Cambridge Water water hardness
Cambridge Water supplies water that is typically hard.
All of the water we supply is 'hard', together with more than 60% of homes in the UK.
Cambridge Water, on their own website, source — checked 2026-08-24
Entirely chalk borehole supply, and Cambridge Water states that all the water it supplies is hard, with little variation across the area. One of the most consistently hard supplies in the country.
Correction, 2026-08-24: Cambridge Water describes its own supply as "hard", not "very hard".
What this means for your home
You have hard water — scale protection is worth having.
The World Health Organization notes that water at 200 mg/l or above will produce scale, and that is where this band begins. At this level limescale is a recurring cost rather than an occasional nuisance, and many boiler manufacturers require scale protection to keep the warranty valid. A softener is worth costing out properly.
Where Cambridge Water supplies
Regions: East of England
Counties and areas: Cambridgeshire
Supply boundaries do not follow county boundaries, and several companies may supply parts of the same county. Always check your own postcode.