This information should not be relied upon as legal or professional advice. Read the disclaimer.

This page provides contact information for water companies and other relevant bodies that deal with a range of water-related issues in England and Wales.

The geographical area of water and wastewater companies doesn’t always align with other boundaries such as constituencies or local authorities. Water and wastewater companies provide vital services to constituents and this page aims to help MPs and their staff identify responsible companies and their contact details. In some cases, it may be necessary to contact industry regulators, local authorities or other organisations to deal with an issue. Further details on this are provided below the dashboard maps.

Use the dropdown menu below to select the constituency you’re interested in and view which water and wastewater companies serve that area.

To confirm the water supplier for your postcode, you can use the Water UK online tool. Please note that this tool only looks up the water supplier. The wastewater company may be different.

Water Companies in England and Wales

There are 11 regional water and wastewater companies and a further 6 water only companies in England and Wales. There are also some specific geographic areas served by small limited companies (new entrants). Some customers receive water and wastewater services from different companies.

Domestic customers are usually served by their regional supplier, however, in some cases, for example on a new development, the site owner may choose another company to provide the water and wastewater services. More information about this process is available here.

Water companies in England and Wales are regulated by four independent bodies across three areas:

For more information on how water companies in England & Wales are performing across the three areas visit Discover Water.

Interactive Dashboard: Water and Sewerage Companies by Constituency

Open a printable version

Download all data in Excel (126 KB)

If you would like to access this information in an alternative format please email and we will review your request.

Who to speak to

Your water or sewerage company should be able to provide information and resolve issues relating to water supply and wastewater drainage. However, for a number of other water-related incidents or queries you may need to speak to the Environment Agency, your local authority or other independent body. Below are some examples of commonly occurring issues and the appropriate organisation to contact for help in resolving them.

Organisation or Body Types of water related issues they deal with Contact Information
Your Water or Sewerage Company ·                  Water supply problems

·                  Water quality issues

·                  Bills and payments

·                  Reporting leaks

·                  Making complaints


Contact details available in the tables above the constituency maps

Environment Agency, Natural Resources Wales ·                  Report water pollution incidents

·                  River flooding

·                  Guidance on septic tanks & small sewage treatment plants

·                  Freedom of information requests

Environment Agency contact details

Natural Resources Wales contact details

Local Authority ·                  Blocked drains

·                  Environmental health concerns

·                  Local flooding issues

Find your district council in the dashboard or in the list of contact details here.
Consumer Council for Water ·                  Unresolved water company complaints (excluding water quality issues) Telephone:

0300 034 2222 (England)

0300 034 3333 (Wales)

Online contact form

Drinking Water Inspectorate ·                  General water quality enquiries

·                  Unresolved problems with your drinking water quality



0300 068 6400.

Ofwat Disputes concerning:

·                  Guaranteed standards scheme

·                  Water connections

·                  Sewerage connections.

Full list of specific complaints and disputes 


07595 087 465

Online enquiry form

Further contact details

Additional Library Resources

Autumn and winter floods, 2019-20

This is a House of Commons Library briefing paper on the serious flooding that occurred in the UK during the autumn and winter of 2019-20.

Economic regulation of the water industry in England and Wales

This briefing paper provides an overview of the economic regulation of the water industry in England and Wales. It provides an overview of the price review process that sets customer bills and water company service targets every 5-years. It includes a summary of the 2019 price review that followed increasing public scrutiny of the sector.

Household flood insurance: Flood Re

A library briefing paper on how Flood Re helps to manage an affordable market for flood insurance for most householders

Sewage (Inland Waters) Bill

This briefing paper covers the Sewage (Inland Waters) Bill 2019-21, a Private Members Bill introduced by Phillip Dunne MP.  The Bill would amend the Water Industry Act 1991 and place a duty on water companies to ensure that untreated sewage is not discharged into rivers or other inland water bodies.

Sewer Flooding

This Commons Library Briefing Paper provides information on sewer flooding, including why it happens, responsibilities for addressing the problem and information on possible compensation. This note does not constitute legal advice. Information on longer term approaches to sewer flooding and sewer connections is also included.

Water meters: the rights of customers and water companies

This Commons Library Briefing Paper explains the powers that customers and water companies have in opting for charging with water meters. It also provides an overview of the relevant Government policy and legislation.

Water quality

This Commons Library Briefing Paper examines water quality in the UK, including EU requirements and potential impacts of Brexit. It sets out some key facts and figures for England, Wales, Scotland and Northern Ireland, explains how water quality is measured and discusses action being taken by the Government to manage and improve water quality.

Water: non-household retail competition

A short Commons Library Briefing paper providing an update on the water retail market for non-household customers in England. It includes information on support for business customers during the coronavirus outbreak in each nation.

Data sources and calculations

This analysis is based on geographical boundary data from Ofwat. You can download these shapefiles at the links below. This is the most recent version of the boundaries of the regional water companies (May 2022) but new inset appointments are being granted every month. Please email if you need a copy with the most recent version of the inset appointment boundaries. The data is provided under the Open Government Licence.

Geographical boundaries for environment agency regions are available from Defra here.

Please note that in the analysis above we have adapted four company names from the Ofwat boundaries to help reflect names that residents and consumers may be more familiar with:

  • In the Hartlepool Area, Anglian Water is named “Hartlepool Water (part of Anglian Water)”
  • In Essex and Suffolk, Northumbrian Water is named “Essex and Suffolk Water (part of Northumbrian Water)”
  • In the Bournemouth area, South West Water is named “Bournemouth Water (part of South West Water)”
  • In the Cambridge area, South Staffordshire Water is named “Cambridge Water (part of South Staffs Water)”
  • In the Bristol area, South West Water is named “Bristol Water (part of South West Water)”.


For each company/constituency pair, an estimated percentage of properties is shown as an approximation of how much of the constituency each company covers. This is estimated based on the geographical coordinates of unique property reference numbers in the ONS UPRN directory. The percentage of properties doesn’t necessarily match the percentage of the population covered by each company, but it is a better approximation than the percentage of the geographical area covered.

There are some small Intersections of company boundaries and constituencies which do not contain any properties are not listed or mapped.  Intersections containing less than 30 properties are listed as “few properties. Some of these very small overlaps may be artefacts arising from small mismatches between GIS boundaries.

Information about the data

Ofwat’s data was updated on 25th May 2022. The boundaries don’t include information on any premises or installations that are located outside the boundary but included in the area (or vice versa). The boundaries are digitised from legal records by the Water Services Regulation Authority (Ofwat) with support from Ordnance Survey. The digital representation of water companies isn’t a legal record of the boundary. The definitive legal record of areas is set out in the appointments of the water and/or sewerage undertakers.

Data updates

We aim to update this dashboard when Ofwat provide new data. MPs and their staff can contact the Commons Library with queries about updates.


The Commons Library does not intend the information in this article to address the specific circumstances of any particular individual. We have published it to support the work of MPs. You should not rely upon it as legal or professional advice, or as a substitute for it. We do not accept any liability whatsoever for any errors, omissions or misstatements contained herein. You should consult a suitably qualified professional if you require specific advice or information. Read our briefing for information about sources of legal advice and help.