Christchurch Wastewater Treatment Plant update

Tuesday 7 April 

Pond health and odour

Overall pond conditions remain stable this week, with monitoring confirming the system is continuing to perform well as we move firmly into winter mode.

Staff are observing ongoing changes in pond colour across the ponds. These are expected seasonal shifts that typically occur as daylight hours shorten and biological activity naturally slows, rather than any sign of declining pond health.

Recent overcast conditions have contributed to some short‑term variability in dissolved oxygen levels, which is normal at this time of year. The ponds remain well within expected operating ranges and continue to function as intended under winter conditions.

Community odour monitoring continues to record low levels of hydrogen sulphide, which is consistent with the generally stable conditions being observed across the system.

As winter conditions become more established, day‑to‑day conditions can still fluctuate. This may include brief changes in oxygen levels and biological performance.

Our team will continue close monitoring and respond as needed to maintain stable operation.

A word from Gary 

Over the past couple of weeks, I’ve had limited attendance at my drop‑in sessions at the Bromley Community Centre, so I won’t be continuing these for now. Instead, I’ll be basing myself out of the Council staff offices at the Christchurch Wastewater Treatment Plant.

I’m still very keen to catch up with anyone who would like a chat. The best way to do this is to get in touch directly so we can arrange a time that suits. I’m happy to meet you at your place, or somewhere nearby. I want to make sure the way I work reflects what the community actually needs, and it’s clear the drop‑in sessions aren’t quite the right fit at the moment.

This afternoon I’ll be giving the Community Board an update on recent work and sharing some of what I’ve been hearing from the community. The 4pm meeting will be livestreamed on the Board’s YouTube channel, with a recording available afterwards.

If you’d like to get in touch, you can call or text me on 027 239 6317, or email gary.watson@ccc.govt.nz.

Work programme for aerator installation being finalised 

Following the recent decision to increase aeration at the wastewater treatment plant to help reduce odour, our teams are now busy working on the roll-out plan.

 We expect to be able to share a work programme with more detailed timeframes and next steps in the near future, and will provide a further update once this information is finalised.

Stay updated

We want everyone to be able to stay updated on what's happening at the Christchurch Wastewater Treatment Plant, and we regularly post new information on ccc.govt.nz/wastewaterfire 

You're welcome to send this update to your networks. If you know someone in the community who doesn’t have email or internet access, please print this newsletter off and pass it to them.

If you know of anyone who would like to receive this e-newsletter they can subscribe online. 

If you have any questions, or would like further information on the project, please call us on 03 941 8999 or 0800 800 169 or email wastewater@ccc.govt.nz  

Thanks for your patience and understanding. We’ll be in touch again soon.