Not all of London is equally hard. Central and South London (including zones 1 and 2) are the hardest of all. The further north you go, water tends to soften slightly, but it’s still harder than most of the UK.
Map shows how hard water is in your area | Metro News
Check your local water supplier’s website for a hardness map. Thames Water provides a postcode checker. It’s surprisingly addictive—you can see exactly how much rock you’re drinking.
Visiting from a soft water area? Your first week in London will feel like your hair has been dipped in wax. Don’t panic—your body adapts in about two weeks, or you can just buy a bottle of clarifying shampoo.
A Note on Taste
Some people actually prefer hard water’s taste. It has a distinct “body” and mouthfeel compared to the flat, neutral taste of soft water. It’s why London’s tap water makes for a decent cocktail mixer—the minerals add depth.
Breweries love it too. London’s hard water historically gave birth to the style of porter and stout beers. The minerals balanced the dark malt flavours, creating a taste that’s uniquely London.
So next time you sip your pint or your tea, know you’re part of a 2,000-year-old tradition. The water hasn’t changed much—you’ve just learned to live with its quirks.
