Effeithiwyd ar lai na 90 o fusnesau mewn porthladdoedd yng Nghymru gan yr adolygiad hwn o drethi, ac mae'r rhan fwyaf o'r rhain naill ai wedi talu eu trethi ôl-ddyddiedig yn llawn neu'n talu eu biliau fesul rhandaliadau y cytunwyd arnynt ag awdurdodau lleol.
Fewer than 90 businesses located in ports in Wales were affected by this rating review, and around 50 of these have paid their backdated liability in full. The remainder are either paying their bills by schedules of instalments agreed with local authorities, or have yet to make payments.