Serving parts of North West London and the Home Counties.

Check the hardness for a dishwasher

The area we supply has, in general, ‘hard’ or ‘very hard’ water. The hardness occurs naturally and is characterised by the presence of higher levels of calcium and magnesium. These minerals are beneficial for healthy teeth and bones.

The search facility below provides general information on the hardness levels of the water supplied to more than 80,000 postcodes in our area. This information will help you set the correct setting on your dishwasher and washing machine.

This information is taken from historic results of monitoring and may be subject to change.

To use the search function please enter your complete postcode, for example, AL10 9HL.


Please read the terms and conditions of this website before using the database.