Water hardness

SN5 Swindon

Harder than the UK average. Expect visible limescale on kettles and taps.

At 203 ppm, Swindon sits among the UK's hardest water areas — compare it against the softest areas.

Hard 203 ppm South West Wessex Water
Your reading
203
parts per million
Soft
Moderate
Hard
Very hard
0100200300400+

What this means for your home

Based on 203 ppm in Swindon (hard water).

  • Significant limescale buildup in kettles, pipes and boilers
  • Soap scum on shower screens and taps
  • Higher energy bills from scale in heating elements
  • Dry skin and dull hair after washing
  • White residue on dishes and glassware
Heat loss
8%
Moderate scaling
Softener salt
£12–20
per year
Worth it?
Yes
at 203 ppm
Suggested for hard water
Whole-house water softener
Best long-term protection for boilers and pipes.
From £600 installed
Shower head filter
A simple first step for limescale on tiles and glass.
From £25
Filter jug or under-sink
Improves taste and reduces kettle scale.
From £20
Softening

Should you soften the water in Swindon?

A verdict and running-cost estimate based on SN5's 203 ppm reading, for a typical 4-person household.

Softener recommended

Hardness is moderate to hard, so a softener cuts scale and soap use and usually pays back over its lifetime.

Recommended size
24k
grain capacity, regenerates ~every 13.2 days
Salt running cost
£12–20
per year (~41 kg salt)
Limescale
8%
est. heater efficiency loss. Moderate scaling
Soap saving
Moderate
Noticeable saving: soaps lather more easily, cutting detergent use.

Appliance impact at 203 ppm: noticeable: boiler/dishwasher life cut without descaling. Sized for a 4-person home; regenerates roughly every 13 days (estimate). Figures are conservative estimates and vary with household size and usage.

Water quality details

Hardness data for SN5

Sourced from Wessex Water's published water-quality reports and public records.

Hardness measurements

Parts per million (ppm CaCO₃)203
Degrees Clark (°Clark)14.2
Degrees French (°fH)20.3
Degrees German (°dH)11.4
Calcium (mg/L Ca²⁺)81

Supplier and area

Water supplier Wessex Water
Region South West
County Wiltshire
Hardness band Hard
UK average 207 ppm
Visit Wessex Water page
Official source
Wessex Water water-hardness report

Read the hardness and limescale guidance here, then use the postcode checker to see your local hardness value.

Nearby

Other areas near Swindon

SN4
Swindon
202ppm
Hard
SN6
Swindon
204ppm
Hard
SN7
Faringdon
205ppm
Hard
FAQ

Common questions about SN5

What is the water hardness in SN5 Swindon?
The water in SN5 Swindon has a hardness level of 203 ppm (parts per million) calcium carbonate, classified as hard. This is 4 ppm below the UK national average of 207 ppm.
Which water company supplies SN5?
SN5 Swindon is supplied by Wessex Water. Wessex Water serves the South West region.
Is the water in SN5 safe to drink?
Yes. Hard water at 203 ppm is safe to drink. Water hardness affects taste and can cause limescale, but it is not a health risk. In fact, hard water contains beneficial minerals like calcium and magnesium.
How can I reduce water hardness in SN5?
For hard water at 203 ppm, a whole-house water softener is the most effective solution. You can also use a jug filter for drinking water, descaling products for appliances, and a shower filter for better skin and hair.
What does 203 ppm water hardness mean?
203 ppm means there are 203 parts per million of calcium carbonate dissolved in the water. This is equivalent to 14.2 Clark degrees, 11.4 German degrees, or 20.3 French degrees. Water above 180 ppm is generally considered hard.
What size water softener do I need in SN5?
For a typical 4-person home at 203 ppm, a 24,000 grain softener is a sensible size. It would regenerate roughly every 13.2 days. Larger households or higher daily use need a bigger unit. These figures are conservative estimates.
How much does it cost to run a water softener in SN5?
At 203 ppm, expect to use about 41 kg of salt a year, costing roughly £12–£20/year. Hardness is moderate to hard, so a softener cuts scale and soap use and usually pays back over its lifetime.

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