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Water treatment plants

Once the water has been collected at the intakes from the rivers, or is drawn from the aquifer, it enters a treatment plant.

Wellington

There are four treatment plants in Wellington (Te Mārua, Wainuiomata, Waterloo, and Gear Island), 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 2018). Our treatment methods are designed to produce water that meets these standards and satisfies the needs of our customers.

For an overview of the performance, including regulatory compliance, of Wellington's Water Treatment Plants, you can view our monthly summary report (181KB PDF) (August 2024). 

Te Mārua Water Treatment Plant

Wainuiomata Water Treatment Plant

Waterloo Water Treatment Plant

Gear Island Water Treatment Plant

Waiwhetu Aquifer - Chlorination

South Wairarapa

All drinking water supplied to South Wairarapa is now treated using UV and Chlorine, and some treatment plants also include pH correction and Ozone treatment.

There are four treatment plants in South Wairarapa (Waiohine, Memorial Park, Martinborough, and Pirinoa) and they are owned by South Wairarapa District Council.

It's worth noting that the Martinborough Water Treatment Plant has an additional manganese reduction plant that allows the water supply to be treated with chlorine without causing water discolouration.  

For an overview of the performance, including regulatory compliance, of South Wairarapa's Water Treatment Plants, you can view our monthly summary report (69KB PDF) (August 2024). 

Waiohine Water Treatment Plant

Memorial Park Water Treatment Plant

Martinborough Water Treatment Plant

Manganese Reduction Plant

Pirinoa Water Treatment Plant