If youâve recently moved to a new house, youâre probably going through the process of setting up accounts with all your different utility providers. And you may well be wondering âwho supplies my water?â
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Your water supplier is responsible for providing clean, safe drinking water to your home at a reliable pressure. In many cases they are also responsible for sewerage services, which involves taking away the waste water from your home.Â
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Hopefully the previous owner or tenant in your home has left behind details of your current utility suppliers. But if they didnât, you can quickly check who supplies your water by visiting Water.org.uk

Can IÂ switch water suppliers?
Unlike gas or electricity, UK domestic water customers do not currently have a choice of water suppliers. Business customers do have some choice, but as a domestic customer you have to use the water supplier who holds the rights to supply the area that you live in.
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This means you canât shop around for the best option, so itâs important to find out if you have hard or soft water. If you live in London, you might want to know if your tap water is safe to drink.
What is water hardness? And what are the disadvantages of hard water?
When people talk about hard water, they are referring to water that has high levels of mineral deposits. Hard water has more than 120mg of calcium carbonate per litre of water, which gives it a distinctive mineral flavour. By contrast, soft water has less than 60mg/L of calcium carbonate and a much more neutral taste.
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If you live in a hard water area, you could find that your shower gel and shampoo donât foam up well and your skin may feel dry after showering. Limescale can also build up in your kettle and washing machine, and even in your central heating system. These can eventually âfur upâ and stop working, which could end up being very expensive!
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So if you have hard water, you might want to invest in a water softener system which will improve the flavour of the water and reduce the build up of limescale.
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Who supplies my water?
Water is supplied to all homes in Scotland by Scottish Water, who are a public company.Â
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Domestic customers in Northern Ireland have their water supplied by Northern Ireland Water, who are a Government-owned company.
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And if you live in England or Wales, your water will be supplied by a private company. These private companies are shown in the colour coded map shown above. The Water UK website will also show you which company provides water in your area.Â
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As we mentioned above, you canât currently change water suppliers if you are a domestic customer. So to give you an idea of the quality and hardness of your water, our water hardness map shows the areas served by UK water suppliers together with the water hardness in the area.
How hard is my water?
To give you an indication of the water hardness in your area, weâve pulled together details of all the water companies which serve UK domestic customers.Â
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Weâve ranked the companies by water hardness so that you can easily compare water suppliers and see which companies supply hard water areas. We have also included the companyâs contact details and their rating on Trustpilot, which rates companies on the standard of their customer service. Some companies like Thames Water seem to be providing the hardest water in the UK with a Total Dissolved Solids (TDS) amount of 265. They also seem to have the worst-rated customer service with an overall rating of 1.3 stars out of 5 and close to 500 reviews. On the other hand, Scottish Water supplies the smoothest water in the country with a TDS amount of 80. The overall best water supplier in the UK is South West Water with a Trustpilot rating of 4.8 out of 5 and smooth water with a TDS amount of 100.
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It is also interesting to notice that the harder the water is in an area, the more likely will the user view their water supplier negatively. See details below. For example letâs take the 3 companies with the softest water: Scottish Water - Dwr Cymru - Northern Ireland Water. Trustpilot awards them an average of 3.8 out of 5. Now if we compare with the companies delivering the hardest water in the UK: Thames Water - Affinity Water - Severn Trent Water with an average of 2.3 out of 5. This data goes to prove that hard water affects more than just the taste of your water but your overall satisfaction towards your water supplier
Scottish Water - GreenÂ
âŠÂ          www.scottishwater.co.uk
âŠÂ          Water hardness: 80 - Very Soft
âŠÂ          UK Trustpilot score: 3.4 (2 reviews)Â

Dwr Cymru (Welsh Water) - Yellow
âŠÂ          www.dwrcymru.com
âŠÂ          Water hardness: 80 - Very soft
âŠÂ          UK Trustpilot score: 4.2 (104 reviews)

Northern Ireland Water - Orange
âŠÂ          www.niwater.com
âŠÂ          Water hardness: 100 - Soft
âŠÂ          No reviews on Trustpilot
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South West Water - Light Blue
âŠÂ          www.southwestwater.co.uk
âŠÂ          Water hardness: 100 - softÂ
âŠÂ          UK Trustpilot score: 4.8 (498 reviews)

Yorkshire Water - Pink
âŠÂ          www.yorkshirewater.com
âŠÂ          Water hardness: 100 - soft
âŠÂ          UK Trustpilot score: 2.6 (107 reviews)

Northumbrian Water - Blue
âŠÂ          www.nwl.co.uk/contact
âŠÂ          Water hardness: 130 - moderate hardness
âŠÂ          No reviews on Trustpilot
Southern Water - Dark PurpleÂ
âŠÂ          www.southernwater.co.uk
âŠÂ          Water hardness: 130 - moderate hardnessÂ
âŠÂ          UK Trustpilot score: 1.6 (109 reviews)

Anglian Water - Dark GreenÂ
âŠÂ          www.awg.com
âŠÂ          Water hardness: 180 - hard
âŠÂ          UK Trustpilot score: 3.9 (129 reviews)

Bristol Water - Purple
âŠÂ          www.bristolwater.co.uk
âŠÂ          Water hardness: 180 - hard
âŠÂ          UK Trustpilot score: 4 (3 reviews)

Portsmouth Water - Very Dark Brown
âŠÂ          www.portsmouthwater.co.uk
âŠÂ          Water hardness: 180 - hard
âŠÂ          UK Trustpilot score: 3.8 (2 reviews)

Severn Trent Water - Blue/Green
âŠÂ          www.stwater.co.uk
âŠÂ          Water hardness: 180 - hard
âŠÂ          UK Trustpilot score: 2.8 (140 reviews)

Affinity Water - Dark Brown
âŠÂ          www.affinitywater.co.uk
âŠÂ          Water hardness: 200 - hard
âŠÂ          UK Trustpilot score: 3.0 (68 reviews)
(formerly known as Veolia Water Central, Veolia Water East, Veolia Water Southeast)

Thames Water - Dark Black
âŠÂ          www.thameswater.co.uk
âŠÂ          Water hardness: 265 - very hard
âŠÂ          UK Trustpilot score: 1.3 (483 reviews)

Conclusion
Now you know which water company is supplying water to your home, and whether you have hard or soft water. If you have hard water, installing a water softener system will make your water taste better as well as reducing the risk of limescale damage. The SkĂŒma device is here to help for that! Check out how SkĂŒma transforms tap water into mineral water.