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Instant Hardness Level
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Water hardness is measured in parts per million (ppm). Here is what the numbers mean for your home.
Lucky you — no softener needed. Found in parts of Scotland, Wales, and the North West. Minimal limescale.
Some limescale buildup over time. A softener is optional but beneficial for appliance longevity and skin comfort.
Noticeable limescale on taps, kettles, and showerheads. A water softener is strongly recommended. Covers most of the Midlands and East Anglia.
Heavy limescale. Boiler efficiency drops, pipes fur up, skin and hair feel dry. A softener will make a significant difference. Covers London, the South East, and much of Eastern England.
Water hardness varies dramatically across the UK. Southern and eastern England have the hardest water, while Scotland, Wales, and the North West are predominantly soft.
London, South East England, East Anglia, Essex, Kent, Sussex, Surrey, Hampshire (east), Hertfordshire, Cambridgeshire, Norfolk, Suffolk, Lincolnshire (south)
East Midlands, Yorkshire (east), Oxfordshire, Buckinghamshire, Bedfordshire, Northamptonshire, Warwickshire (east), Nottinghamshire
North East England, West Midlands, parts of Yorkshire (west), Derbyshire, Staffordshire, Herefordshire
Scotland, Wales, North West England, South West England, Lake District, Cumbria, Cornwall, Devon, Lancashire, Greater Manchester
Not sure about your area? Enter your postcode in our wizard and your installer will confirm your exact hardness level.
In a hard water area? Request quotes from available installers in your postcode area.
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Common questions about water hardness in the UK.
Enter your postcode on your water supplier’s website or use a free online postcode checker. The result will show your hardness in ppm or mg/l. You can also buy a test strip kit from Amazon for under £5.
Hard water forms when rainwater passes through chalk and limestone rock, picking up calcium and magnesium minerals. Areas with these geological formations — most of southern and eastern England — have harder water.
Hard water is safe to drink. The health concern is indirect: limescale buildup reduces boiler efficiency, damages appliances, and can irritate sensitive skin. The financial and practical impact is where most people notice it.
Yes. A water softener removes the calcium and magnesium minerals through ion exchange. Softened water eliminates limescale buildup and makes soap, shampoo, and detergent work more effectively.
Request prices from available installers in your area. Free, no-obligation.