However, Irish Water said if a customer's address or personal details have not changed that they will not have to contact the firm to get their refund.
Payments are being made by cheque.
Head of Customer Operations for Irish Water, Eamon Gallen said: "The two big questions that customers have is how much they will receive and when they will receive it. Household customers can be assured that they will receive the full amount they paid, and customers will shortly be able to check online exactly how much they are due and when there are likely to receive their refund.
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"Irish Water have been working in the background for several months to ensure that refunds will be ready to go as soon as we are authorised to do so by government. Our priority is to ensure that those who paid their household charges get their refund as quickly and efficiently as possible. This is why I would urge any customers who have not informed us of a change of address to do so now so that their details are up to date and there is no delay in issuing their cheque."
www.water.ie/for-home/refunds/
(CD/LM)
