Greater London · London

Is Kingston Upon Thames water hard or soft?

Very Hard at 310 ppm · 24 postcode districts

  • Supplier Thames Water
  • County Greater London
  • Postcodes 24
Area average
310
ppm CaCO₃
Very Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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The average water hardness in Kingston Upon Thames is 310 ppm, classified as very hard. Kingston Upon Thames is served by Thames Water, covering 24 postcode districts across Greater London in the London region.

Hardness varies across the area — see the table below for a breakdown by postcode district. KT24 has the hardest water at 346 ppm, while KT1 is the softest at 283 ppm.

By postcode

Water Hardness by Postcode in Kingston Upon Thames

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
KT24 Thames Water
346
346 ppm Very Hard
KT23 Thames Water
345
345 ppm Very Hard
KT22 Thames Water
344
344 ppm Very Hard
KT21 Thames Water
343
343 ppm Very Hard
KT20 Thames Water
342
342 ppm Very Hard
KT19 Thames Water
318
318 ppm Very Hard
KT18 Thames Water
317
317 ppm Very Hard
KT17 Thames Water
316
316 ppm Very Hard
KT16 Thames Water
315
315 ppm Very Hard
KT15 Thames Water
314
314 ppm Very Hard
KT14 Thames Water
313
313 ppm Very Hard
KT13 Thames Water
312
312 ppm Very Hard
KT12 Thames Water
311
311 ppm Very Hard
KT11 Thames Water
310
310 ppm Very Hard
KT10 Thames Water
309
309 ppm Very Hard
KT9 Thames Water
291
291 ppm Hard
KT8 Thames Water
290
290 ppm Hard
KT7 Thames Water
289
289 ppm Hard
KT6 Thames Water
288
288 ppm Hard
KT5 Thames Water
287
287 ppm Hard
KT4 Thames Water
286
286 ppm Hard
KT3 Thames Water
285
285 ppm Hard
KT2 Thames Water
284
284 ppm Hard
KT1 Thames Water
283
283 ppm Hard
Suppliers

Water Companies Serving Kingston Upon Thames

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 Kingston Upon Thames

Popular choices for households dealing with very hard water.

Splendid Twin Tank Water Softener

From ~£400

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.

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Philips 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 around 6 months.

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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.

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FAQ

Common questions about Kingston Upon Thames water

Is Kingston Upon Thames water hard or soft?
Kingston Upon Thames is classified as very hard, averaging 310 ppm across 24 postcode districts. Expect visible limescale on kettles and taps within weeks at this level.
Which postcode in Kingston Upon Thames has the hardest water?
KT24 has the hardest water in Kingston Upon Thames at 346 ppm, while KT1 is the softest at 283 ppm. See the full table above for every district.
Which water company supplies Kingston Upon Thames?
Kingston Upon Thames is supplied by Thames Water, covering 24 postcode districts across Greater London.
Is tap water in Kingston Upon Thames safe to drink?
Yes. All tap water in Kingston Upon Thames meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Do I need a water softener in Kingston Upon Thames?
At 310 ppm, many households in Kingston Upon Thames notice limescale in kettles and showerheads within weeks. A shower filter is the cheapest first step; a whole-house softener gives the most complete protection.
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