A new report has found raw sewage is being discharged into rivers, lakes and coastal areas in 45 locations around the country.
This Urban Waste Water report from the Environmental Protection Agency shows that of the areas where raw sewage is being pumped into rivers, lakes and coastal areas - more than half are in Cork, Donegal and Galway.
In the 45 places listed, waste water received no treatment or just preliminary treatment before being discharged. 11 of these are in Donegal - Bundoran, Burtonport, Coolatee, Falcarragh, Kerrykeel, Kilcar, Killybegs, Moville, Ramelton Rathmullan and St Johnston.
Meanwhile, Bundoran, Convoy, Killybegs and Lifford failed to meet effluent quality and sampling standards, according to the report.
In a statement, Irish water says the discharge of untreated sewage will end by 2021.
The company says it plans to invest another 2 billion euro in wastewater infrastructure over the next six years.