Os na chydymffurfir â Hysbysiad Gwella Mangre, neu os bydd achos o beidio â chydymffurfio yn ddigon difrifol, gellir cau mangreoedd drwy ddyroddi Hysbysiad Cau Mangre.
Where a Premises Improvement Notice is not complied with, or if there is a serious breach, premises can be closed by issuing a Premises Closure Notice.