Water quality in Wales has improved very markedly over recent decades but there is more for us to do to restore river health and promote a sustainable economy.
Mae ansawdd dŵr yng Nghymru wedi gwella'n sylweddol iawn dros y degawdau diwethaf ond mae mwy inni ei wneud i adfer iechyd afonydd a hyrwyddo economi gynaliadwy.