3,507,341 people served
cities measured: 1 · 912,698 people served
cities measured: 1 · 108,000 people served
cities measured: 1 · 1,980,000 people served
cities measured: 4 · 3,128,738 people served
cities measured: 1 · 157,873 people served
cities measured: 6 · 2,437,688 people served
cities measured: 3 · 1,259,011 people served
cities measured: 1 · 680,000 people served
cities measured: 3 · 715,649 people served
cities measured: 1 · 350,000 people served
cities measured: 2 · 594,659 people served
cities measured: 2 · 485,000 people served
cities measured: 7 · 658,101 people served
cities measured: 5 · 1,824,869 people served
cities measured: 5 · 1,055,558 people served
cities measured: 4 · 1,423,340 people served
cities measured: 2 · 21,260,531 people served
cities measured: 1 · 822,456 people served
cities measured: 1 · 893,000 people served
EUDA and SCORE group, wastewater monitoring, one week a year; cities averaged by the people each plant serves. Not part of the score.
Highest · Cannabis in wastewater
- United States5992024
- Canada5772024
- Netherlands1992024
Lowest · Cannabis in wastewater
- United Kingdom0.02022
- Türkiye172024
- Brazil212024
Country by country
Each place's latest figure, as on its profile. Select a heading to sort.
| Further figures | |||
|---|---|---|---|
| AustraliaOceania | 133.80mg of THC-COOH a day per 1,000 people | cities measured: 1 · 14,166,000 people served | 2024 |
| AustriaEurope | 73.90mg of THC-COOH a day per 1,000 people | cities measured: 17 · 5,362,600 people served | 2024 |
| BelgiumEurope | 86.10mg of THC-COOH a day per 1,000 people | cities measured: 6 · 1,531,089 people served | 2013 |
| Bosnia and HerzegovinaEurope | 39.80mg of THC-COOH a day per 1,000 people | cities measured: 1 · 130,000 people served | 2013 |
| BrazilSouth America | 20.90mg of THC-COOH a day per 1,000 people | cities measured: 13 · 23,968,523 people served | 2024 |
| CanadaNorth America | 577.30mg of THC-COOH a day per 1,000 people | cities measured: 1 · 2,124,805 people served | 2024 |
| ChileSouth America | 43.90mg of THC-COOH a day per 1,000 people | cities measured: 3 · 830,505 people served | 2024 |
| CroatiaEurope | 76.70mg of THC-COOH a day per 1,000 people | cities measured: 2 · 760,000 people served | 2024 |
| CzechiaEurope | 79.00mg of THC-COOH a day per 1,000 people | cities measured: 7 · 2,355,793 people served | 2024 |
| DenmarkEurope | 105.80mg of THC-COOH a day per 1,000 people | cities measured: 6 · 1,194,833 people served | 2024 |
| EstoniaEurope | 60.20mg of THC-COOH a day per 1,000 people | cities measured: 2 · 580,000 people served | 2023 |
| FranceEurope | 53.90mg of THC-COOH a day per 1,000 people | cities measured: 1 · 2,700,000 people served | 2024 |
| GermanyEurope | 50.70mg of THC-COOH a day per 1,000 people | cities measured: 3 · 1,110,839 people served | 2013 |
| GreeceEurope | 36.90mg of THC-COOH a day per 1,000 people | cities measured: 1 · 3,507,341 people served | 2024 |
| HungaryEurope | 56.80mg of THC-COOH a day per 1,000 people | cities measured: 1 · 912,698 people served | 2024 |
| IcelandEurope | 55.10mg of THC-COOH a day per 1,000 people | cities measured: 1 · 108,000 people served | 2024 |
| IrelandEurope | 98.10mg of THC-COOH a day per 1,000 people | cities measured: 1 · 1,980,000 people served | 2024 |
| ItalyEurope | 67.30mg of THC-COOH a day per 1,000 people | cities measured: 4 · 3,128,738 people served | 2024 |
| LuxembourgEurope | 140.40mg of THC-COOH a day per 1,000 people | cities measured: 1 · 157,873 people served | 2024 |
| NetherlandsEurope | 198.60mg of THC-COOH a day per 1,000 people | cities measured: 6 · 2,437,688 people served | 2024 |
| NorwayEurope | 151.50mg of THC-COOH a day per 1,000 people | cities measured: 3 · 1,259,011 people served | 2024 |
| PolandEurope | 41.70mg of THC-COOH a day per 1,000 people | cities measured: 1 · 680,000 people served | 2024 |
| PortugalEurope | 124.30mg of THC-COOH a day per 1,000 people | cities measured: 3 · 715,649 people served | 2024 |
| RomaniaEurope | 0.00mg of THC-COOH a day per 1,000 people | cities measured: 1 · 350,000 people served | 2013 |
| SerbiaEurope | 105.10mg of THC-COOH a day per 1,000 people | cities measured: 2 · 594,659 people served | 2013 |
| SlovakiaEurope | 58.00mg of THC-COOH a day per 1,000 people | cities measured: 2 · 485,000 people served | 2024 |
| SloveniaEurope | 72.40mg of THC-COOH a day per 1,000 people | cities measured: 7 · 658,101 people served | 2024 |
| SpainEurope | 185.20mg of THC-COOH a day per 1,000 people | cities measured: 5 · 1,824,869 people served | 2024 |
| SwedenEurope | 53.90mg of THC-COOH a day per 1,000 people | cities measured: 5 · 1,055,558 people served | 2024 |
| SwitzerlandEurope | 88.70mg of THC-COOH a day per 1,000 people | cities measured: 4 · 1,423,340 people served | 2024 |
| TürkiyeAsia | 16.60mg of THC-COOH a day per 1,000 people | cities measured: 2 · 21,260,531 people served | 2024 |
| United KingdomEurope | 0.00mg of THC-COOH a day per 1,000 people | cities measured: 1 · 822,456 people served | 2022 |
| United StatesNorth America | 598.50mg of THC-COOH a day per 1,000 people | cities measured: 1 · 893,000 people served | 2024 |
What is counted, and how the file was made
THC-COOH, the main substance the body makes from cannabis, measured in the sewage of cities over one week a year: milligrams a day per 1,000 people served. Not a count of users, as the load depends on how much and how often people use; but it measures what is used rather than what people admit. A country's figure is the mean of its measured cities, weighted by the people each plant serves; one city may stand for a whole country.
The EUDA's site refuses scripted downloads, so its tables 1 and 2 were read in a browser on 21 October 2026; the cannabis rows, with each site's population, are kept in euda-wastewater-cannabis-cities.csv. scripts/extract-wastewater.py averages them by country and year.
The file belongs to EUDA and keeps its terms; cite the publisher when you use it.