Surrey · South East

Is Redhill water hard or soft?

Very Hard at 321 ppm · 20 postcode districts

Supplier Southern Water
County Surrey
Postcodes 20

Area average

321

ppm CaCO₃

Very Hard

Soft

Moderate

Hard

Very hard

0100200300400+

The average water hardness in Redhill is 321 ppm, classified as very hard. Redhill is served by Southern Water, covering 20 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 Redhill

Sorted by hardness — tap a postcode for full details.

Postcode	Water Company	Hardness	PPM	Level
RH20	Southern Water	344	344 ppm	Very Hard
RH9	Southern Water	329	329 ppm	Very Hard
RH8	Southern Water	328	328 ppm	Very Hard
RH7	Southern Water	327	327 ppm	Very Hard
RH6	Southern Water	326	326 ppm	Very Hard
RH5	Southern Water	325	325 ppm	Very Hard
RH4	Southern Water	324	324 ppm	Very Hard
RH3	Southern Water	323	323 ppm	Very Hard
RH2	Southern Water	322	322 ppm	Very Hard
RH1	Southern Water	321	321 ppm	Very Hard
RH19	Southern Water	320	320 ppm	Very Hard
RH18	Southern Water	319	319 ppm	Very Hard
RH17	Southern Water	318	318 ppm	Very Hard
RH16	Southern Water	317	317 ppm	Very Hard
RH15	Southern Water	316	316 ppm	Very Hard
RH14	Southern Water	315	315 ppm	Very Hard
RH13	Southern Water	314	314 ppm	Very Hard
RH12	Southern Water	313	313 ppm	Very Hard
RH11	Southern Water	312	312 ppm	Very Hard
RH10	Southern Water	311	311 ppm	Very Hard

Suppliers

Water Companies Serving Redhill

Tap for full coverage area and hardness data.

Southern Water

263 ppm 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 Redhill

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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