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).
All but one of Christchurch city’s water treatment plants are now fully compliant with national protozoa drinking water rules and standards.
22 May 2025Christchurch City Council is proceeding with its current resource consent application to establish and operate an Akaroa wastewater treatment scheme that irrigates to land.
14 May 2025Christchurch City Council’s innovative approach to stormwater management has earned national recognition.
7 May 2025Request, report and pay for Council services.
Apply for building and resource consents.
Manage your library borrowing.
Receive your rates invoice by email.
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.
Take full control of your Rec and Sport membership.
List your events on What’s On Christchurch