Mr Teal is calling on WWUP backers - Greater Wellington Regional Council and Government through the taxpayer-funded Irrigation Acceleration Fund - to be fiscally responsible and look at more economically and environmentally sustainable options.
He said rather than waste more rates and taxes on uneconomic dams, the regional council and Government should be backing future farming initiatives such as low-input farming systems.
"These are much better suited to dry areas and are proven to be more profitable than high-input, water-intensive industrial farming operations. Better for farmers and better for the environment; a win-win."
Wellington Fish and Game has had concerns about WWUP for some time for going well beyond its brief and acting as an irrigation advocate, rather than providing the Wairarapa community and its leaders with balanced, objective information.
"WWUP is supposed to be conducting a feasibility exercise.
"Instead it is acting as a pro-irrigation lobby. The quality of the debate in the community about the merits of irrigation is suffering as a result."
He said Wairarapa and civic leaders were being "promised the world", but WWUP was failing to put in front of them the many downsides to schemes, "not least of which are the huge costs that are inevitably borne by the community and the environmental impacts".
Mr Teal said despite what WWUP would inevitably now try to claim, the project was always predicated on intensive dairy expansion.
"WWUP has always been a dairy-heavy project. Their own figures show an expected doubling of intensive dairying. No other land use could, or can, afford the water.
"It's time to can the dam and concentrate on assisting struggling farmers convert to more profitable, sustainable systems."