It comes as areas in Offaly have been under a 'do not consume' notice from the Killeigh Group Water Scheme.
The Environmental Protection Agency says there's an urgent need for mandatory registration of private drinking water supplies.
It's raising concerns that many private supplies are not registered - despite serving schools, nursing homes, sports clubs and self-catering accommodation.
It comes as people living in Offaly have been issued with a 'do not consume' notice from the the Killeigh Group Water Scheme.
The areas affected are Cloncon, Derrybeg, Balinvally, Raheenduff, Newtown and The Meelaghans.
The EPA's Noel Byrne is Programme Manager of the Drinking Water and Wastewater Enforcement team - he says everyone has a right to safe drinking water, and supplies that aren't registered, aren't being monitored:
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