289mg of limescale minerals in every litre, the median across SN districts
Is Swindon a hard water area?
Yes. Tap water across the SN postcode area is very hard, the top band on the scale water companies use, with a median of 289 mg/L calcium carbonate. It ranges from 233 mg/L in SN26 to 330 mg/L in SN5, from 18 districts with their own water company reading.
- 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 SN district
Hardest first. Hard starts at 180 mg/L, very hard at 250.
| District | Area | mg/L | Hardness |
|---|---|---|---|
| SN5 | Swindon | 330 | very hard |
| SN6 | Swindon | 316 | very hard |
| SN3 | Swindon | 315 | very hard |
| SN11 | Wiltshire | 313 | very hard |
| SN14 | Wiltshire | 300 | very hard |
| SN15 | Wiltshire | 295 | very hard |
| SN8 | Swindon | 295 | very hard |
| SN7 | Vale of White Horse | 289 | very hard |
| SN12 | Wiltshire | 289 | very hard |
| SN13 | Wiltshire | 289 | very hard |
| SN10 | Wiltshire | 288 | very hard |
| SN2 | Swindon | 276 | very hard |
| SN4 | Wiltshire | 274 | very hard |
| SN25 | Swindon | 272 | very hard |
| SN16 | Wiltshire | 269 | very hard |
| SN1 | Swindon | 268 | very hard |
| SN9 | Wiltshire | 235 | hard |
| SN26 | Swindon | 233 | hard |
What to do about it
Hard water: compare softener quotes
At 289 mg/L most SN homes get their money back on a softener within a few years. A filter will not touch limescale; only a softener does.
- Free quotes
- Local installers
- No obligation
Check your own district first
The area figure is a median. Your district can sit anywhere between 233 and 330 mg/L.
Softener quotes for Swindon
At 289 mg/L most SN homes get their money back on a softener within a few years. Free quotes from installers covering your postcode.
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Before you buy
- Do I need a water softener?The hardness bands, the symptoms, and when the answer is no
- Best water softener UKHarvey, Kinetico, BWT, Monarch and Water2Buy compared
- Water softener costUnit, fitting and salt, and how long the payback takes
- Installation explainedWhere it goes, the bypass tap, the drain, DIY or plumber
- Harvey vs KineticoThe two premium twin-cylinder brands, side by side
- Softener salt guideTablet, block or granular, and how much you get through
- Salt-free softenersConditioners and electronic descalers, honestly assessed
Questions about Swindon water
Is Swindon a hard water area?
Yes. The median hardness across SN postcode districts is 289 mg/L calcium carbonate, which is very hard. 100% of the 18 districts we hold readings for are hard or very hard (180 mg/L and above).
What is the water hardness in Swindon?
Between 233 and 330 mg/L depending on the district, with a median of 289. The hardest measured district is SN5 at 330 mg/L and the softest is SN26 at 233. Figures come from water company drinking-water tests.
Do I need a water softener in Swindon?
In most SN homes a softener pays for itself: at 289 mg/L kettles, boilers and showers scale up quickly. Check your own district first, because hardness varies from 233 to 330 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.