Greater London · London

Is Sutton water hard or soft?

Hard at 239 ppm · 7 postcode districts

  • Supplier SES Water
  • County Greater London
  • Postcodes 7
Area average
239
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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The average water hardness in Sutton is 239 ppm, classified as hard. Sutton is served by SES Water, covering 7 postcode districts across Greater London in the London region.

Hardness varies across the area — see the table below for a breakdown by postcode district. SM7 has the hardest water at 242 ppm, while SM1 is the softest at 236 ppm.

By postcode

Water Hardness by Postcode in Sutton

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
SM7 SES Water
242
242 ppm Hard
SM6 SES Water
241
241 ppm Hard
SM5 SES Water
240
240 ppm Hard
SM4 SES Water
239
239 ppm Hard
SM3 SES Water
238
238 ppm Hard
SM2 SES Water
237
237 ppm Hard
SM1 SES Water
236
236 ppm Hard
Suppliers

Water Companies Serving Sutton

Tap for full coverage area and hardness data.

SES Water

239 ppm 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 Sutton

Popular choices for households dealing with 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 Sutton water

Is Sutton water hard or soft?
Sutton is classified as hard, averaging 239 ppm across 7 postcode districts. Expect visible limescale on kettles and taps within weeks at this level.
Which postcode in Sutton has the hardest water?
SM7 has the hardest water in Sutton at 242 ppm, while SM1 is the softest at 236 ppm. See the full table above for every district.
Which water company supplies Sutton?
Sutton is supplied by SES Water, covering 7 postcode districts across Greater London.
Is tap water in Sutton safe to drink?
Yes. All tap water in Sutton meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Do I need a water softener in Sutton?
At 239 ppm, many households in Sutton 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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