Bristol Water water hardness
Ranges from hard to very hard across the supply area.
Bristol Water supplies water ranging from hard to very hard across its area, so the figure for your own postcode is worth checking.
All the water in the Bristol Water area is classed as moderately hard to very hard.
Bristol Water, on their own website, source — checked 2026-08-24
Mendip limestone sources. Hard, and noticeably harder than the neighbouring South West Water area — a useful reminder that county borders are not water borders.
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 Bristol Water supplies
Regions: South West England
Counties and areas: Bristol, Somerset, South Gloucestershire, Bath and North East Somerset
Supply boundaries do not follow county boundaries, and several companies may supply parts of the same county. Always check your own postcode.