Hard Water and Eczema: The UK Evidence

Does hard water worsen eczema?

Many people with eczema report that hard water makes their skin worse. The UK Biobank study and other research have looked at whether there is a real link between water hardness and eczema prevalence across the UK.

What the research shows

Hard water contains higher levels of calcium and magnesium. Some studies suggest these minerals can disrupt the skin barrier and increase irritation, particularly in people who already have eczema or sensitive skin. The evidence is not conclusive, but if you live in a hard water area and struggle with dry skin or eczema, it may be worth checking your local water hardness.

Check your postcode

Water hardness varies significantly across the UK. Use our free postcode search to see the hardness level and chemical readings for your area — sourced from the Drinking Water Inspectorate.