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+

Sutton water hardness at a glance

  1. Sutton water is hard, averaging 239 ppm across 7 postcode districts.
  2. That is 32 ppm above the UK average of 207 ppm.
  3. The hardest district is SM7 at 242 ppm; the softest is SM1 at 236 ppm.
  4. The supplier is SES Water.
  5. Expect limescale on kettles, taps and showerheads; see the water softener guide for sizing and costs.

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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

Each water company publishes its own hardness data, so you can cross-check the Sutton figures here against the published hardness data from SES Water.

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

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

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

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?
Hardness is not a safety issue: the World Health Organization sets no health-based limit for water hardness, so hard and soft water are both fine to drink. Drinking water quality is regulated by the Drinking Water Inspectorate in England and Wales and the Drinking Water Quality Regulator in Scotland, and your water company publishes test results for your area.
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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