Workers at Infrastrata recently ended the drilling after failing to locate any oil in the area.
Speaking at a Growth and Regeneration Committee of Belfast City Council, officials from NI Water said: "The security and safety of the public water supply is NI Water's top priority.
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"Measures to ensure the safety and security of the water supply were implemented and closely monitored throughout the process. As a further precaution, and to assist with allaying public fears, NI Water put increased monitoring of raw water in place at all reservoirs, and at the treatment works.
"In the event of oil being found, Infrastrata would have been required to submit full planning permission. In this event, NI Water would, as always, have given absolute priority to the safety of the public water supply."
(CD/LM)
