WaterHard.uk

Water Hardness in SW3 London

Supplied by Thames Water • Greater London, London

0 200 400 309 ppm
Very Hard
309
ppm (mg/L CaCO₃)
21.6°
Clark Degrees
17.3°
German Degrees (dH)
30.9°
French Degrees (fH)

Water Hardness in London (SW3)

The water in postcode district SW3 is classified as very hard with a hardness level of 309 ppm (parts per million) calcium carbonate. This is 104 ppm above the UK national average of 205 ppm.

Your water is supplied by Thames Water, which serves the London region. Thames Water draws water from sources that naturally contain dissolved minerals, primarily calcium and magnesium compounds.

What Does Very Hard Water Mean for Your Home?

  • ! Heavy limescale requiring frequent descaling
  • ! Blocked showerheads and reduced water flow
  • ! Substantially higher energy bills from boiler scale
  • ! Dry, itchy skin and lifeless hair
  • ! White crusty deposits on taps and surfaces
  • ! Reduced lifespan of washing machines and dishwashers

Solutions for Hard Water in London

At 309 ppm, you may benefit from a water softener or filter to reduce limescale and improve water quality.

View Solutions Water Softener Guide

How SW3 Compares

Area Hardness PPM
SW3 London
309 ppm
309 ppm
UK National Average
205 ppm
205 ppm

Nearby Areas

SW2
London
308 ppm
SW4
London
310 ppm
SW5
London
311 ppm

Frequently Asked Questions

What is the water hardness in SW3 London?
The water in SW3 London has a hardness level of 309 ppm (parts per million) calcium carbonate, classified as very hard. This is 104 ppm above the UK national average of 205 ppm.
Which water company supplies SW3?
SW3 London is supplied by Thames Water. Thames Water serves the London region.
Is the water in SW3 safe to drink?
Yes. Very Hard water at 309 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 SW3?
For very hard water at 309 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 309 ppm water hardness mean?
309 ppm means there are 309 parts per million of calcium carbonate dissolved in the water. This is equivalent to 21.6 Clark degrees, 17.3 German degrees, or 30.9 French degrees. Water above 180 ppm is generally considered hard.

All postcodes in London • Thames Water coverage • Hardest water areas • Softest water areas

Get updates for SW3

We'll notify you when Thames Water reports changes to water hardness in your area.