When looking at the national indicator, which combines groundwater and surface water bodies, 40% of all water bodies are at good or better status in 2019.
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.