WaterHard.uk

Is Southampton Water Hard or Soft?

Hard at 219 ppm • Hampshire, South East

219 PPM 0 200 400
Hard

The average water hardness in Southampton is 219 ppm, classified as hard. Southampton is served by Severn Trent Water, covering 23 postcode districts across Hampshire in the South East region.

Hardness varies across the area — see the table below for a breakdown by postcode district.

Water Hardness by Postcode in Southampton

Postcode Water Company Hardness PPM Level
SO45 Severn Trent Water
286 ppm
286 ppm Hard
SO43 Severn Trent Water
284 ppm
284 ppm Hard
SO42 Severn Trent Water
283 ppm
283 ppm Hard
SO41 Severn Trent Water
282 ppm
282 ppm Hard
SO40 Severn Trent Water
281 ppm
281 ppm Hard
SO32 Severn Trent Water
250 ppm
250 ppm Hard
SO31 Severn Trent Water
249 ppm
249 ppm Hard
SO30 Severn Trent Water
248 ppm
248 ppm Hard
SO24 Severn Trent Water
219 ppm
219 ppm Hard
SO23 Severn Trent Water
218 ppm
218 ppm Hard
SO22 Severn Trent Water
217 ppm
217 ppm Hard
SO21 Severn Trent Water
216 ppm
216 ppm Hard
SO20 Severn Trent Water
215 ppm
215 ppm Hard
SO19 Severn Trent Water
191 ppm
191 ppm Hard
SO18 Severn Trent Water
190 ppm
190 ppm Hard
SO17 Severn Trent Water
189 ppm
189 ppm Hard
SO16 Severn Trent Water
188 ppm
188 ppm Hard
SO15 Severn Trent Water
187 ppm
187 ppm Hard
SO14 Severn Trent Water
186 ppm
186 ppm Hard
SO53 Severn Trent Water
166 ppm
166 ppm Moderately Hard
SO52 Severn Trent Water
165 ppm
165 ppm Moderately Hard
SO51 Severn Trent Water
164 ppm
164 ppm Moderately Hard
SO50 Severn Trent Water
163 ppm
163 ppm Moderately Hard

Water Companies Serving Southampton

Severn Trent Water

Average hardness: 222 ppm (Hard) • 345 postcodes served

Water Hardness Guides

What Is Water Hardness? Effects Solutions Water Softeners Limescale Removal

Recommended Products for Southampton

Popular choices for households dealing with hard water in this area.

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.

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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.

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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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