The boil water notice which had affected thousands in Birr, Banagher and South Offaly has been lifted tonight.
In a statement, Irish Water said, following consultations with the Health Services Executive, it was removing the boil water notices from the Dunkerrin, Birr and Banagher Public Water Supplies with immediate effect.
"All due diligence has been taken to ensure the safety of all the users of all three public water supplies arising from the failure of a single sample taken from each of the supplies in Dunkerrin, Birr and Banagher PWS. Following further sampling and testing over the weekend we can confirm that all three water supplies are safe to drink," the statement said.
Irish Water said it was informing media and stakeholders and would make direct contact with those who registered with it as vulnerable customers.
"A leaflet drop to the customers on the three schemes is being organised on behalf of Irish Water by Offaly County Council for tomorrow (Monday)."
Irish Water and Offaly County Council acknowledge the patience, co-operation and assistance of affected customers during the period of the boil notice and apologise for the inconvenience and disruption caused to householders and the business community.
Queries in relation to this notice may be directed to the Irish Water Customer Contact Centre on 1850 278 278.