Hard at 296 ppm · 38 postcode districts
The average water hardness in Guildford is 296 ppm, classified as hard. Guildford is served by Thames Water, covering 38 postcode districts across Surrey in the South East region.
Hardness varies across the area — see the table below for a breakdown by postcode district.
Sorted by hardness — tap a postcode for full details.
Tap for full coverage area and hardness data.
Learn more about water hardness and how to manage it.
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