East Midlands · County

Water hardness in Northamptonshire

Average 278 ppm across 19 postcodes and 1 towns.

  • Range 255–298 ppm
  • Towns 1
  • Suppliers Anglian Water
County average
278
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+
278
Avg ppm
255
Min ppm
298
Max ppm
19
Postcodes

Water Hardness Across Northamptonshire

The average water hardness in Northamptonshire is 278 ppm, classified as hard. Across 19 postcode districts in the East Midlands region, hardness ranges from 255 ppm to 298 ppm.

Northamptonshire is served by Anglian Water. With hard water, residents may benefit from a water softener to reduce limescale and protect appliances.

By town

Towns in Northamptonshire

Sorted by hardness — tap a town for full details.

Town Hardness PPM Level
Northampton
278
278 ppm Hard
Suppliers

Water Companies in Northamptonshire

Companies supplying water to this county.

Anglian Water

321 ppm Very Hard
All postcodes

Postcodes in Northamptonshire

Every postcode district in the county, sorted by hardness.

Postcode Town Hardness PPM Level
NN9 Wellingborough
298
298 ppm Hard
NN29 Wellingborough
297
297 ppm Hard
NN8 Wellingborough
297
297 ppm Hard
NN7 Northampton
296
296 ppm Hard
NN6 Northampton
295
295 ppm Hard
NN5 Northampton
294
294 ppm Hard
NN4 Northampton
293
293 ppm Hard
NN3 Northampton
292
292 ppm Hard
NN2 Northampton
291
291 ppm Hard
NN1 Northampton
290
290 ppm Hard
NN18 Corby
263
263 ppm Hard
NN17 Corby
262
262 ppm Hard
NN16 Kettering
261
261 ppm Hard
NN15 Kettering
260
260 ppm Hard
NN14 Kettering
259
259 ppm Hard
NN13 Brackley
258
258 ppm Hard
NN12 Towcester
257
257 ppm Hard
NN11 Daventry
256
256 ppm Hard
NN10 Rushden
255
255 ppm Hard
Recommended

Products for Northamptonshire

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 East Midlands · Hardest water areas · Softest water areas · Hard water solutions

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