Whau Valley Water Treatment Plant Project

  • Project typeDevelopment
  • Project value$29 million
  • Project scheduleScheduled for completion in December 2021
  • Contractor nameVentia
Whau Valley water treatment plant

The treatment plant began producing water for the network at the end of May 2021 and the old treatment plant was shut down.

A decision has yet to be made about the future of the old water treatment plant and it may become a treated water storage facility in the future.

The new Whau Valley Water Treatment Plant will secure Whangārei's urban water supply for decades to come. The new plant will treat raw water from the existing Whau Valley Dam and the Hatea River, increasing the capacity of Whangārei water supply from 15,000 cubic metres processed each day by the existing plant, to 22,000 cubic metres a day. It will involve new filtration systems and use the latest technology. 

The new Whau Valley Water Treatment Plant will be modern, future-proofed, more robust and will provide greater resilience when it comes to water security. This is especially important considering the growth in our District, and the increased climate challenges.  

Future-proofing our drinking water system is one of the most important things we can do as a Council, and the new plant will provide this for decades to come. 

Storm water to clean water

The plant will able to turn brown, silty, dam water into pure drinking water much faster during major storms.

As rain and floodwaters rush down from the hills into the dam they bring all sorts of sediment and debris with them, churning up the dam and turning the water brown and opaque. Water in that condition is more difficult to process than the usual, fairly clear, water taken from the dam.

In usual conditions the existing plant can process 15,000 cubic metres of water a day, but the new plant is designed to process 22,000 cubic metres a day and handle poorer quality water.

Location

270 Whau Valley Road, Whau Valley 0112  View Map

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