Water quality

Safe and reliable drinking water is vital to the health and prosperity of our region and its people. We are responsible for making sure that the water supplied to Lower Hutt, Porirua, Upper Hutt and Wellington is clean and safe to drink.

Water from our rivers and aquifers (natural underground reservoirs) can contain microbiological material and a variety of naturally occurring chemical elements, some of which can cause health problems.

We monitor the water supply to make sure that there are no bacteria, viruses or protozoa (such as cryptosporidium and giardia) present following our treatment processes, as they can cause water-borne disease. We also monitor the concentrations of a range of chemicals in our water, to ensure that there are no metals or other chemicals at levels that are considered unsafe.

The criteria for determining whether a water supply is safe are contained in the Ministry of Health's Drinking Water Standards for New Zealand. Our monitoring and testing of the water supply is designed to prove that we meet these standards.