Who we are Dwr Cymru Welsh Water keep 3 million people healthy each day with safe, reliable water, and take away wastewater to clean, before returning it safely to our beautiful rivers and seas. Llys y Fran is our largest reservoir in Pembrokeshire residing in the foothills of the Preseli Mountains. The site had a £4m refurbishment reopening the Visitor Centre with a new café, retail area and a super