Cloncon, Derrybeg, Balinvally, Raheenduff, Newtown and The Meelaghans are the areas affected.
People are being warned not to use their water in Offaly after a potential pollution incident.
The Board of the Killeigh Group Water Scheme is warning people not to use their tap water for drinking or food preparation.
The areas affected are Cloncon, Derrybeg, Balinvally, Raheenduff, Newtown and The Meelaghans.
Chairperson of Tullamore Tidy Towns Shane Murray says the warning has gotten more serious overnight:
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