EDI | Our Services | Business | Dwr Cymru Welsh Water
Dwr Cymru Welsh Water

Electronic Data Interchange

At Welsh Water we take a proactive approach to ensuring we can provide flexible billing options for our water customers.

We have recently expanded our flexible billing options which already include paper billing and consolidated billing and we have invested in developing our electronic billing (EDI) capabilities.

We are now able to provide e-billing to the UK industry standard, TRADACOMS 26 version 3 protocol.

EDI, also known as Electronic Data Interchange enables billing data to be sent directly from one computer system to another, eliminating paper, speeding up processing times and cutting costs associated with manual processing.

Eligibility Requirements

  • Must be a business customer with 10 or more sites within Welsh Waters operating area
  • Suitable for metered accounts only (Currently excluding multi-metered sites)
  • Must be capable of receiving and processing TRADACOMS 26 version 3 protocol
  • Currently not suitable for accounts that are subject to VAT
  • Not suitable for trade effluent accounts

Frequently Asked Questions

What is EDI billing?

EDI, also known as Electronic Data Interchange enables billing data to be sent directly from one computer to another, eliminating paper, speeding up processing times and cutting costs associated with manual processing.

How often is an EDI bill sent?

Monthly, before the 7th of each month.

Will I receive a paper bill as well as the EDI?

No. The EDI message is the invoice and replaces the paper bill.

How do I apply for EDI billing?

You can complete the EDI application form on our EDI web page. Please check the eligibility criteria first before applying.

What criteria do I have to meet before applying for EDI billing?

To be eligible for EDI billing you must meet the below criteria:


  • Must be a business customer with 10 or more sites within Welsh Waters operating area
  • Suitable for metered accounts only (Currently excluding multi-metered sites)
  • Must be capable of receiving and processing TRADACOMS 26 version 3 protocol
  • Currently not suitable for accounts that are subject to VAT
  • Not suitable for trade effluent accounts

For further information please request a copy of the EDI Terms & Conditions by contacting us at edi@dwrcymru.com

Can I choose what accounts I want included in the EDI bill?

Yes, if you meet the eligibility criteria in order to apply for EDI billing, we can then work with you to agree the accounts that are suitable.

Can I add in and remove accounts to my EDI bill?

Yes. You can contact the Commercial Billing Team at edi@dwrcymru.com and ask for further information.

Can I revert to paper billing?

Yes, subject to the EDI Terms & Conditions you may revert back to paper billing.

Are there any limitations on what can be included in an EDI bill?

You must meet the following eligibility criteria before applying to receive EDI


  • Must be a business customer with 10 or more sites within Welsh Waters operating area
  • Suitable for metered accounts only (Currently excluding multi-metered sites)
  • Must be capable of receiving and processing TRADACOMS 26 version 3 protocol
  • Currently not suitable for accounts that are subject to VAT
  • Not suitable for trade effluent accounts

Who do I contact with a query about EDI billing?

If you haven't been able to find the information you are looking for here, you can contact the Commercial Billing Team at edi@dwrcymru.com

Are consolidated billing and EDI billing the same thing?

No, EDI is the computer-to-computer transfer of invoices between two organisations using an agreed industry standard. Consolidated billing does not meet this criteria, but if you are interested in finding out more about consolidated billing please contact us at Consolidated.Billing@dwrcymru.com

If our system is not compatible with TRADACOMS 26 Version 3 protocol can I still go on to EDI?

No, unfortunately you will need a compatible system in order to receive EDI bills.

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