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

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Affinity Water Water Hardness Summary

Affinity Water water is hard, averaging 268 ppm as calcium carbonate, ranging from 224 to 346 ppm across 32 postcode districts in Home Counties.

Average hardness268 ppm (Hard)
Hardness range224 to 346 ppm
ClassificationHard
Districts served32
RegionHome Counties

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.

At 268 ppm on average, Affinity 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 Affinity Water customers, and our limescale removal guide has quick fixes for kettles, taps, and boilers.

Cross-check this against Affinity Water's own data: Affinity Water water hardness report. Enter your postcode to see your water hardness level, useful for setting your dishwasher, washing machine, or water softener.

Comparison

Affinity 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%)
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.

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 Affinity Water water hardness

How do I check Affinity Water hardness by postcode?
Enter your postcode in the checker on the WaterHard.uk homepage, or find your district in the table above. Affinity Water serves 32 postcode districts across Home Counties, ranging from 224 to 346 ppm.
Is there a Affinity Water hardness checker or map?
Affinity 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 Affinity Water water in my area?
It depends on your exact postcode. Affinity Water supplies range from 224 ppm to 346 ppm, averaging 268 ppm (hard) across 32 postcode districts in Home Counties. Use the table above to find your specific district.
Do I need a water softener with Affinity Water?
At 268 ppm (hard), many households on Affinity 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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