Home Counties · Water company

Affinity Water Hardness

Average 268 ppm across 32 postcodes served.

  • Range 224–346 ppm
  • Region Home Counties
  • Postcodes 32
Company average
268
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+
268
Avg ppm
224
Min ppm
346
Max ppm
32
Postcodes

About Affinity Water

Affinity Water is the largest water-only company in the UK, serving 3.6 million customers across the Home Counties north of London. Chalk aquifer sources produce consistently hard water.

Distribution

Hardness Breakdown

0
Soft
(0%)
0
Slightly Hard
(0%)
0
Moderate
(0%)
23
Hard
(72%)
9
Very Hard
(28%)
All areas

Areas Served by Affinity Water

Every postcode district, sorted by hardness.

Postcode Town Hardness PPM Level
EN9 Waltham Abbey
346
346 ppm Very Hard
EN8 Waltham Cross
345
345 ppm Very Hard
EN7 Waltham Cross
344
344 ppm Very Hard
EN6 Potters Bar
343
343 ppm Very Hard
EN5 Barnet
342
342 ppm Very Hard
EN4 Barnet
341
341 ppm Very Hard
EN3 Enfield
340
340 ppm Very Hard
EN2 Enfield
339
339 ppm Very Hard
EN1 Enfield
338
338 ppm Very Hard
WD25 Watford
255
255 ppm Hard
AL10 Hatfield
254
254 ppm Hard
WD24 Watford
254
254 ppm Hard
WD23 Bushey
253
253 ppm Hard
AL9 Hatfield
247
247 ppm Hard
EN11 Hoddesdon
247
247 ppm Hard
AL8 Welwyn Garden City
246
246 ppm Hard
EN10 Broxbourne
246
246 ppm Hard
AL7 Welwyn Garden City
245
245 ppm Hard
AL6 Welwyn
244
244 ppm Hard
AL5 Harpenden
243
243 ppm Hard
AL4 St Albans
242
242 ppm Hard
AL3 St Albans
241
241 ppm Hard
AL2 St Albans
240
240 ppm Hard
AL1 St Albans
239
239 ppm Hard
WD7 Radlett
228
228 ppm Hard
WD6 Borehamwood
227
227 ppm Hard
WD19 Watford
226
226 ppm Hard
WD5 Abbots Langley
226
226 ppm Hard
WD18 Watford
225
225 ppm Hard
WD4 Kings Langley
225
225 ppm Hard
WD17 Watford
224
224 ppm Hard
WD3 Rickmansworth
224
224 ppm Hard
Recommended

Products for Affinity 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

Enter your email and we will send the fixes that actually work for your hardness level, plus what to skip.