Christchurch has an unchlorinated, underground aquifer fed water supply, but from time to time chlorine may be added.

Water chlorination is the process of adding chlorine (Sodium Hypochlorite in Christchurch) to the water supply to keep it safe from harmful bacteria. It can be added as a precaution after routine work, such as reservoir cleaning, or as a result of finding bacteria in the water supply during routine water sampling.

Chlorine may be noticed by its distinctive smell or taste, but in most cases these effects are diluted relatively quickly as the chlorinated water is mixed with fresh unchlorinated water.

The Christchurch water supply is made up of several zones that are operated independently of each other:

Brooklands / Kainga

No chlorination at this time

No chlorination at this time

Central

No chlorination at this time

No chlorination at this time.

Ferrymead

No chlorination at this time

No chlorination at this time.

Hills

No chlorination at this time

No chlorination at this time.

Northwest

No chlorination at this time

No chlorination at this time.

Parklands

No chlorination at this time

No chlorination at this time.

Riccarton

No chlorination at this time

No chlorination at this time.

Rocky

No chlorination at this time

No chlorination at this time

West

Chlorination of Halswell water reservoir.

Affected zone

14 November 2016: Chlorination of Halswell 2 water reservoir in Kennedys Bush Road as part of the repair work on broken water mains.

Chlorination was completed as an extra precaution and the effects (taste and smell) should dissipate over the next two days.