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

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.

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

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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