How is it treated?
Once the water has been collected at the intakes from the rivers, or is drawn from the aquifer, it enters a treatment plant.
There are four treatment plants around the region and they are owned by Greater Wellington Regional Council.
The Ministry of Health has established guidelines for safe drinking water: the Drinking Water Standards for New Zealand 2005 (revised 2008). Our treatment methods are designed to produce water that meets these standards and satisfies the needs of our customers.
Once the water has gone through the treatment process it is distributed along the drinking water network
Wellington Water hosts a number of group tours throughout the year of the treatment plants. If you are interested in having a group tour, please email firstname.lastname@example.org.
The Wainuiomata water treatment plant receives water from the Wainuiomata and Orongorongo rivers and three smaller creeks (Georges, Big Huia, and Little Huia). The plant's design capacity is 60 million litres per day (ML/d), but production is typically around 30 ML/d or just under 20 percent of total supply each year. Read more
Greater Wellington Regional Council has approved the permanent chlorination of Lower Hutt drinking water. The Council voted in favour of a recommendation from Wellington Water, based on our Waterloo Wellfield Water Quality Contamination Investigations Report. Read more