WaterWater Hardness in South East
352 postcode districts • 8 counties
Water Hardness Across South East
The average water hardness in the South East region is 274 ppm, classified as hard. Across 352 postcode districts, hardness ranges from 163 ppm to 350 ppm.
The region is served by Affinity Water, Anglian Water, Portsmouth Water, Severn Trent Water, Southern Water, Thames Water. Water hardness varies by county — see the breakdown below or check your specific postcode.
Counties in South East
| County | Avg Hardness | PPM | Level | Postcodes |
|---|---|---|---|---|
| Surrey | 305 ppm | Very Hard | 58 | |
| Oxfordshire | 304 ppm | Very Hard | 26 | |
| Hertfordshire | 303 ppm | Very Hard | 53 | |
| Buckinghamshire | 301 ppm | Very Hard | 26 | |
| Berkshire | 291 ppm | Hard | 40 | |
| East Sussex | 271 ppm | Hard | 30 | |
| Kent | 246 ppm | Hard | 81 | |
| Hampshire | 244 ppm | Hard | 57 |
Water Companies in South East
Hard Water Guides
Learn more about water hardness and how to manage it.
Recommended Products for South East
Top picks for households in hard water areas across South East.
Water2Buy W2B200 Water Softener
From ~£400Best-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 AmazonPhilips AWP1775 Shower Filter
From ~£30Instant 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 AmazonGet Water Hardness Updates
Be notified when your water company reports changes to hardness levels.