England
The capital serves over 9 million people through Thames Water, one of the UK's largest water suppliers.
Average score
8.3/10
UK avg: 9.1/10
Areas tested
80
Issues flagged
113
PFAS detected
None
Yes, London tap water is safe to drink. Based on 80 areas tested, London has an average water quality score of 8.3/10 (below the UK average of 9.1/10). 113 contaminants were flagged above recommended levels across all areas. Water is supplied by Thames Water. The capital serves over 9 million people through Thames Water, one of the UK's largest water suppliers.
Contaminants flagged most often across the city.
All postcode districts in London, ranked by water quality score.
Learn more about the water quality issues relevant to this area.
Get a detailed water quality report for your exact area in London.