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

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Portsmouth Water Water Hardness Summary

Portsmouth Water water is hard, averaging 261 ppm as calcium carbonate, ranging from 237 to 287 ppm across 34 postcode districts in Hampshire.

Average hardness261 ppm (Hard)
Hardness range237 to 287 ppm
ClassificationHard
Districts served34
RegionHampshire

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.

At 261 ppm on average, Portsmouth Water ranks as hard water. See how it compares across the UK in our 50 hardest water areas ranking.

Worth reading: our water softener guide compares the options for Portsmouth Water customers, and our limescale removal guide has quick fixes for kettles, taps, and boilers.

Cross-check this against Portsmouth Water's own data: Portsmouth Water water hardness report. Find your supply zone on the map, then download the matching PDF to read your average water hardness and quality results.

Comparison

Portsmouth Water vs Other UK Water Companies

Average hardness across the 15 largest UK water suppliers, hardest first. Your supplier is highlighted.

RankWater companyAvg ppmClassificationDistricts
1 Anglian Water 321 ppm Very Hard 261
2 Thames Water 302 ppm Very Hard 412
3 South East Water 297 ppm Hard 17
4 Affinity Water 268 ppm Hard 32
5 Southern Water 263 ppm Hard 131
6 Portsmouth Water 261 ppm Hard 34
7 SES Water 239 ppm Hard 7
8 Wessex Water 231 ppm Hard 123
9 Severn Trent Water 222 ppm Hard 345
10 Yorkshire Water 215 ppm Hard 217
11 Northumbrian Water 101 ppm Slightly Hard 122
12 South West Water 80 ppm Slightly Hard 129
13 United Utilities 77 ppm Slightly Hard 242
14 Welsh Water (Dwr Cymru) 68 ppm Slightly Hard 214
15 Scottish Water 54 ppm Soft 3
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.

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.

View on Amazon

Philips 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
FAQ

Common questions about Portsmouth Water water hardness

How do I check Portsmouth Water hardness by postcode?
Enter your postcode in the checker on the WaterHard.uk homepage, or find your district in the table above. Portsmouth Water serves 34 postcode districts across Hampshire, ranging from 237 to 287 ppm.
Is there a Portsmouth Water hardness checker or map?
Portsmouth Water publishes water quality data by postcode, but it can be scattered across PDF reports. WaterHard.uk compiles it into the searchable table above so you can find your district's reading in one place.
How hard is Portsmouth Water water in my area?
It depends on your exact postcode. Portsmouth Water supplies range from 237 ppm to 287 ppm, averaging 261 ppm (hard) across 34 postcode districts in Hampshire. Use the table above to find your specific district.
Do I need a water softener with Portsmouth Water?
At 261 ppm (hard), many households on Portsmouth Water notice limescale in kettles and showerheads within weeks. A shower filter is the cheapest first step; a whole-house softener gives the most complete protection. See our water softener guide for a full comparison.
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