The regional council proposed a 20 cents to 30 cents per cubic metre range for farmers to buy water from the dam and Mr Wills agreed the cost was "up there".
"There's no doubt this will lead to a change in land use in order for people to be able to afford to buy the water. So we need to make sure it is affordable because there is no use building the dam and making it so expensive that farmers can't see an economic driver to pick it up."
Mr Wills said he would not be able to attend the council meeting but would be waiting to hear the outcome of the vote.
"I would be surprised if it isn't supported to go through to the next stage. I think Hawke's Bay ratepayers will support it."