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Treating water sourced from bores, springs and rivers

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

To meet the New Zealand Drinking Water Standards 2005 (revised 2008), most raw water needs to be treated. The treatment process removes suspended solids, turbidity (dirt particles) and harmful microbiological organisms. The exact level of treatment required depends on the source of the water.  

Location

Source

Treatment

Capacity in litres per day

Muriwai

Groundwater – spring

Cartridge filtration, pH control, chlorination, UV disinfection

480,000

Hamiltons Road (Algies Bay/Snells Beach)

Groundwater – bore

pH control, chlorination

1,800,000

Wellsford

Hoteo River

Sedimentation, sand filtration, pH control, chlorination

1,440,000

Warkworth

Mahurangi River

Coagulation, clarification, PAC dosing (optional), sand filtration, pH control, chlorination

2,800,000

Helensville

Mangakura Stream

Dams and sandhills

Spring fed wetland on Ohirangi Stream

Coagulation, clarification, PAC dosing (optional), sand filtration, pH control, chlorination

1,000,000

Waiuku

Groundwater – 3 bores (each with their own water treatment plant)

Chlorination, UV disinfection

1,933,000

Bombay

Groundwater – spring

Cartridge filtration, pH correction, chlorination, UV disinfection

157,000

​Onehunga

​Groundwater - 2 wells

​Coagulation, sand filtration, chlorination and pH control. Fluoride is added to water supplied to the metropolitan area, outside of the Onehunga zone.

​24,000,000

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