Projects / Naenae Reservoir Repairs

Naenae Reservoir Repairs

Current status

On behalf of Hutt City Council we are undertaking maintenance and repair work on the Naenae Reservoir to improve the drinking water network’s performance, and reduce the risk of emergency repairs.

Start Date
End Date

If you have any questions about this work, please contact:

Wellington Water, 04 912 4400

What we're doing

We are currently undertaking repair work. The reservoir is a partially buried so repairs involve the removal of vegetation and excavation of the reservoir walls to around 4-5m depth.

Once earthworks are completed, native planting will be undertaken around the reservoir to replace those removed. 

This work will begin in October 2022 and is estimated to be completed by the end of March 2023.

Hours of work will generally be 8am to 5pm, Monday to Friday. 

Construction traffic will use the firebreak access road to access the reservoir, however walking and cycling access along the firebreak route will be maintained throughout the project.



Naenae Reservoir is the largest reservoir in the Hutt City Council zone. It was a fully buried concrete reservoir built in 1946. It has a long history of contamination events and in April 2019 a water quality sample taken from the reservoir returned a positive E. coli result. Subsequent inspections have identified that water can pond on the roof and there are potential leakage paths. There is also evidence of leakage through repaired cracks in the walls that have started leaking again.




  • Reduce the risk of microbiological contamination of water in the reservoir
  • Improve the council's drinking water infrastructure and build network resilience for 76,000 Lower Hutt residents