Water hardness

SN16 Malmesbury

Near or below the UK average. Limescale builds slowly.

At 156 ppm, Malmesbury ranks near the UK's softest water areas — compare it against the hardest areas.

Moderately Hard 156 ppm South West Wessex Water
Your reading
156
parts per million
Soft
Moderate
Hard
Very hard
0100200300400+

What this means for your home

Based on 156 ppm in Malmesbury (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 156 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 Malmesbury?

A verdict and running-cost estimate based on SN16's 156 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 17.2 days
Salt running cost
£9–15
per year (~32 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 156 ppm: slight: minor descaling extends kettle/boiler life. Sized for a 4-person home; regenerates roughly every 17 days (estimate). Figures are conservative estimates and vary with household size and usage.

Water quality details

Hardness data for SN16

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

Hardness measurements

Parts per million (ppm CaCO₃)156
Degrees Clark (°Clark)10.9
Degrees French (°fH)15.6
Degrees German (°dH)8.7
Calcium (mg/L Ca²⁺)63

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 Malmesbury

SN15
Chippenham
155ppm
Moderately Hard
FAQ

Common questions about SN16

What is the water hardness in SN16 Malmesbury?
The water in SN16 Malmesbury has a hardness level of 156 ppm (parts per million) calcium carbonate, classified as moderately hard. This is 51 ppm below the UK national average of 207 ppm.
Which water company supplies SN16?
SN16 Malmesbury is supplied by Wessex Water. Wessex Water serves the South West region.
Is the water in SN16 safe to drink?
Yes. Moderately Hard water at 156 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 SN16?
At 156 ppm, the water in SN16 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 156 ppm water hardness mean?
156 ppm means there are 156 parts per million of calcium carbonate dissolved in the water. This is equivalent to 10.9 Clark degrees, 8.7 German degrees, or 15.6 French degrees. Water above 180 ppm is generally considered hard.
What size water softener do I need in SN16?
For a typical 4-person home at 156 ppm, a 24,000 grain softener is a sensible size. It would regenerate roughly every 17.2 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 SN16?
At 156 ppm, expect to use about 32 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.

Your Malmesbury water action plan

Enter your email for the short list of things worth doing at 156 ppm, and the upgrades you can safely ignore.

Check another postcode

Compare hardness across areas before moving or buying a softener.