22/05/2026
⚠️ BOIL WATER NOTICE – IMPORTANT UPDATE ⚠️
Dŵr Cymru has issued a boil water notice for people living in these areas:
Blaenllechau, Bryngolau, Cymmer, Dinas, Edmondstown, Ferndale, Hopkinstown, Llwyncelyn, Maerdy, Tylorstown, Penrhys, Pontygwaith, Porth, Pwll Gwaun, Pantygraigwen, Pontypridd (Treforest), Trebanog, Rhiwgarn, Tonyrefail, Tyn Y Bryn, Trehafod, Wattstown, Williamstown and Ynyshir.
What does this mean?
Before using tap water for:
• Drinking
• Brushing teeth
• Making ice
• Cooking
You MUST boil the water first and let it cool before use.
Why is this happening?
Dŵr Cymru found a problem during routine water quality checks at the Maerdy Water Treatment Works. To make sure people are safe, they stopped water from that site entering the network while they investigate.
Water supplies are still running
Dŵr Cymru do not expect customers to lose water supply
Customers affected should receive a text message.
🔎 Check if your postcode is affected here: https://www.dwrcymru.com/en/boil-water-notice
Bottled water stations are being set up, and bottled water will be provided to vulnerable customers on the Priority Services Register.
Dŵr Cymru says they are working as quickly and safely as possible to resolve the issue and will continue to share updates on their social media channels.
⚠️Boil Water Notice ⚠️
This affects customers living in the following areas:
Blaenllechau, Bryngolau, Cymmer, Dinas, Edmondstown, Ferndale, Hopkinstown, Llwyncelyn, Maerdy, Tylorstown, Penrhys, Pontygwaith, Porth, Pwll Gwaun, Pantygraigwen, Pontypridd – Treforest, Trebanog, Rhiwgarn, Tonyrefail, Tyn Y Bryn, Trehafod, Wattstown, Williamstown, Ynyshir.
During the course of routine checks we make on water quality, we have identified an issue with the chemical process we use to treat drinking water at our Maerdy Water Treatment Works. As a precaution, we temporarily stopped water from the site entering the network while we investigate and resolve the issue.
Customers will continue to receive water supplies and we do not expect any loss of service. However, as a precaution whilst we investigate further, we have issued a boil notice to customers served by this WTW.
Customers who are impacted are being sent a text and additional information is on our website dwrcymru.com
All customers in these areas are advised to boil their water with immediate effect before using it for drinking, brushing teeth, making ice and cooking purposes.
Our boil water notice page dwrcymru.com/boilwaternotice also includes a postcode checker to identify those areas affected.
We are setting up bottled water stations and will provide bottled water directly to the most vulnerable customers registered on our Priority Services Register.
We are sorry for the inconvenience this will cause and are working as quickly as possible to resolve the issue safely. We will provide more information as it becomes available, check our social media channels for further updates.
