Drinking Water Testing

The tests shall be carried out by an IANZ accredited laboratory, accredited for the specific tests required.

Below are the chemical parameters and detection limits required to be tested for to assess the potability of water for drinking. In order to assess the values recorded against the Maximum Acceptable Values (MAVs) or Guideline Values (GVs), refer to the latest version of the Drinking-water Standards for New Zealand.

TestDetection Limit
Total (NP) Organic Carbon0.5g/m3
Alkalinity - Total1 g CaCO3/m3
Conductivity at 25 ⁰C0.1 mS/m
Total Dissolved Solids2 g /m3
Saturation Index-
Bicarbonate1 g CaCO3/m3
Carbonate1 g CaCO3/m3
Free CO21 g CO2/m3
Turbidity0.05 NTU
Flouride0.02 g/m3
Chloride0.02 g/m3
Nitrate - Nitrogen0.05 g/m3
Sulphate0.02 g/m3
Ammonia Nitrogen0.01 g/m3
Silica0.02 g/m3
Total Phosphorus0.005 g/m3
Arsenic0.0011 g/m3
Boron 0.03 g/m3
Calcium 0.1 g/m3
Iron 0.021 g/m3
Magnesium0.021 g/m3
Manganese 0.00053 g/m3
Potassium 0.05 g/m3
Sodium 0.021 g/m3
Zinc0.002 g/m3
Total Hardness1 g CaCO3/m3
Calcium Hardness1 g CaCO3/m3
Total Coliforms1 MPN/100mL
E. coli1 MPN/100mL