Contact Us | Changes to the Market from 2017 | Dwr Cymru Welsh Water
Dwr Cymru Welsh Water

Sunday, 23rd February – 18:00

Our water treatment works in Mayhill, Monmouth is now operational and supplying clean, fresh drinking water direct to customers’ taps. We still have some workers on site and will keep some tankers in the area as a precautionary measure for the next 24hours or so. Thank you #Monmouth for your support and patience over the past week. Diolch!

Monmouth update

Open Water Contact Us

If you are an Open Water Customer and you have any other questions, you can email the Business Customer Team at or complete this quick form and they will be happy to help. Please contact Welsh Water on:

0800 260 5051

If you are not an Open Water customer, but you have questions, please contact Welsh Water on:

0800 052 0145

For more information about the new market, eligibility criteria and switching, please visit

If you are a Retailer looking to set up a contract with Welsh Water wholesale, please contact the Wholesale Service Centre on 0800 260 5053 or 

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