First issued in early February, the notice affects 213 residences from Barndarrig village to parts of Kilbride.
New monitoring equipment is being installed at the treatment plant after elevated levels of nitrite were found in the water supply.
The water is not safe for consumption or for the preparation of foods but can be used for hygiene and use in washing machines and dishwashers.
An alternative water supply remains in place for customers impacted by the notice, with bottled Water available at the car park opposite Barndarrig Church.
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