Responsibility for private sewers rests with all of the properties that are connected to the system up to and including the point of connection with the public sewer.
Mae pob eiddo sydd wedi'i gysylltu â'r system yn gyfrifol am garthffosydd preifat, hyd at y fan lle ceir cysylltiad â'r garthffos gyhoeddus a chan gynnwys y fan honno.