A typical analysis of the chemical makeup of Christchurch water, prior to temporary chlorination.
There are 38 routine chemical tests carried out on Christchurch water with 22 of these tests establishing the presence of specific chemicals and to measure they are below acceptable limits.
Chemical | Measure |
---|---|
pH | 7.8 |
pH after aeration | 8.2 |
Acidity to pH 8.3 (as CO3) | 1 g/m³ |
Total alkalinity to pH 4.5 as HCO3 | 52 g/m³ |
Turbidity (NTU) | Less than 1 |
Nitrate Nitrogen | 1 g/m³ |
Sulphate | 5.0 g/m³ |
Chloride | 5.0 g/m³ |
Calcium | 12.0 g/m³ |
Fluoride | Less than 0.1 g/m³ |
Magnesium | 1.5 g/m³ |
Potassium | 1 g/m³ |
Sodium | 6.1 g/m³ |
Reactive silica (as SO2) | 16.0 g/m³ |
Total hardness (as CaCO3) | 45 g/m³ |
Conductivity at 20°C (mS/m) | 10 |
Note: Grams per cubic metre (g/m³) is equivalent to milligrams per litre (mg/l).
Canterbury Regional Council (Environment Canterbury) has developed a predictive model that will give swimmers and other harbour users real-time information about water quality at popular sites around Whakaraupō Lyttelton and Akaroa harbours.
23 Sep 2025Street renewal and traffic calming works on Flockton Street have been timed to follow wastewater upgrades.
22 Sep 2025Here are the key decisions from the Wednesday 3 September Council meeting.
3 Sep 2025Request, report and pay for Council services.
Apply for building and resource consents.
Manage your library borrowing.
Receive your rates invoice by email.
Book an indoor or outdoor space.
Take full control of your Rec and Sport membership.
List your events on What’s On Christchurch
Request, report and pay for Council services.
Apply for building and resource consents.
Manage your library borrowing.
Receive your rates invoice by email.
Book an indoor or outdoor space.
Take full control of your Rec and Sport membership.
List your events on What’s On Christchurch