Water Supply - supplying safe drinking water to the region

by Charlotte,

We own around $406 million worth of water supply assets, and provide wholesale drinking water to the four city councils in our region (Upper Hutt, Porirua, Hutt City and Wellington). This is managed on our behalf by Wellington Water.

We are also responsible for the treatment of the water supplied for distribution. Safe drinking water is vital, and we work with other councils and our communities to ensure that in the event of an emergency, people in our region have access to clean, drinkable water as quickly as possible.

Key issues for us are making sure we can restore water supply quickly following an emergency and that water is safe to drink. The Kaikōura earthquake and water quality issues in Havelock North recently highlight the importance of these responsibilities.

Our key programmes of work are outlined below. These were all included in our previous 10-Year Plan. We will need to make decisions regarding additional water sources and a more secure supply for Wellington in the future. These decisions are explained in Future Decisions on page 15.

Ngauranga Reservoir seismic strengthening

This work will make the Ngauranga Reservoir, in Khandallah, more able to withstand earthquakes. We anticipate this will cost approximately $3.8 million and be undertaken in the 2018/19 year.

Prince of Wales/Omaroro Reservoir

The Prince of Wales/Omāroro Reservoir will provide potable water to approximately 70,000 residents and commercial businesses, and the Wellington Regional Hospital. The reservoir will provide water supply after a major event and extra capacity to cope with population and business growth. It will be funded primarily by the Wellington City Council, but Greater Wellington will contribute $5.6 million to the work starting in the 2021/22 year.

Replace Kaitoke water main on Silverstream Bridge

We’re strengthening the water main from Te Marua to reduce the impact of an earthquake on the water supply to Porirua. The cost of this work is approximately $19 million and is scheduled to begin in the 2018/19 year.

This work impacts the water levy we charge to the four cities in our region. The water levy is on-charged through city council rates.

Overall for this area the level of service is proposed to be improved over the 10 years of the plan.

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