Hampshire · Water company

Portsmouth Water Hardness

Average 261 ppm across 34 postcodes served.

  • Range 237–287 ppm
  • Region Hampshire
  • Postcodes 34
Company average
261
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+
261
Avg ppm
237
Min ppm
287
Max ppm
34
Postcodes

About Portsmouth Water

Portsmouth Water serves 330,000 customers in the Portsmouth and Hampshire area. The chalk aquifer beneath the South Downs produces consistently hard water.

Distribution

Hardness Breakdown

0
Soft
(0%)
0
Slightly Hard
(0%)
0
Moderate
(0%)
34
Hard
(100%)
0
Very Hard
(0%)
All areas

Areas Served by Portsmouth Water

Every postcode district, sorted by hardness.

Postcode Town Hardness PPM Level
PO22 Bognor Regis
287
287 ppm Hard
PO21 Bognor Regis
286
286 ppm Hard
PO20 Chichester
285
285 ppm Hard
PO9 Havant
283
283 ppm Hard
PO8 Waterlooville
282
282 ppm Hard
PO7 Waterlooville
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
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
Recommended

Products for Portsmouth Water Customers

Popular choices for households on hard water.

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

A quick, affordable upgrade. Reduces chlorine and limescale at the showerhead — fits any standard UK shower hose in minutes. Protects skin and hair from hard water damage.

View on Amazon

Free Hard Water Action Plan

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