Christchurch drinking water is mainly drawn from aquifers deep underground. The Council has a network of wells, reservoirs, pipes and pump stations. It does regular testing and maintenance in line with the Drinking Water Standards for New Zealand(external link).
Water chlorination is the process of adding chlorine to the water supply to keep it safe from harmful bacteria. Sodium Hypochlorite is used in Christchurch.
Water from underground aquifers is used to supply the Christchurch urban area, Lyttelton, Diamond Harbour and Governors Bay..
Information about backflow prevention to stop accidental contamination of our water supply.
If you are building a house or garage it's worth checking your plans don't involve building over a Council water supply.