Grand Canal Dock, the Tolka and Balbriggan have been branded 'littered' in a new survey of beaches, rivers and harbours.
The Tolka at Annesley Bridge is 'heavily' littered according to Irish Business Against Litter.
Dun Laoghaire, Seapoint, Skerries and Portmarnock were also singled out in the research.
Cigarette butts, sweet wrappers, plastic bottles and cans are the biggest problem.
