Community groups are seeking help to stop the $950 million central interceptor project.
The Manukau Harbour Restoration Society, Onehunga Enhancement Society and Mangere Bridge Residents and Ratepayers group have lodged a joint appeal to the Environment Court over the 13km pipeline.
Auckland Council-controlled organisation Watercare was last month granted resource consent for the tunnel.
It will deliver up to 2 million cubic metres of sewage and stormwater to the Mangere wastewater treatment plant every year.
The water will then be treated and released into the Manukau Harbour.
Restoration society chairman Jim Jackson says Watercare is not following best practice and the project could have negative effects on the harbour.
The groups are looking to raise $140,000 to fund their appeal, he says.
"Already there are donations flowing in from people who are really concerned about what's going to happen."
Go to mhrs.org.nz to donate.
- Manukau Courier
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