Drinking Water for New Zealand

Managed by ESR for the Ministry of Health.         Data extracted from the National DWO Database.

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Water Supplies

Officially Assigned Priority 2 Determinands

Treatment Plants for Nitrate (as NO3)

4 treatment plants supplying 42,048 people in 4 drinking-water zones within 4 supplies.

1.0% of the 4,221,291 people in New Zealand on networked or specified self supplies receive this water.

Supplies connected to these Plants are shown. Click one to see its plants as part of its structure.



P2 Supply Zones Zone Population Supply Pop*
NO3 Ashburton 1 19,000 19,000
NO3 Darfield 1 3,720 3,720
NO3 Rolleston 1 18,550 18,550


P2 Supply Zones Zone Population Supply Pop*
NO3 Lower Waitaki, Rural 1 778 778

Source: Drinking Water Online, as extracted from the National DWO database on 13 Oct 2021.


If supply and zone populations differ, then additional zones within this supply are receiving water from plants that don't have this Priority 2 determinand assigned. Refer to the individual supply structure page to see which zones are affected.



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