‘Good surface water status’ is that achieved by a surface water body when both its ‘ecological status’ and its ‘chemical status’ are at least good.
‘Statws dŵr wyneb da’ yw’r hyn sy'n cael ei gyflawni gan gorff dŵr wyneb pan fydd ei ‘statws ecolegol’ a’i ‘statws cemegol’ yn dda o leiaf.