A Do Not Consume notice has been put in place for the Bunnoe Group Water Supply.
Cavan County Council issued the notice with immediate effect to protect the health of all scheme users.
Boiling the water won't make it safe for use, and it can't be used for drinking, preparing meals or brushing teeth.
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An alternative supply is being provided from tankers at Bunnoe Community Centre and Corrgarry Church in Drum, Co. Monaghan.
Anyone taking this alternative supply is reminded that it must be boiled before use.