Greater London · London

Is Twickenham water hard or soft?

Hard at 284 ppm · 19 postcode districts

  • Supplier Thames Water
  • County Greater London
  • Postcodes 19
Area average
284
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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The average water hardness in Twickenham is 284 ppm, classified as hard. Twickenham is served by Thames Water, covering 19 postcode districts across Greater London in the London region.

Hardness varies across the area — see the table below for a breakdown by postcode district. TW20 has the hardest water at 307 ppm, while TW10 is the softest at 274 ppm.

By postcode

Water Hardness by Postcode in Twickenham

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
TW20 Thames Water
307
307 ppm Very Hard
TW9 Thames Water
293
293 ppm Hard
TW8 Thames Water
292
292 ppm Hard
TW7 Thames Water
291
291 ppm Hard
TW5 Thames Water
289
289 ppm Hard
TW4 Thames Water
288
288 ppm Hard
TW3 Thames Water
287
287 ppm Hard
TW2 Thames Water
286
286 ppm Hard
TW1 Thames Water
285
285 ppm Hard
TW19 Thames Water
283
283 ppm Hard
TW18 Thames Water
282
282 ppm Hard
TW17 Thames Water
281
281 ppm Hard
TW16 Thames Water
280
280 ppm Hard
TW15 Thames Water
279
279 ppm Hard
TW14 Thames Water
278
278 ppm Hard
TW13 Thames Water
277
277 ppm Hard
TW12 Thames Water
276
276 ppm Hard
TW11 Thames Water
275
275 ppm Hard
TW10 Thames Water
274
274 ppm Hard
Suppliers

Water Companies Serving Twickenham

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 Twickenham

Popular choices for households dealing with 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 Twickenham water

Is Twickenham water hard or soft?
Twickenham is classified as hard, averaging 284 ppm across 19 postcode districts. Expect visible limescale on kettles and taps within weeks at this level.
Which postcode in Twickenham has the hardest water?
TW20 has the hardest water in Twickenham at 307 ppm, while TW10 is the softest at 274 ppm. See the full table above for every district.
Which water company supplies Twickenham?
Twickenham is supplied by Thames Water, covering 19 postcode districts across Greater London.
Is tap water in Twickenham safe to drink?
Yes. All tap water in Twickenham meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Do I need a water softener in Twickenham?
At 284 ppm, many households in Twickenham 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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