Upgrading the wastewater pipes

KO278 FS Bothamley Park Wastewater Pipes v2a Page 1

The Bothamley Park wastewater pipes runs along the length of Bothamley Park and collects wastewater from Ascot Park, Aotea, Waitangirua, Cannons Creek, and Rānui.

Image of Bothamley Park wastewater pipe and it's sewage catchment


The majority of the pipe was built and installed in the 1950s and 1960s. It takes raw sewage from eastern Porirua and parts of Aotea to the wastewater treatment plant in Titahi Bay.

When it rains, stormwater gets into the wastewater pipes. When this happens, untreated sewage overflows from manholes and runs into our waterways. It is estimated that 40,000m3 of untreated wastewater overflows into Kenepuru Stream in a typical year. That’s enough to fill 16 Olympic swimming pools!

Untreated wastewater getting into the stream poses a risk to our health, kills fish and other life in the stream, and prevents locals from collecting healthy kai moana (seafood).  As more houses are built in the area, it puts even more pressure on Bothamley Park’s wastewater pipe network and results in more overflows of untreated sewage. 


The opportunities

Investigation from a range of partners, local government and government agencies has identified three opportunities to help to fix our wastewater problems:  

1. Upgrade the Bothamley Park wastewater pipe with a newer, larger pipe. This will be installed along a similar route as existing pipes and where possible, we will lay the pipe underground, rather than across the Kenepuru Stream.


2. Build a large wastewater storage tank just north of the Porirua Station carpark. Wastewater will overflow into this tank when there is not enough capacity in the wastewater network downstream, to reduce overflowing into Kenepuru Stream. 


3. Renew old, leaky pipes within eastern Porirua to reduce the amount of stormwater that gets into the wastewater pipe.  


Together, these three improvements are designed to significantly reduce overflows of untreated sewage into waterways in eastern Porirua.  



August - September 2021 - Consult with community about new wastewater pipes.

September - October 2021 - Finalise draft design for wastewater pipes.

November 2021 - Share design and plans with community and invite feedback.

November 2021 - early 2022 - Finalise design of wastewater pipes.

Early - mid 2022 - Apply for resource consent.

Late 2022 - early 2023 Start construction.


Frequently asked questions

To help answer some questions you may have about the upgrade to Bothamely Park's wastewater pipes, click here to view the FAQs. You can also view and download a summary of this page here.

Still have questions? Reach out:



• Visit us at our Community Info Hub, 26 Warspite Ave. We're open from Alert Level 1, every Tuesday - Thursday, 1.00 pm - 4.00 pm.


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