Average 305 ppm across 58 postcodes and 2 towns.
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The average water hardness in Surrey is 305 ppm, classified as very hard. Across 58 postcode districts in the South East region, hardness ranges from 262 ppm to 344 ppm.
Surrey is served by Southern Water and Thames Water. With very hard water, residents may benefit from a water softener to reduce limescale and protect appliances.
Hardness varies across Surrey: Redhill has the hardest water at 321 ppm, while Guildford is the softest at 296 ppm. The county spans 2 towns and 58 postcode districts in total.
At 305 ppm, Surrey ranks as very hard water nationally. Compare it against the 50 hardest water areas in the UK.
Sorted by hardness — tap a town for full details.
Companies supplying water to this county.
Every postcode district in the county, sorted by hardness.
Top picks for households in very hard water areas.
Twin-tank electric softener sized for 1 to 7 bedroom homes. Removes limescale from pipes, boilers, and appliances and delivers continuous soft water, with metered regeneration to keep salt use low.
View on AmazonInstant improvement for skin and hair. Reduces chlorine and limescale at the showerhead, no plumbing needed. A good first step before committing to a full softener.
View on AmazonLearn more about water hardness and how to manage it.