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).
Monitoring of midges at the Christchurch wastewater treatment plant is underway as temperatures start to rise for summer.
21 Oct 2025
Christchurch has one of the last city Council water testing laboratories in the country, with technicians working 365 days a year to ensure the quality and safety of our water.
15 Oct 2025
Three new water tanks will help fight fires in rural Banks Peninsula.
9 Oct 2025Request, report and pay for Council services.
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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