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Wastewater overflow

Find out the current wastewater overflow into the Buller and Orowaiti River with our live dashboards below. This information is provided to inform recreational users and other parties of wastewater overflow that can enter these two rivers. 

Wastewater overflow dahboard

The dashboard below provides information on whether a wastewater overflow occurred, the date and time of the most recent overflow, and the duration of the overflow. 

Please select a pump station from the drop-own list. You can find the locations of these in the map below.

For more details on water quality for recreational use, please visit the Land Air Water Aotearoa website.

Why does wastewater overflow into the Buller and Orowaiti river?

Wastewater from Westport and Carters Beach is treated in a wastewater treatment plant using an aerobic process to treat raw wastewater before the treated wastewater is discharged into the Buller and Orowaiti River.

A key issue that Council is currently addressing is the mixing of wastewater and stormwater, which is an inherited historic problem in some parts of Westport. Before the Westport Wastewater Treatment Plant was established, wastewater and stormwater were often discharged to the same pipe. This is called a private cross-connection and allows stormwater to enter the wastewater network. 

During dry weather, Westport's wastewater network and treatment plant operate efficiently and can cope with the volume of wastewater.  

However, during medium and heavy rainfall events, the wastewater system is overwhelmed by stormwater through these cross connections. The treatment plant can not cope with this large volume of mixed stormwater and wastewater and it overflows into the Buller and Orowaiti Rivers. These overflows are displayed on this page.

Currently, Council is renewing its resource consent with the West Coast Regional Council (WCRC) for Westport’s combined wastewater and stormwater overflows into the Buller River. Under the Resource Management Act, Council must have a resource consent to discharge treated wastewater into any river or other water body.  

As part of the renewal process, WCRC requires Council to address the issue of these private cross-connections to reduce the frequency and volume of wastewater overflows into these two river systems.

Westport pump stations

You can view the locations of the Westport pump stations on the map below.