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

Postcodes

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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.

Hardness across Northamptonshire ranges from 255 ppm to 298 ppm by postcode district. The county spans 1 towns and 19 postcode districts in total.

At 278 ppm, Northamptonshire ranks as hard water nationally. Compare it against the 50 hardest water areas in the UK.

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.

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

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.

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FAQ

Water Hardness in Northamptonshire: Common Questions

Is the water in Northamptonshire hard or soft?

Northamptonshire has hard water, averaging 278 ppm across 19 postcode districts. Expect visible limescale on kettles, taps and shower screens within weeks at this level.

Where is the hardest water in Northamptonshire?

Across Northamptonshire, water hardness ranges from 255 ppm to 298 ppm by postcode district.

Which water company supplies Northamptonshire?

Northamptonshire is supplied by Anglian Water. You can check each supplier's reported hardness figures on their water company page.

Do I need a water softener in Northamptonshire?

At 278 ppm, Northamptonshire is in the hard band where a water softener noticeably reduces limescale and helps protect boilers and appliances. See the water softener guide for the payback maths.

What is the average water hardness in Northamptonshire?

The average water hardness in Northamptonshire is 278 ppm (parts per million), classified as hard. It ranges from 255 ppm to 298 ppm across 19 postcode districts in the East Midlands region.

Hard Water Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Hard Water Effects Solutions Water Softener Guide

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