Auckland’s Biosolids Challenge and Puketutu Island Rehabilitation w/ Andrew Deutschle: 2 June, 2026

The Mangere Wastewater Treatment Plant is Auckland’s largest, dealing with over 70% of Auckland’s wastewater. Biosolids, the byproducts of this treatment process, are currently transported to the neighbouring Puketutu Island as part of a project to rehabilitate it. However, by 2035, the Puketutu Island Rehabilitation Project will be phased out, and a new strategy will be needed to deal with Auckland's biosolids. 

Wire producer Liam spoke with Andrew Deutschle, head of wastewater planning at Watercare, about what Auckland’s wastewater system looks like, the challenge and potential solutions we are facing with our biosolids, and how Aucklanders can be involved and provide feedback in this process.