Water hardness

DL10 Richmond

Near or below the UK average. Limescale builds slowly.

At 115 ppm, Richmond ranks near the UK's softest water areas — compare it against the hardest areas.

Slightly Hard 115 ppm North East Northumbrian Water
Your reading
115
parts per million
Soft
Moderate
Hard
Very hard
0100200300400+

What this means for your home

Based on 115 ppm in Richmond (slightly hard water).

  • Minor limescale may appear in kettles over time
  • Soap lathers reasonably well
  • Appliances generally unaffected
  • Good balance of mineral taste
Heat loss
4%
Light scaling
Softener salt
£7–11
per year
Worth it?
No
at 115 ppm
Suggested for slightly 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 Richmond?

A verdict and running-cost estimate based on DL10's 115 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 23.3 days
Salt running cost
£7–11
per year (~23 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 115 ppm: slight: minor descaling extends kettle/boiler life. Sized for a 4-person home; regenerates roughly every 23 days (estimate). Figures are conservative estimates and vary with household size and usage.

Water quality details

Hardness data for DL10

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

Hardness measurements

Parts per million (ppm CaCO₃)115
Degrees Clark (°Clark)8
Degrees French (°fH)11.5
Degrees German (°dH)6.4
Calcium (mg/L Ca²⁺)46

Supplier and area

Water supplier Northumbrian Water
Region North East
County County Durham
Hardness band Slightly Hard
UK average 207 ppm
Visit Northumbrian Water page
Official source
Northumbrian Water water-hardness report

This page explains local hardness and links to a postcode water quality checker so you can find your supply zone's level.

Nearby

Other areas near Richmond

DL9
Catterick Garrison
82ppm
Slightly Hard
DL11
Richmond
116ppm
Slightly Hard
DL12
Barnard Castle
117ppm
Slightly Hard
FAQ

Common questions about DL10

What is the water hardness in DL10 Richmond?
The water in DL10 Richmond has a hardness level of 115 ppm (parts per million) calcium carbonate, classified as slightly hard. This is 92 ppm below the UK national average of 207 ppm.
Which water company supplies DL10?
DL10 Richmond is supplied by Northumbrian Water. Northumbrian Water serves the North East region.
Is the water in DL10 safe to drink?
Yes. Slightly Hard water at 115 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 DL10?
At 115 ppm, the water in DL10 is slightly hard and unlikely to cause significant issues. A jug filter can improve taste, but a water softener is generally not necessary.
What does 115 ppm water hardness mean?
115 ppm means there are 115 parts per million of calcium carbonate dissolved in the water. This is equivalent to 8 Clark degrees, 6.4 German degrees, or 11.5 French degrees. Water above 180 ppm is generally considered hard.
What size water softener do I need in DL10?
For a typical 4-person home at 115 ppm, a 24,000 grain softener is a sensible size. It would regenerate roughly every 23.3 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 DL10?
At 115 ppm, expect to use about 23 kg of salt a year, costing roughly £7–£11/year. Water is soft to moderate, so limescale and soap costs are low and a softener rarely pays back.

Your Richmond water action plan

Enter your email for the short list of things worth doing at 115 ppm, and the upgrades you can safely ignore.

Check another postcode

Compare hardness across areas before moving or buying a softener.