Thames water business
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Thames Water provides water and wastewater services to 16 million people and over 200,000 commercial properties.
Thames Water is responsible for operating and maintaining all the water supply pipes within the Thames Basin region, but it does not directly supply businesses. Instead, a designated business water supplier handles meter readings, customer services, and billing for commercial customers.
This guide offers comprehensive information about water services for businesses in the Thames Water area.
Prior to the deregulation of the English water market in April 2017, Thames Water directly supplied and billed these business customers.
Upon deregulation, the supply to all non-household properties in the Thames Water supply area was transferred to a business water supplier, Castle Water. Although Thames Water continued to operate the water infrastructure, responsibilities for meter readings, billing, and customer services were transferred to Castle Water.
Since then, businesses in the Thames Water area can choose their business water supplier from any of the Ofwat licensed providers.
Approximately 30% of businesses in the Thames Water area have since switched from Castle Water to other providers. Find out more in our comprehensive guide to business water suppliers.
Source: MOSL supply points dashboard
Thames Water operates water services within the Thames Basin. The River Thames has its source in the Cotswold Hills and flows through all the way to the Thames Estuary in Essex.
The map below illustrates the areas where Thames Water operates and maintains the water and wastewater pipes connected to commercial properties:
Source: Thames Water Developers
The area supplied by Thames Water for water and wastewater are slightly different, as follows:
Thames Water delivers wastewater services to a broad area encompassing most of Gloucester, Oxfordshire, Berkshire, Buckinghamshire, Hertfordshire, Greater London as well as North Surrey, North Wiltshire, and far West Kent.
Thames Water’s potable water supply area is the same as its sewerage supply area, with the exception of certain regions that are served by separate water-only companies:
If you are constructing a commercial property within the Thames Water region and require water or wastewater services, you must arrange a business water connection with Thames Water.
You can request a new water service connection through Thames Water using their application form, which is available here.
Once your new water connection is established, Thames Water will automatically assign a business water supplier for your supply. For more information, refer to our comprehensive guide on business water connections.
Yes, Thames Water functions as a wholesaler in the commercial water market. It is the largest wholesale provider of water and wastewater services in the UK.
Thames Water sells its water services to business water suppliers on a wholesale basis using regulated wholesale water rates.
For more information, check out our guide to British Water Infrastructure.