Raw sewage is flowing into the environment from 35 towns and villages every day.
A new report from the Environmental Protection Agency has highlighted 113 locations where Irish Water needs to prioritise wastewater treatment to protect public health and the environment.
It also found that 19 large towns and cities, including Dublin and Cork, have failed to meet EU standards to prevent pollution.
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No towns in the Shannonside region are included in the lists.
Mohill is highlighted as an area where there is sole pressure on water at risk of pollution improvements need to be made to the collection systems in Roscommon in Athlone.
