Water hardness

SN10 Devizes

Near or below the UK average. Limescale builds slowly.

At 150 ppm, Devizes ranks near the UK's softest water areas — compare it against the hardest areas.

Moderately Hard 150 ppm South West Wessex Water
Your reading
150
parts per million
Soft
Moderate
Hard
Very hard
0100200300400+

What this means for your home

Based on 150 ppm in Devizes (moderately hard water).

  • Noticeable limescale buildup in kettles and boilers
  • Soap may not lather as easily
  • Showerhead may need descaling periodically
  • Slight film on glassware after washing
Heat loss
4%
Light scaling
Softener salt
£9–15
per year
Worth it?
No
at 150 ppm
Suggested for moderately hard water
Filter jug (optional)
Mainly a taste preference, limescale won't be a real issue here.
From £20
Maintenance habits
Routine descaling once or twice a year is plenty.
Free
Softening

Should you soften the water in Devizes?

A verdict and running-cost estimate based on SN10's 150 ppm reading, for a typical 4-person household.

Softener optional

Water is soft to moderate, so limescale and soap costs are low and a softener rarely pays back.

Recommended size
24k
grain capacity, regenerates ~every 17.9 days
Salt running cost
£9–15
per year (~31 kg salt)
Limescale
4%
est. heater efficiency loss. Light scaling
Soap saving
Low
Some saving: expect to use slightly less soap and detergent.

Appliance impact at 150 ppm: slight: minor descaling extends kettle/boiler life. Sized for a 4-person home; regenerates roughly every 18 days (estimate). Figures are conservative estimates and vary with household size and usage.

Test Your Water in Devizes

At 150 ppm, your water is moderately hard. A home testing kit lets you verify the exact hardness and check for other contaminants.

TESPERT 16-in-1 Water Testing Kit

From ~£10

Home water test strips that check hardness, pH, chlorine, lead, and 12 other parameters. Results in around 60 seconds. 125 strips per pack.

View on Amazon
Water quality details

Hardness data for SN10

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

Hardness measurements

Parts per million (ppm CaCO₃)150
Degrees Clark (°Clark)10.5
Degrees French (°fH)15
Degrees German (°dH)8.4
Calcium (mg/L Ca²⁺)60

Supplier and area

Water supplier Wessex Water
Region South West
County Wiltshire
Hardness band Moderately 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 Devizes

SN9
Pewsey
207ppm
Hard
SN11
Calne
151ppm
Moderately Hard
SN12
Melksham
152ppm
Moderately Hard
FAQ

Common questions about SN10

What is the water hardness in SN10 Devizes?
The water in SN10 Devizes has a hardness level of 150 ppm (parts per million) calcium carbonate, classified as moderately hard. This is 57 ppm below the UK national average of 207 ppm.
Which water company supplies SN10?
SN10 Devizes is supplied by Wessex Water. Wessex Water serves the South West region.
Is the water in SN10 safe to drink?
Yes. Moderately Hard water at 150 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 SN10?
At 150 ppm, the water in SN10 is moderately hard and unlikely to cause significant issues. A jug filter can improve taste, but a water softener is generally not necessary.
What does 150 ppm water hardness mean?
150 ppm means there are 150 parts per million of calcium carbonate dissolved in the water. This is equivalent to 10.5 Clark degrees, 8.4 German degrees, or 15 French degrees. Water above 180 ppm is generally considered hard.
What size water softener do I need in SN10?
For a typical 4-person home at 150 ppm, a 24,000 grain softener is a sensible size. It would regenerate roughly every 17.9 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 SN10?
At 150 ppm, expect to use about 31 kg of salt a year, costing roughly £9–£15/year. Water is soft to moderate, so limescale and soap costs are low and a softener rarely pays back.

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