Is North West London a hard water area?
Yes. Tap water across the NW postcode area is very hard, the top band on the scale water companies use, with a median of 271 mg/L calcium carbonate. It ranges from 253 mg/L in NW9 to 281 mg/L in NW6, from 11 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 NW district
Hardest first. Hard starts at 180 mg/L, very hard at 250.
| District | mg/L | Hardness |
|---|---|---|
| NW6 | 281 | very hard |
| NW1 | 274 | very hard |
| NW2 | 273 | very hard |
| NW5 | 272 | very hard |
| NW4 | 271 | very hard |
| NW11 | 271 | very hard |
| NW3 | 268 | very hard |
| NW7 | 263 | very hard |
| NW8 | 261 | very hard |
| NW10 | 255 | very hard |
| NW9 | 253 | very hard |
Softener quotes for North West London
At 271 mg/L most NW homes get their money back on a softener within a few years. Free quotes from installers covering your postcode, no obligation.
Request a free assessment and we'll come back to you with local installer options for your area.
100%
free, no obligation
shared only with your consent
Check your exact postcode
The area figure is a median. Your district can sit anywhere between 253 and 281 mg/L.
Nearby areas
- Is North West London a hard water area?
- Yes. The median hardness across NW postcode districts is 271 mg/L calcium carbonate, which is very hard. 100% of the 11 districts we hold readings for are hard or very hard (180 mg/L and above).
- What is the water hardness in North West London?
- Between 253 and 281 mg/L depending on the district, with a median of 271. The hardest measured district is NW6 at 281 mg/L and the softest is NW9 at 253. Figures come from water company drinking-water tests.
- Do I need a water softener in North West London?
- In most NW homes a softener pays for itself: at 271 mg/L kettles, boilers and showers scale up quickly. Check your own district first, because hardness varies from 253 to 281 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.