Skip to main content

State of local emergency (1)

For up to date information and advice, visit Taranaki Emergency Management

For urgent flooding issues (buildings and infrastructure) phone 06 759 6060 or report a problem online.

For information on disruptions to our sites and facilities please, visit Public Notices.

Our treatment plants
Te Pūnaha Maimoatanga Wai o Ōākura

Okato Water Treatment Plant

Source of water
Mangatete Stream.

Present capacity
50,000L/hr.

Treatment

  • Bank infiltration gallery
  • Cartridge filtration
  • Ultraviolet disinfection
  • Disinfection (chlorination)
  • pH adjustment (lime)

The water treatment process

Water from the Mangatete Stream is drawn through an infiltration gallery under the riverbank and flows by gravity to the treatment plant where the following multi-barrier process occurs:

Two-stage microfiltration – two banks of cartridge filters operate in parallel to remove fine particles and protozoa oocyst (e.g. giardia).   The first bank of cartridges is 1 um nominal and the second bank is 1 um absolute

Ultra-violet sterilisation unit – acts as an additional barrier against protozoa contamination.

pH adjustment is used to reduce the corrosive potential of the water to plumbing.

Chlorine addition for disinfection – to ensure there are no microorganisms present in the water distributed to the reservoir.

The water is then transferred to the 1.2 million litre capacity reservoir.

The supply zone extends from Oxford and Saunders roads to Hampton and Brophy roads and includes the Okato township. These rural properties supplied are either metered or have a restricted flow connection. 

Page last updated: 03:41pm Thu 21 October 2021

Contact us
06 759 6060 enquiries@npdc.govt.nz
Visit us

84 Liardet Street
New Plymouth

Search
Find by A–Z
Navigate
Useful links
Our NPDC family
New Zealand Government logo