Cllr Barney Fitzpatrick said: “This is bad news for the wider Coleraine area because it could have an impact our tourism market.
“Blue flag status is vitally important for beaches, for local business and for the hospitality industry which depends on tourists.
“While there may be factors like increased rainfall that have affected water quality, this matter still must be addressed urgently to ensure that blue flag status can be achieved in these areas next year.”