The Do Not Consume Notices have been lifted for two Cavan water supplies.
Customers on the Billis-Lavey and Kilsherdany Group Water Schemes are now being told that the water is once again safe to drink.
The notices had been in place since early September due to increased levels of manganese.
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The HSE and Cavan County Council says the water is now safe to drink and for food preparation.
People are being advised to run their taps for up to 30 minutes to flush out the system.