SES Water Water Hardness — Average 239 ppm

About SES Water

SES Water (Sutton and East Surrey Water) supplies drinking water to 735,000 people in parts of Surrey, Kent and south London. Chalk boreholes produce hard water.

At 239 ppm on average, SES Water ranks as hard water. See how it compares across the UK in our 50 hardest water areas ranking.

All areas

Areas Served by SES Water

Every postcode district, sorted by hardness.

Postcode	Town	Hardness	PPM	Level
SM7	Banstead	242	242 ppm	Hard
SM6	Wallington	241	241 ppm	Hard
SM5	Carshalton	240	240 ppm	Hard
SM4	Morden	239	239 ppm	Hard
SM3	Sutton	238	238 ppm	Hard
SM2	Sutton	237	237 ppm	Hard
SM1	Sutton	236	236 ppm	Hard

Recommended

Products for SES Water Customers

Popular choices for households on 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

A quick, affordable upgrade. Reduces chlorine and limescale at the showerhead, fits any standard UK shower hose in minutes. Protects skin and hair from hard water damage.

View on Amazon

FAQ

Common questions about SES Water water hardness

How do I check SES Water hardness by postcode?

Enter your postcode in the checker on the WaterHard.uk homepage, or find your district in the table above. SES Water serves 7 postcode districts across Surrey & South London, ranging from 236 to 242 ppm.

Is there a SES Water hardness checker or map?

SES Water publishes water quality data by postcode, but it can be scattered across PDF reports. WaterHard.uk compiles it into the searchable table above so you can find your district's reading in one place.

How hard is SES Water water in my area?

It depends on your exact postcode. SES Water supplies range from 236 ppm to 242 ppm, averaging 239 ppm (hard) across 7 postcode districts in Surrey & South London. Use the table above to find your specific district.

Do I need a water softener with SES Water?

At 239 ppm (hard), many households on SES Water 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. See our water softener guide for a full comparison.

Get free water softener quotes

Tell us about your home and we will match you with quotes for softening your hard water. No obligation, takes under a minute.

SES Water Hardness