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+

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.

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

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Products for Twickenham

Popular choices for households dealing with hard water.

Splendid Twin Tank Water Softener

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Philips Shower Filter

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BRITA Marella Water Filter Jug

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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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