Wellington mayor Celia Wade-Brown is defending a city council decision to shelve plans for a $20 million reservoir and said a pipeline across the harbour is a better option.
Had the project gone ahead, it would have been the region's biggest reservoir, with the capacity to supply Wellington Hospital in the event of a large earthquake.
It was suspended after the district health board could not reach agreement with the council on how much it would contribute. An investigation into the project cost about $500,000.
Ms Wade-Brown said on Wednesday that building a pipeline across the harbour from Seaview is a better option - and not just for the hospital.
"If it comes from the Seaview area and to, for example, Point Jerningham, you'll be able to take advantage of the four water sources in the Hutt Valley - Gear Island, Wainuiomata, the Hutt Valley Aquifer and the Kaitoke area. So that would be able to provide continuous supply."