Dwr Cymru Welsh Water

COVID-19 (Coronavirus) – A Message to Our Customers - 30 March 15:00

We know that this is a difficult time. We also know that the water and wastewater services we provide play a key role in protecting public health and safeguarding the customers and communities we serve.

We are doing all we can to protect our colleagues while also maintaining our services to customers. You will still see us working in streets and communities during this time but we are only doing essential work that will help protect public health by maintaining water and wastewater services to customers.

Our Billing Call Centre is open from 9am - 5pm (Monday to Friday) to support our most vulnerable customers who have been impacted by the Coronavirus.

If you’re impacted by COVID-19 (Coronavirus) and concerned about your water bill, please click here for more information.

If you need to contact us about other things like updating your account, to let us know you are moving or to set up a direct debit, you can do this by visiting our online services.

We will keep you informed of any other changes through updates on this site and via our social media channels - Facebook & Twitter.

We apologise for this but will do everything we can to continue providing our essential services. Thank you for bearing with us.

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
  • Must be capable of receiving and processing TRADACOMS 26 version 3 protocol
  • 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
  • Must be capable of receiving and processing TRADACOMS 26 version 3 protocol
  • 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
  • Must be capable of receiving and processing TRADACOMS 26 version 3 protocol
  • 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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