Drinking Water Safety

Is it safe to drink tap water in London? Yes

Water Drinkable Score: 85/100

Tap water in London is sourced primarily from the River Thames and River Lea, supplemented by reservoirs. It contains minerals such as calcium and magnesium, contributing to its relatively hard quality, though its safety has been well-maintained over time. The Drinking Water Inspectorate monitors water quality, with Thames Water being the principal distribution company responsible for supplying water to the city.

Sources

https://www.thameswater.co.uk/help/emergencies/water-quality

https://www.london.gov.uk/WHAT-WE-DO/environment/environment-publications/safeguarding-londons-water