Whau Valley Water Treatment Plant Project

  • Project typeDevelopment
  • Project value$27 million
  • Project scheduleScheduled for completion in June 2021
  • Contractor nameBroadspectrum (New Zealand) Limited
Whau Valley water treatment plant

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. 

The existing plant (which has been providing water to Whangārei for more than 60 years) will continue to operate until the new plant is up and running, after which a decision will be made about its future.


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.


270 Whau Valley Road, Whau Valley 0112  View Map

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