Pa fesur y mae Llywodraeth Cymru yn ei ddefnyddio i fonitro ansawdd dŵr afonydd?
Wedi'i ateb gan Y Dirprwy Brif Weinidog ac Ysgrifennydd y Cabinet dros Newid Hinsawdd a Materion Gwledig | Wedi'i ateb ar 10/09/2024
River water quality monitoring is undertaken by Natural Resources Wales. I refer the Member to Section 4 of the Senedd Research Briefing on Water Quality in Wales, which sets out how the water quality of all water bodies in Wales, including rivers, are assessed.