Twenty-eight per cent of Whangārei District, or about 80,000ha, has been earmarked for SNAs, two-thirds of that in private ownership, it said.
"Approximately 55 per cent of the area identified as SNA is on private land with no formal protection, either by covenant, or district plan policy," WDC said in its submission.
"The proposed SNA affects over 10,000 rateable parcels that WDC will need to consult with landowners on as part of the District Plan change."
Roughly half of Whangārei's Māori land also has the new SNAs classification.
Huhana Lyndon, Ngā Hapu o Whangārei member, said this was not good news for Māori land which accounted for just 4 per cent of the district.
"Now we are being told with these new SNAs that half of this now tiny amount of land in the district will be restricted in its use," Lyndon said.
Whangārei Mayor Sheryl Mai said her council would not be considering the implementation of SNAs as part of its District Plan until the new government legislation on this was officially in place.
Finalising of the new National Policy Statement on Indigenous Biodiversity was due in October, but has been delayed and is now expected to be formally Gazetted later this year.
More than 10,000 rateable land parcels in Whangārei District have been classified with SNAs.
Meanwhile, huge public backlash against SNAs is building in the Far North after 8000 letters were sent to landowners showing up to 100 per cent of individual properties would now have the proposed new classifications.
Kawakawa farmer and SNAs opponent Kate Lowe has called on FNDC to stop work on the task.
But FNDC has said it will not be backing down, despite of calls from farmers, Māori and other landowners.
Darren Edwards FNDC manager strategic planning and policy, said FNDC was fulfilling its obligations under Northland Regional Council's regional policy statement.
"Other local authorities around the country have similar obligations and have already completed this task. This includes Lower Hutt City Council in 2018, Porirua City Council,
New Plymouth District Council and Waikato District Council. West Coast Regional Council is also currently identifying SNAs," Edwards said.
There are 10,748 Far North properties with proposed SNAs. Almost 20 per cent of these have the classifications across 80 per cent or more of their area.
About 52 per cent of the Far North's Māori land (60,306ha) has also been identified in the same way.
FNDC's SNAs work continues despite of the Government not yet finalising national legislation underpinning the new classifications.
"We hope that when the National Policy Statement for Indigenous Biodiversity is gazetted, it will provide a more enabling framework for all landowners, but especially the Far North's many Māori landowners, Edwards said.
"This policy was due to be Gazetted last October, before FNDC contacted landowners about SNAs. We anticipate the policy will be finalised this year. However, this is unlikely to change the need to identify and map New Zealand's unique landscapes, species and habitats," he said.
