Supplier enquiries

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We are the UK's largest water and wastewater services company. Every day, we supply around 2,600 million litres of tap water to 9 million customers across London and the Thames Valley. We also remove and treat more than 4 billion litres of sewage for 15 million customers.

This means we have a diverse network of suppliers delivering everything from everyday equipment to operations and maintenance services.

Contact us

Builders and developers

If you are a builder or developer and wish to contact us in relation to any size of housing development, please visit our Builders and developers section.


If you are interested in knowing more about our Approved Plumbers scheme, please email

Current suppliers

If you are already one of our suppliers and have an invoice or payment query, please do not use the pink button below. Instead, you should email

For Thames Water to process your invoice correctly, please comply with the following.

Prospective suppliers

Achilles UVDB registration and Verify accreditation: Thames Water engages the services of Achilles Group Ltd in the assessment of the Health and Safety capabilities of suppliers.

Depending on the goods and/or services you supply you may be required to register with Achilles UVDB and obtain a Verify accreditation, with health and safety MSE and SITE (if appropriate) audit scores in excess of 80%.

Please note: Thames Water will not meet or reimburse any of the costs incurred by suppliers in registering with Achilles UVDB or gaining Verify accreditation.

If you are a supplier and would like to speak to us regarding a product or service you are able to provide please click on the pink button below.

Supplier enquiry

We aim to respond to all supplier enquiries within 10 working days.