Authorities were earlier warned of angry trout anglers threatening to release pest fish.
Half of Northlanders rely on rainwater tanks, more than three times the national average.
The public is being asked for feedback.
'Research has already shown people will be facing significant increases.'
Cost of Kaitaia's water resilience from Sweetwater bore soars
Northlanders fear their water needs would get lost among those of Auckland's residents.
Northland pest control continues during Covid 19 lockdown
Far North District Council hopes to tap into water storage funding
Whangārei residents have cut their water use by 2 per cent since Monday.
Māori urged to get behind Northland infrastructure projects.