South East · County

Water hardness in Hampshire

Average 244 ppm across 57 postcodes and 2 towns.

  • Range 163–287 ppm
  • Towns 2
  • Suppliers Portsmouth Water, Severn Trent Water
County average
244
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+
244
Avg ppm
163
Min ppm
287
Max ppm
57
Postcodes

Water Hardness Across Hampshire

The average water hardness in Hampshire is 244 ppm, classified as hard. Across 57 postcode districts in the South East region, hardness ranges from 163 ppm to 287 ppm.

Hampshire is served by Portsmouth Water and Severn Trent Water. With hard water, residents may benefit from a water softener to reduce limescale and protect appliances.

By town

Towns in Hampshire

Sorted by hardness — tap a town for full details.

Town Hardness PPM Level
Portsmouth
261
261 ppm Hard
Southampton
219
219 ppm Hard
Suppliers

Water Companies in Hampshire

Companies supplying water to this county.

Portsmouth Water

261 ppm Hard

Severn Trent Water

222 ppm Hard
All postcodes

Postcodes in Hampshire

Every postcode district in the county, sorted by hardness.

Postcode Town Hardness PPM Level
PO22 Bognor Regis
287
287 ppm Hard
PO21 Bognor Regis
286
286 ppm Hard
SO45 Southampton
286
286 ppm Hard
PO20 Chichester
285
285 ppm Hard
SO43 Lyndhurst
284
284 ppm Hard
PO9 Havant
283
283 ppm Hard
SO42 Brockenhurst
283
283 ppm Hard
PO8 Waterlooville
282
282 ppm Hard
SO41 Lymington
282
282 ppm Hard
PO7 Waterlooville
281
281 ppm Hard
SO40 Southampton
281
281 ppm Hard
PO6 Portsmouth
280
280 ppm Hard
PO5 Southsea
279
279 ppm Hard
PO4 Southsea
278
278 ppm Hard
PO3 Portsmouth
277
277 ppm Hard
PO2 Portsmouth
276
276 ppm Hard
PO1 Portsmouth
275
275 ppm Hard
PO41 Yarmouth
271
271 ppm Hard
PO40 Freshwater
270
270 ppm Hard
PO19 Chichester
261
261 ppm Hard
PO18 Chichester
260
260 ppm Hard
PO17 Fareham
259
259 ppm Hard
PO16 Fareham
258
258 ppm Hard
PO15 Fareham
257
257 ppm Hard
PO14 Fareham
256
256 ppm Hard
PO13 Gosport
255
255 ppm Hard
PO12 Gosport
254
254 ppm Hard
PO11 Hayling Island
253
253 ppm Hard
PO10 Emsworth
252
252 ppm Hard
SO32 Southampton
250
250 ppm Hard
SO31 Southampton
249
249 ppm Hard
SO30 Southampton
248
248 ppm Hard
PO39 Totland Bay
246
246 ppm Hard
PO38 Ventnor
245
245 ppm Hard
PO37 Shanklin
244
244 ppm Hard
PO36 Sandown
243
243 ppm Hard
PO35 Bembridge
242
242 ppm Hard
PO34 Seaview
241
241 ppm Hard
PO33 Ryde
240
240 ppm Hard
PO32 East Cowes
239
239 ppm Hard
PO31 Cowes
238
238 ppm Hard
PO30 Newport
237
237 ppm Hard
SO24 Alresford
219
219 ppm Hard
SO23 Winchester
218
218 ppm Hard
SO22 Winchester
217
217 ppm Hard
SO21 Winchester
216
216 ppm Hard
SO20 Stockbridge
215
215 ppm Hard
SO19 Southampton
191
191 ppm Hard
SO18 Southampton
190
190 ppm Hard
SO17 Southampton
189
189 ppm Hard
SO16 Southampton
188
188 ppm Hard
SO15 Southampton
187
187 ppm Hard
SO14 Southampton
186
186 ppm Hard
SO53 Eastleigh
166
166 ppm Moderately Hard
SO52 Southampton
165
165 ppm Moderately Hard
SO51 Romsey
164
164 ppm Moderately Hard
SO50 Eastleigh
163
163 ppm Moderately Hard
Recommended

Products for Hampshire

Top picks for households in hard water areas.

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.

View on Amazon

Philips AWP1775 Shower Filter

From ~£30

Instant improvement for skin and hair. Reduces chlorine and limescale at the showerhead — no plumbing needed. A good first step before committing to a full softener.

View on Amazon

Hard Water Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Hard Water Effects Solutions
All counties in South East · Hardest water areas · Softest water areas · Hard water solutions

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