The Green Party is calling for action to improve water quality in Dublin Bay.
The party says the water treatment systems are currently not fit for purpose and in urgent need of investment and upgrading.
Green Party candidate for Dún Laoghaire, Ossian Smyth, said the investment would come from existing development levies.
"Developers and land owners are making huge quantities of money out of developing sites. They need to pay for the water infrastructure for the new residents," he said.
Mr Smyth criticised Fianna Fáil for saying it would drop land development levies.
"We badly need development levies to provide the much needed infrastructure, and that includes water treatment, it includes cleaning up water supplies," said Green Party MEP Ciarán Cuffe.
Last summer, nine beaches and swimming areas were closed to swimmers in Dublin due to the release of untreated sewage in Dublin Bay from the Ringsend Water Treatment Plant.
Mr Cuffe said it is not acceptable that large chunks of Dublin Bay are not available to bathers in the summer months.
The Green Party said it would fast-track upgrading works to minimise the risk of this happening again.