You can't switch water supplier like you can gas and electric. So it's simply a case of finding out which water company supplies the area in which you live.
Then you can get an account set up and arrange how you'll pay your bill - that way you won't risk having your water supply cut off!
If you've just moved in, you should be able to find out either from the previous owners, tenants or landlord.
How else can you find out who supplies your water?
If you don't have the contact details of your home's previous occupier, you can still find your supplier relatively easily.
If you live in Scotland, your water will be supplied by a public company, Scottish Water.
In Northern Ireland, water and sewerage services are provided by Northern Ireland Water, a company owned by the government.
If you live in England or Wales, your water will be supplied by one of 32 private companies. You can check the Consumer Council for Water's website or the Ofwat website to find out which water company supplies your area.
If you live on the border of two water areas, then you should contact the possible water companies directly for confirmation. A full list of contact details is available on the Ofwat website.
Who deals with your waste water?
Some companies supply the water to your home and collect the wastewater from your sinks and toilets.
Others only supply you with water - in these cases you'll need to find the company that collect your waste water too.
Can you save money on your water bill?
If your new property has a water meter, it's worth taking a reading and passing it on to the supplier as soon as you can. That way you can make sure your bills are accurate and you won't end up paying for water used by the previous occupiers.
If you just want to cut your water bills, read our guide: 5 Easy Ways to Save Money on Your Water Bill.