Water Hardness Level by City, Town & Region in the UK & Ireland
Looking for your local water hardness value in the UK or Ireland - we've got it! We’ve contacted water suppliers to obtain their actual measured values. Just find your city, town, county/council area and postcode/Eircode below to see how hard your water is. We have the hardness values available in gpg, mg/l, Clark, German and French degrees - so whatever unit your appliance uses, you'll have the right number on hand!
Knowing if you have hard water and your water hardness value is really useful info in making decisions about all sorts of things such as home appliance selection, laundry, cooking, cleaning, home brewing, skin care, and much more.
Five Units of Water Hardness
Water hardness is measured in several units, depending on the country and the product. Different appliance manuals and softener brands use different hardness units, so every chart gives you all of them side by side.
- mg/l
- Milligrams per litre
- The unit used by water suppliers across the UK and Ireland.
- gpg
- Grains per gallon
- The standard for sizing water softeners, based on the US gallon.
- °Clark
- Clark degrees
- The traditional British unit, also called English degrees.
- °dH
- German degrees
- Found on many dishwashers, coffee machines and test strips.
- °fH
- French degrees
- Common across Europe and on many appliances sold in the UK.