Seven water supplies have a high level of a pollutant that's been linked to cancer.
Trihalomethanes are chemicals found in water treated with chlorine.
Latest test-results show four supplies in Wicklow had above the allowable limit, along with two in Donegal and one in Kilkenny.
Irish Water says a conclusive link hasn't been found between THMs and serious illnesses, but environmental consultant Jack O'Sullivan says the findings are still a concern:
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