Wastewater discharges are being highlighted in Portarlington, Ballymore, and Kilcormac.
Towns in Laois, Offaly and Westmeath have been cited by the EPA's annual report for producing pollution affecting local rivers and lakes.
Wastewater discharges are being highlighted in Portarlington, Ballymore, and Kilcormac as three of 34 areas across the country that require investment.
The Environmental Protection Agency says Uisce Éireann has failed to act on this evidence despite being aware since 2017 of the need to improve water treatment in those areas.
Niall Horgan is a senior wastewater compliance manager with Uisce Eireann - he says significant progress has been made, but there are still many challenges ahead:
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