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Water treatment

Cleaner, safer water through world-class treatment facilities

Watercare operates 15 water treatment plants that supply drinking water to the Auckland region. 

Several plants were decommissioned at the end of 2014 following an upgrade of the Franklin water supply.

Water clarity is measured in nephelometric turbidity units (NTU). This measurement indicates the level of dirt particles within the water. Water from the dams in the Hunua and Waitakere ranges is sourced from protected catchments largely comprised of native bush, and therefore requires a lower level of treatment for it to meet Ministry of Health Drinking Water Standards for New Zealand.  Groundwater sources typically require even less treatment as the raw water is typically free from microbiological organisms and is of very low turbidity.

Because Auckland’s water comes from a wide variety of sources, a broad range of water treatment processes are used. Each treatment plant is designed to deal with the characteristics of its particular sources of raw water.