Plaid Cymru Ynys Môn have called on the Welsh and UK Governments to intervene in order to protect the water quality along our coastlines.
In a meeting of Anglesey County Council on Thursday, Councillor Nicola Roberts asked her fellow Members to support her motion calling for intervention from the UK Government and Welsh Government to restrict the amount of sewerage being poured into the sea.
"During the last few months we have witnessed several examples of sea water being effected by dirty water which affects the residents of the island, the tourism sector and wildlife," she said.
"Awful figures from Welsh Water confirm that there are over 20,256 hours in a year where waste water was discharged freely into our waters. This high number of hours shows that this way of discharging waste water is used as a regular occurrence rather than used in emergencies only."
Nicola and her fellow councillors, Llio Angharad Owen (Talybolion) and Neville Evans (Crigyll) attended an event on Crigyll Beach, Rhosneigr in August in order to support a protest by a group of surfers and wild swimmers.
"The vast majority of our coastline here on Anglesey has been designated an Area of Outstanding Natural Beauty and many, many locals and tourists use our beaches on a daily basis," said Neville Evans.
"It is not acceptable that groups of wild swimmers or surfers need to be aware of sewerage being poured into our seas before being able to enjoy their activities."