About WaterHard.uk

WaterHard.uk is a free resource that helps UK residents check the hardness of their water supply. We cover over 2,000 postcode districts across England, Scotland, Wales, and Northern Ireland.

Our Data

Water hardness data is compiled from publicly available reports published by UK water companies including Thames Water, Anglian Water, Severn Trent, Yorkshire Water, United Utilities, Scottish Water, Welsh Water, and others. Hardness levels are measured in parts per million (ppm) of calcium carbonate.

Water hardness can vary slightly within a postcode district depending on the specific supply zone. The values shown represent the typical hardness for each district based on the primary water source.

How to Use This Site

1. Enter your postcode in the search box on any page
2. View your area's hardness level, PPM reading, and water company
3. Understand what your hardness level means for your home
4. Explore solutions if you have hard water

Affiliate Disclosure

WaterHard.uk is a participant in the Amazon Associates Programme. Some pages contain affiliate links — if you make a purchase through these links, we earn a small commission at no extra cost to you. This helps us maintain the site and keep it free.

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