Cosb y dywed Ofwat y byddai wedi’i gosod fel arall

£40.6 miliwn5 Mehefin 2026ffynhonnellhyder uchel

Ofwat, enforcement case into Dŵr Cymru's sewage treatment works and sewerage network'£40.6 million, 7.5% of the company's relevant turnover'