Is Sutton a hard water area?
Yes. Tap water across the SM postcode area is very hard, the top band on the scale water companies use, with a median of 257 mg/L calcium carbonate. It ranges from 254 mg/L in SM7 to 318 mg/L in SM6, from 7 districts with their own water company reading.
- Soft
- Moderately soft
- Slightly hard
- Very hard
- Soft
- 0 to 60 mg/L
- Moderately soft
- 60 to 120 mg/L
- Slightly hard
- 120 to 180 mg/L
- Hard
- 180 to 200 mg/L
- Very hard
- 200 to 400 mg/L
Hardness by SM district
Hardest first. Hard starts at 180 mg/L, very hard at 250.
| District | mg/L | Hardness |
|---|---|---|
| SM6 | 318 | very hard |
| SM5 | 313 | very hard |
| SM3 | 261 | very hard |
| SM4 | 257 | very hard |
| SM2 | 256 | very hard |
| SM1 | 255 | very hard |
| SM7 | 254 | very hard |
Softener quotes for Sutton
At 257 mg/L most SM homes get their money back on a softener within a few years. Free quotes from installers covering your postcode, no obligation.
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Check your exact postcode
The area figure is a median. Your district can sit anywhere between 254 and 318 mg/L.
Nearby areas
- Croydon 259
- Kingston upon Thames 225
- South West London 258
- South East London 294
- West London 266
- Bromley 293
- Is Sutton a hard water area?
- Yes. The median hardness across SM postcode districts is 257 mg/L calcium carbonate, which is very hard. 100% of the 7 districts we hold readings for are hard or very hard (180 mg/L and above).
- What is the water hardness in Sutton?
- Between 254 and 318 mg/L depending on the district, with a median of 257. The hardest measured district is SM6 at 318 mg/L and the softest is SM7 at 254. Figures come from water company drinking-water tests.
- Do I need a water softener in Sutton?
- In most SM homes a softener pays for itself: at 257 mg/L kettles, boilers and showers scale up quickly. Check your own district first, because hardness varies from 254 to 318 within the area.
Hardness as mg/L calcium carbonate from water company drinking-water tests and postcode checkers. See the UK hardness map for every area.