South East · County

Water hardness in Oxfordshire

Average 304 ppm across 26 postcodes and 1 towns.

  • Range 250–350 ppm
  • Towns 1
  • Suppliers Thames Water
County average
304
ppm CaCO₃
Very Hard
Soft
Moderate
Hard
Very hard
0100200300400+
304
Avg ppm
250
Min ppm
350
Max ppm
26
Postcodes

Water Hardness Across Oxfordshire

The average water hardness in Oxfordshire is 304 ppm, classified as very hard. Across 26 postcode districts in the South East region, hardness ranges from 250 ppm to 350 ppm.

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

By town

Towns in Oxfordshire

Sorted by hardness — tap a town for full details.

Town Hardness PPM Level
Oxford
304
304 ppm Very Hard
Suppliers

Water Companies in Oxfordshire

Companies supplying water to this county.

Thames Water

302 ppm Very Hard
All postcodes

Postcodes in Oxfordshire

Every postcode district in the county, sorted by hardness.

Postcode Town Hardness PPM Level
OX13 Abingdon
350
350 ppm Very Hard
OX12 Wantage
349
349 ppm Very Hard
OX44 Oxford
349
349 ppm Very Hard
OX11 Didcot
348
348 ppm Very Hard
OX10 Wallingford
347
347 ppm Very Hard
OX9 Thame
335
335 ppm Very Hard
OX7 Chipping Norton
333
333 ppm Very Hard
OX5 Kidlington
331
331 ppm Very Hard
OX4 Oxford
330
330 ppm Very Hard
OX3 Oxford
329
329 ppm Very Hard
OX2 Oxford
328
328 ppm Very Hard
OX1 Oxford
327
327 ppm Very Hard
OX39 Chinnor
321
321 ppm Very Hard
OX33 Oxford
315
315 ppm Very Hard
OX29 Witney
288
288 ppm Hard
OX28 Witney
287
287 ppm Hard
OX27 Bicester
286
286 ppm Hard
OX26 Bicester
285
285 ppm Hard
OX25 Bicester
284
284 ppm Hard
OX20 Woodstock
279
279 ppm Hard
OX18 Carterton
254
254 ppm Hard
OX17 Banbury
253
253 ppm Hard
OX49 Watlington
253
253 ppm Hard
OX16 Banbury
252
252 ppm Hard
OX15 Banbury
251
251 ppm Hard
OX14 Abingdon
250
250 ppm Hard
Recommended

Products for Oxfordshire

Top picks for households in very 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 South East · Hardest water areas · Softest water areas · Hard water solutions

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