Councils in Northland and Auckland have published their rules and guidelines on marine discharges and created a convenient phone app so that you can easily check if you are in a location where you can discharge wastewater. You can get instructions on how to download and use this app here on the Northland Regional Council website.
If you are boating in either of these regions, please check you have a good understanding of the rules on the relevant council websites:
Marine discharges in Northland
Boat sewage discharges in Auckland