Despite the Class A honour bestowed upon the city, it has had to surrender its crown as apparently the dealers and sniffers just can't keep up.
Dethroning our capital is Antwerp, in Belgium, with the result being discovered by an EU drug monitoring agency.
The agency found that the average daily concentration of cocaine in Antwerp's sewer water was 914.8mg per 1,000 people a day, according to the Guardian.
Clearly the introduction of the new plastic fivers has stunted Londoner's cocaine intake, an issue that'll be tripled once the new tenners and £20 notes roll out.
The Belgium city only just edged out London, which had a reported 894.9mg of blow in its sewerage per 1,000 people per day, which isn't a statistic to turn your nose up at.
I wouldn't be too disheartened by the result Cockneys, the city probably makes up for it with weed smoking.
Featured image credit: PA