Anglian Water water hardness
Ranges from hard to very hard across the supply area.
Anglian Water supplies water ranging from hard to very hard across its area, so the figure for your own postcode is worth checking.
Large area on chalk aquifer, consistently hard. Limescale is a routine maintenance cost here rather than an occasional nuisance. Anglian's own factsheet sets its 'very hard' threshold at 350 mg/l, so parts of the region will exceed this band — check your postcode.
Correction, 2026-08-24: We previously showed 'very hard'. Anglian Water's own hardness factsheet sets its 'very hard' threshold at 350 mg/l CaCO3, and they publish no company-wide characterisation, so that claim was unsupported. Reduced to 'hard', which their chalk geology and published tables do support. Not band-verified: they publish hardness only per postcode.
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 Anglian Water supplies
Regions: East of England, East Midlands
Counties and areas: Norfolk, Suffolk, Cambridgeshire, Lincolnshire, Northamptonshire, Bedfordshire, Essex, Buckinghamshire
Supply boundaries do not follow county boundaries, and several companies may supply parts of the same county. Always check your own postcode.