Under the Regulations NRW, sewerage undertakers, and the relevant Local Authority are given a number of statutory duties that they must carry out at designated bathing waters.
O dan Reoliadau CNC, rhoddir nifer o ddyletswyddau statudol i ymgymerwyr carthffosiaeth, a'r Awdurdod Lleol perthnasol, y mae'n rhaid iddynt eu cyflawni mewn dyfroedd ymdrochi dynodedig.