Sut y mae Llywodraeth Cymru yn mesur lefelau carthion mewn afonydd?
Wedi'i ateb gan Y Dirprwy Brif Weinidog ac Ysgrifennydd y Cabinet dros Newid Hinsawdd a Materion Gwledig | Wedi'i ateb ar 03/10/2024
River water quality monitoring, which includes monitoring sewage discharges, is undertaken by Natural Resources Wales. NRW publishes annual environmental performance reports for both companies operating in Wales. Further information on NRW’s role in monitoring and enforcement can be found at the following link Natural Resources Wales / Storm Overflows.