💧 Free postcode checker

Who supplies my water?

Enter your postcode to find your water supplier, checked against the official Ofwat water company boundaries for England and Wales, plus your likely sewerage company. Scotland and Northern Ireland are covered too.

Use a full postcode for the most accurate result. Your postcode is only used to look up its location and is not stored.

How the checker works

The checker finds the centre point of your postcode using postcodes.io (open Ordnance Survey and ONS data). It then checks which water company supply area that point falls inside, using the water company boundaries published by Ofwat and shared through the water industry's Stream open data platform. That gives the supplier for your area, including the small new appointees (NAVs) that serve some new developments.

Supply boundaries can run between neighbouring streets, and a postcode covers several addresses. So if you live close to a boundary, your bill is the final word. Sewerage areas aren't published in a form the checker can use, so the sewerage company is shown as likely wherever it can differ from your water supplier.

Water and sewerage companies across the UK

Each company profile covers its region, its AMP8 investment plans and the tenders and frameworks it's running.

Affinity WaterWater only · Central, East (Tendring) and Southeast (Folkestone) Anglian WaterWater and sewerage · East of England Bournemouth WaterWater only · part of South West Water Bristol WaterWater only · part of South West Water Cambridge WaterWater only · part of South Staffs Water Dŵr Cymru Welsh WaterWater and sewerage · most of Wales Essex & Suffolk WaterWater only · part of Northumbrian Water Hafren DyfrdwyWater and sewerage · Wrexham and mid Wales Hartlepool WaterWater only · part of Anglian Water Northumbrian WaterWater and sewerage · North East England NI WaterWater and sewerage · Northern Ireland Portsmouth WaterWater only · south-east Hampshire and West Sussex Scottish WaterWater and sewerage · Scotland SES WaterWater only · Sutton and East Surrey Severn Trent WaterWater and sewerage · Midlands South East WaterWater only · Kent, Sussex, Surrey, Hampshire, Berkshire South Staffs WaterWater only · Staffordshire, West Midlands South West WaterWater and sewerage · Devon and Cornwall Southern WaterWater and sewerage · Kent, Sussex, Hampshire, Isle of Wight Thames WaterWater and sewerage · London and Thames Valley United UtilitiesWater and sewerage · North West England Wessex WaterWater and sewerage · Somerset, Dorset, Wiltshire Yorkshire WaterWater and sewerage · Yorkshire Icosa WaterNew appointee (NAV) · new developments

Frequently asked questions

How do I find out who supplies my water?

Enter your postcode in the checker above. It matches the location of your postcode against the official water company supply boundaries published by Ofwat. Your water bill will also name your supplier.

Is my water company the same as my sewerage company?

Not always. In England and Wales, ten regional companies provide both water and sewerage. In areas served by a water-only company, such as Affinity Water, SES Water, South East Water, Portsmouth Water, South Staffs Water or Bristol Water, sewerage is provided by a different regional company. Your bill shows both.

Can I choose or switch my water supplier?

Households in England and Wales can't switch their water supplier. Businesses, charities and public sector organisations in England (and in Scotland) can choose their water retailer, although the network itself is still run by the regional water company. How the business water retail market works →

What is a new appointee (NAV) water company?

Some new housing and commercial developments are served by a new appointee, also known as a NAV, such as Independent Water Networks or Icosa Water, instead of the regional company. If your postcode falls inside one of these areas, the checker shows it.

Is there a hosepipe ban in my area?

Look up your supplier above, then check the UK hosepipe ban tracker for its current status.

Who supplies water in Scotland and Northern Ireland?

Scottish Water provides water and sewerage services across Scotland, and NI Water provides them across Northern Ireland.

Work in the water sector?

Water Industry Hub tracks tenders, frameworks and contract awards across all 28 UK and Ireland water companies, alongside a directory of 8,054+ sector suppliers.

See live water tenders → Browse the supplier directory

Water supply boundaries: Water Company Boundaries, based on geographical boundary data from Ofwat, published by Stream (streamwaterdata.co.uk) under CC BY 4.0. Postcode locations: postcodes.io, which contains Ordnance Survey data © Crown copyright and database right, Royal Mail data © Royal Mail copyright and database right, and National Statistics data © Crown copyright and database right. Results are a guide only. Your water bill confirms your supplier and sewerage company.