The impact of the loan changes would mean an extra $60,000 would have to come from sewerage rates next financial year, above what had been budgeted for in the draft plan.
Mr Paris said extra capital and borrowing costs for the scheme will be factored into the year-end position and that interest and loan repayment budgets will be revised for the final Long Term Plan. He confirmed the council's total indebtedness against the Homebush project stands at $36 million.
Mr Holmes said councillors should be looking at where "we can actually save something".
"It may be cheaper in the long run to look at what Carterton has done and to use pond 3 for treated water," he said.
In the past Mr Holmes advocated using centre pivots to distribute wastewater to land, as Carterton now does, and the reference to pond 3 was for it to be used for storing treated wastewater to then used to irrigate farmland.
Responding to Mr Holmes, council chief executive Pim Borren said "no-one could suggest the project hasn't been successful", at least in the time he had been with the council.
The Homebush project is included in the chief executive's contract as a key performance indicator.
Outside the meeting room, Mr Holmes said the council had been warned "right from the start of the consent process" about the problems it would encounter getting rid of sludge from the old ponds.
He said the reality was that work had "overshot the budget by many thousands" and only pond 1 and half of pond 2 had been drained to become part of the border dyke wetland area.
The sludge had to be removed as it contained "plastics, hypodermic needles and other rubbish", he said.