Oxfordshire · South East

Is Oxford water hard or soft?

Very Hard at 304 ppm · 26 postcode districts

  • Supplier Thames Water
  • County Oxfordshire
  • Postcodes 26
Area average
304
ppm CaCO₃
Very Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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The average water hardness in Oxford is 304 ppm, classified as very hard. Oxford is served by Thames Water, covering 26 postcode districts across Oxfordshire in the South East region.

Hardness varies across the area — see the table below for a breakdown by postcode district. OX13 has the hardest water at 350 ppm, while OX14 is the softest at 250 ppm.

By postcode

Water Hardness by Postcode in Oxford

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
OX13 Thames Water
350
350 ppm Very Hard
OX12 Thames Water
349
349 ppm Very Hard
OX44 Thames Water
349
349 ppm Very Hard
OX11 Thames Water
348
348 ppm Very Hard
OX10 Thames Water
347
347 ppm Very Hard
OX9 Thames Water
335
335 ppm Very Hard
OX7 Thames Water
333
333 ppm Very Hard
OX5 Thames Water
331
331 ppm Very Hard
OX4 Thames Water
330
330 ppm Very Hard
OX3 Thames Water
329
329 ppm Very Hard
OX2 Thames Water
328
328 ppm Very Hard
OX1 Thames Water
327
327 ppm Very Hard
OX39 Thames Water
321
321 ppm Very Hard
OX33 Thames Water
315
315 ppm Very Hard
OX29 Thames Water
288
288 ppm Hard
OX28 Thames Water
287
287 ppm Hard
OX27 Thames Water
286
286 ppm Hard
OX26 Thames Water
285
285 ppm Hard
OX25 Thames Water
284
284 ppm Hard
OX20 Thames Water
279
279 ppm Hard
OX18 Thames Water
254
254 ppm Hard
OX17 Thames Water
253
253 ppm Hard
OX49 Thames Water
253
253 ppm Hard
OX16 Thames Water
252
252 ppm Hard
OX15 Thames Water
251
251 ppm Hard
OX14 Thames Water
250
250 ppm Hard
Suppliers

Water Companies Serving Oxford

Tap for full coverage area and hardness data.

Thames Water

302 ppm Very Hard

Water Hardness Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Effects Solutions Water Softeners Limescale Removal
Recommended

Products for Oxford

Popular choices for households dealing with very 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.

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Philips Shower Filter

From ~£30

Quick win for skin and hair in hard water areas. Reduces chlorine and limescale, fits standard shower hoses in minutes, no tools needed. Cartridge lasts around 6 months.

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BRITA Marella Water Filter Jug

From ~£20

UK's best-selling filter jug. Reduces limescale, chlorine, and metals for better-tasting tap water. Quick first step alongside a softener.

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FAQ

Common questions about Oxford water

Is Oxford water hard or soft?
Oxford is classified as very hard, averaging 304 ppm across 26 postcode districts. Expect visible limescale on kettles and taps within weeks at this level.
Which postcode in Oxford has the hardest water?
OX13 has the hardest water in Oxford at 350 ppm, while OX14 is the softest at 250 ppm. See the full table above for every district.
Which water company supplies Oxford?
Oxford is supplied by Thames Water, covering 26 postcode districts across Oxfordshire.
Is tap water in Oxford safe to drink?
Yes. All tap water in Oxford meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Do I need a water softener in Oxford?
At 304 ppm, many households in Oxford 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.
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