Latest data on the status of surface and ground water shows that 40% of 933 surface and ground water bodies were at good or better status in 2021.
Wrth edrych ar y dangosydd cenedlaethol, sy’n cyfuno cyrff dŵr daear a dŵr wyneb, mae gan 40% o’r holl gyrff dŵr statws da neu well yn 2019.