Cromwell

The Cromwell treatment plant supplies water to Bannockburn, Cromwell, Lowburn, Ripponvale and the southern part of Pisa Moorings (shaded green on the map attached). The treatment consists of chlorination. This provides treatment for bacteria, but not protozoa.

The source water for Cromwell is drawn through bores from the Cromwell Terrace Aquifer. The bores are on the Clutha Mata-au arm of the lake, upstream of the Kawarau River confluence. As the bores are less than 30m deep they are not given secure aquifer status and require treatment for protozoa. The aquifer water has more consistent quality than a surface water source.

There is a project underway currently to upgrade how Cromwell Water is treated. Check out this page for current updates: Cromwell Water Treatment Upgrade - Central Otago District Council