Council closely monitoring lower Waihao Water Scheme

UPDATE: 6 November

We are currently sitting at 39mg/L and appear to be holding at this level. The impact of the recent rain event was less than anticipated and we will continue to both monitor and advance the work associated with future denitrification.

UPDATE 25 October 4pm

The Waimate District Council wishes to inform residents that nitrate levels in the Lower Waihao Rural Water Scheme are holding steady at 40mg/l with no change since our last advice.

Domestic self-suppliers are advised to get their water tested.

24 October: The Waimate District Council wishes to inform residents that nitrate levels in the Lower Waihao Rural Water Scheme are currently elevated at 40mg/l.

These levels have risen following a recent rainfall event after a prolonged dry period, and with more rain expected this Labour Weekend, the levels may increase further.

Council is closely monitoring the situation, with daily checks of the nitrate levels in place. Should the situation worsen, the Council will provide updates to residents through its new notification service, NotifyMe, as well as via Facebook and the Council’s website.

By signing up here, subscribers can opt in to receive timely text and email alerts.

It is important to reassure the community that the water remains safe to drink and is compliant with the Drinking Water Standards for New Zealand, which set a maximum acceptable level of 50mg/l for nitrates.

Nitrate is a water-soluble molecule made of nitrogen and oxygen. It is naturally found in plants and many foods and is tasteless and odourless. Consequently, it is naturally occurring in the environment, but also can enter the environment by other pathways including, but not limited to, chemical fertilisers and various land uses.

Council has been actively reviewing denitrification plant solutions, but the process has been complex, involving challenges around discharge options, consent processes, and significant operational costs. This is an ongoing process, with new options currently being investigated.

Council understands the concern surrounding nitrate levels in the drinking water and is working closely with its engineering specialists towards a long-term solution.

For more information on nitrates and their impact on water, please visit here.