Falling water levels have been detected at Leathemstown Reservoir in Lisburn, according to NI Water.
However, the firm confirmed it will not effect customers water supplies but an inspection will have to be carried out.
The reservoir has been out of service since 2007 and will need to be nearly empty before staff can attempt to enter the tower to carry out the inspection.
Stewart Walsh, NI Water, said: "While this will have no impact on customers water supply and the reservoir is not presently leased for fishing, members of the public may have concerns regarding fish stocks. We are working with our colleagues in NIEA and Inland Fisheries to attempt to remove fish and release them to a local watercourse."
(CD/MH)
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