Surrey · South East

Is Guildford water hard or soft?

Hard at 296 ppm · 38 postcode districts

  • Supplier Thames Water
  • County Surrey
  • Postcodes 38
Area average
296
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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.

By postcode

Water Hardness by Postcode in Guildford

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
GU35 Thames Water
333
333 ppm Very Hard
GU34 Thames Water
332
332 ppm Very Hard
GU33 Thames Water
331
331 ppm Very Hard
GU32 Thames Water
330
330 ppm Very Hard
GU31 Thames Water
329
329 ppm Very Hard
GU30 Thames Water
328
328 ppm Very Hard
GU9 Thames Water
311
311 ppm Very Hard
GU8 Thames Water
310
310 ppm Very Hard
GU7 Thames Water
309
309 ppm Very Hard
GU6 Thames Water
308
308 ppm Very Hard
GU5 Thames Water
307
307 ppm Very Hard
GU4 Thames Water
306
306 ppm Very Hard
GU3 Thames Water
305
305 ppm Very Hard
GU2 Thames Water
304
304 ppm Very Hard
GU29 Thames Water
304
304 ppm Very Hard
GU1 Thames Water
303
303 ppm Very Hard
GU28 Thames Water
303
303 ppm Very Hard
GU27 Thames Water
302
302 ppm Very Hard
GU26 Thames Water
301
301 ppm Very Hard
GU25 Thames Water
300
300 ppm Hard
GU24 Thames Water
299
299 ppm Hard
GU23 Thames Water
298
298 ppm Hard
GU22 Thames Water
297
297 ppm Hard
GU21 Thames Water
296
296 ppm Hard
GU20 Thames Water
295
295 ppm Hard
GU52 Thames Water
295
295 ppm Hard
GU51 Thames Water
294
294 ppm Hard
GU19 Thames Water
271
271 ppm Hard
GU18 Thames Water
270
270 ppm Hard
GU17 Thames Water
269
269 ppm Hard
GU16 Thames Water
268
268 ppm Hard
GU15 Thames Water
267
267 ppm Hard
GU47 Thames Water
267
267 ppm Hard
GU14 Thames Water
266
266 ppm Hard
GU46 Thames Water
266
266 ppm Hard
GU12 Thames Water
264
264 ppm Hard
GU11 Thames Water
263
263 ppm Hard
GU10 Thames Water
262
262 ppm Hard
Suppliers

Water Companies Serving Guildford

Tap for full coverage area and hardness data.

Thames Water

302 ppm Very Hard

Water Hardness Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Effects Solutions Water Softeners Limescale Removal
Recommended

Products for Guildford

Popular choices for households dealing with hard water.

Water2Buy W2B200 Water Softener

From ~£400

Best-value whole-house ion-exchange softener for UK homes. Eliminates limescale from pipes, boilers, and appliances. Digital metered regeneration — low salt use. 7-year warranty.

View on Amazon

Philips AWP1775 Shower Filter

From ~£30

Quick win for skin and hair in hard water areas. Reduces chlorine and limescale — fits standard shower hoses in minutes, no tools needed. Cartridge lasts ~6 months.

View on Amazon

BRITA Marella Water Filter Jug

From ~£20

UK's best-selling filter jug. Reduces limescale, chlorine, and metals for better-tasting tap water. Quick first step alongside a softener.

View on Amazon

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