Water hardness

CF46 Treharris

Near or below the UK average. Limescale builds slowly.

At 38 ppm, Treharris ranks near the UK's softest water areas — compare it against the hardest areas.

Soft 38 ppm Wales Welsh Water (Dwr Cymru)
Your reading
38
parts per million
Soft
Moderate
Hard
Very hard
0100200300400+

What this means for your home

Based on 38 ppm in Treharris (soft water).

  • Soap lathers easily with less product needed
  • Minimal limescale buildup in appliances
  • Gentle on skin and hair
  • May taste slightly flat compared to harder water
Heat loss
1%
Minimal scaling
Softener salt
£2–4
per year
Worth it?
No
at 38 ppm
Suggested for soft 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 Treharris?

A verdict and running-cost estimate based on CF46's 38 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 70.5 days
Salt running cost
£2–4
per year (~8 kg salt)
Limescale
1%
est. heater efficiency loss. Minimal scaling
Soap saving
Minimal
Water is already soft, so there is little detergent saving from softening.

Appliance impact at 38 ppm: negligible: appliances reach full expected life. Sized for a 4-person home; regenerates roughly every 70 days (estimate). Figures are conservative estimates and vary with household size and usage.

Water quality details

Hardness data for CF46

Sourced from Welsh Water (Dwr Cymru)'s published water-quality reports and public records.

Hardness measurements

Parts per million (ppm CaCO₃)38
Degrees Clark (°Clark)2.7
Degrees French (°fH)3.8
Degrees German (°dH)2.1
Calcium (mg/L Ca²⁺)15

Supplier and area

Water supplier Welsh Water (Dwr Cymru)
Region Wales
County Cardiff
Hardness band Soft
UK average 207 ppm
Visit Welsh Water (Dwr Cymru) page
Official source
Dwr Cymru Welsh Water water-hardness report

Read the hardness explanation here, then enter your postcode on the linked drinking water quality checker to see your area's calcium and magnesium levels.

Nearby

Other areas near Treharris

CF45
Mountain Ash
37ppm
Soft
CF47
Merthyr Tydfil
39ppm
Soft
CF48
Merthyr Tydfil
40ppm
Soft
FAQ

Common questions about CF46

What is the water hardness in CF46 Treharris?
The water in CF46 Treharris has a hardness level of 38 ppm (parts per million) calcium carbonate, classified as soft. This is 169 ppm below the UK national average of 207 ppm.
Which water company supplies CF46?
CF46 Treharris is supplied by Welsh Water (Dwr Cymru). Welsh Water (Dwr Cymru) serves the Wales region.
Is the water in CF46 safe to drink?
Yes. Soft water at 38 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 CF46?
At 38 ppm, the water in CF46 is soft and unlikely to cause significant issues. A jug filter can improve taste, but a water softener is generally not necessary.
What does 38 ppm water hardness mean?
38 ppm means there are 38 parts per million of calcium carbonate dissolved in the water. This is equivalent to 2.7 Clark degrees, 2.1 German degrees, or 3.8 French degrees. Water above 180 ppm is generally considered hard.
What size water softener do I need in CF46?
For a typical 4-person home at 38 ppm, a 24,000 grain softener is a sensible size. It would regenerate roughly every 70.5 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 CF46?
At 38 ppm, expect to use about 8 kg of salt a year, costing roughly £2–£4/year. Water is soft to moderate, so limescale and soap costs are low and a softener rarely pays back.

Check another postcode

Compare hardness across areas before moving or buying a softener.