Temporary repairs are being undertaken and an investigation into the cause of the burst pipe is underway.
When asked if there were concerns with the state of Auckland's pipes, Bourne said they were investing in the infrastructure.
Safeswim has issued a long-term no-swimming warning near the Wairau Creek outlet due to its "high risk" and has further advised people not to swim on Milford Beach.
Beachgoers are still swimming at Milford beach after the sewage leak. Photo / Michael Craig
Watercare has a large wastewater pump station on Alma Rd, where wastewater was pumped towards the Rosedale Wastewater Treatment Plant.