Safe
United Kingdom
Is Tap Water Safe to Drink in London?
Yes, tap water in London is safe to drink and meets strict UK regulatory standards, though it is among the hardest in the country due to the region's chalk and limestone geology.
Hardness
Very hard
Country
United Kingdom
Rating
Safe
Water Source
Thames Water supplies London primarily from the River Thames and River Lee, along with groundwater from underlying chalk aquifers, treated at several major works including the Thames Water Ring Main.
Contaminants & Concerns
No significant health concerns. Heavy limescale from hard water is the most common household complaint.
Tips
- •Kitchen cold tap is the drinking water tap; some older properties have separate unfiltered bathroom supplies
- •A filter jug (e.g., Brita) is common in London households mainly for taste and limescale
- •Tap water refill points are widely available across the city