Drinking Water for New Zealand

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

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An information source for the public, and those managing New Zealand drinking-water quality.
Note: The information in this website is out of date. No updates have loaded since 1 November 2021. For more information on suppliers contact Taumata Arowai.
Find a supplyIndividual Water Supplies

Click this map of New Zealand to find your supply and its compliance with the standards.

or Search:

Example: Entering akar will find both Akaroa and Paekakariki.

See also: Fluoridated supplies map

NZ ProcessesNew Zealand Processes

Click the tap for knowledge on NZ drinking-water supplies, who looks after them and what processes are in place to ensure clean, safe water.

About this Website

Use this website to see public information about the following aspects of drinking water supplies in New Zealand:

  • All networked supplies serving 25 people or more.
  • Compliance with the Standards for supplies using the latest official data publicly released in a finalised Annual Review.
  • All currently registered water carriers (tankered supplies).
  • All laboratories that are recognised by the Ministry of Health as suitable for monitoring water samples.

There are also links to Ministry of Health documents and other information that may be useful regarding drinking water in New Zealand.

Note that self supplies are no longer included in the drinking water database and hence no longer appear on these pages.

Site Statistics, using National DWO data to 2 Nov 2021.
Water supplies 684
Distribution zones within supplies 907
Treatment plants 814
Water sources 1,162
The 684 supplies include ...: Count Population
Networked supplies 675 4,263,077
Bulk supplies 1 350,000
RADWS supplies 8 1,058

Notes on the Table:

  • Bulk supplies serve water to network supplies, so their population should not be counted twice.
  • RADWS means "rural agricultural drinking-water supply.'
  • Self supplies are not included in the database or this website.
Drinking Water Database for New Zealand

The former "Water Information New Zealand" (WINZ) database was progressively replaced by "Drinking Water Online" (DWO) from July 2017 onwards.

DWO is a web-based system accessible by all networked water suppliers and district health boards.

From March 2018, this website uses DWO data, which will again be updated weekly.

See more about DWO here.

Water Carriers

See all water carriers currently registered for providing drinking-water by tanker.

Find a Laboratory

All Ministry of Health Recognised Laboratories suitable for drinking-water analysis, along with all the tests for which they are specifically registered.

Ministry of Health Official Documents

Use our list of Key Documents or go directly to the drinking water section of the Ministry of Health website.

Contact Us   

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