Thousands of homes in Rhondda Cynon Taf are covered by the boil water notice
13:24, 22 May 2026Updated 13:42, 22 May 2026
The boil water notice covers a huge part of the Rhondda(Image: WalesOnline/ Rob Browne)
Welsh Water has told residents in Rhondda Cynon Taf to boil their tap water before drinking it due to an issue that was identified at treatment works. The boil water notice covers a huge area of the Rhondda and wider Rhondda Cynon Taf area.
In a notice on the Welsh Water website the organisation said an issue was identified “with the chemical process” used to treat drinking water during routine checks at Maerdy Water Treatment Works on Friday morning.
Customers are not expected to experience any loss of service as a result of this issue. Get the latest Rhondda news first by signing up to our newsletter here
Welsh Water said the boil water notice for customers served by the Maerdy treatment works has been issued “as a precaution” while further investigations are carried out.
Bottled water stations are being set up for affected customers.
The full list of areas affected by the notice are:
- 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
“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,” Welsh Water said.
The organisation added that customers who are impacted are being sent a text. You can check if you area is affected using the postcode checker here
WalesOnline has approached Welsh Water for more information.
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