Is Northampton a hard water area?
Yes. Tap water across the NN postcode area is hard, past the point where limescale starts costing money, with a median of 225 mg/L calcium carbonate. It ranges from 166 mg/L in NN6 to 299 mg/L in NN29, from 19 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 NN district
Hardest first. Hard starts at 180 mg/L, very hard at 250.
| District | mg/L | Hardness |
|---|---|---|
| NN29 | 299 | very hard |
| NN10 | 299 | very hard |
| NN4 | 262 | very hard |
| NN3 | 250 | very hard |
| NN13 | 243 | hard |
| NN12 | 243 | hard |
| NN1 | 239 | hard |
| NN8 | 228 | hard |
| NN9 | 228 | hard |
| NN14 | 225 | hard |
| NN15 | 225 | hard |
| NN16 | 225 | hard |
| NN17 | 214 | hard |
| NN18 | 214 | hard |
| NN7 | 195 | hard |
| NN5 | 195 | hard |
| NN11 | 186 | hard |
| NN2 | 175 | moderately hard |
| NN6 | 166 | moderately hard |
Softener quotes for Northampton
At 225 mg/L most NN 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 166 and 299 mg/L.
Nearby areas
- Is Northampton a hard water area?
- Yes. The median hardness across NN postcode districts is 225 mg/L calcium carbonate, which is hard. 89% of the 19 districts we hold readings for are hard or very hard (180 mg/L and above).
- What is the water hardness in Northampton?
- Between 166 and 299 mg/L depending on the district, with a median of 225. The hardest measured district is NN29 at 299 mg/L and the softest is NN6 at 166. Figures come from water company drinking-water tests.
- Do I need a water softener in Northampton?
- In most NN homes a softener pays for itself: at 225 mg/L kettles, boilers and showers scale up quickly. Check your own district first, because hardness varies from 166 to 299 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.