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I'm living in a highly populated area (at least by NZ standards) in Auckland, but the question goes for the whole country.

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See addition to my answer re MOH library water resources - superb - that should be reassuring :-). FWIW I and my parents family and my own family have always drunk NZ tapwater without concern throughout the country for many many many many decades, with no known ill consequences and a low level of personal & family illness. – Russell McMahon Dec 30 '13 at 23:55
@RussellMcMahon Thank you very much, Russel. – Roberto Dec 31 '13 at 0:43
up vote 13 down vote accepted

I'm living in a high populated area (at least for NZ's standard) in Auckland, but the question goes for the whole country.

Yes. Except in exceptional circumstances, NZ tapwater is universally safe to drink. Standards exist to ensure that major contaminating organisms such as Protozoa and Cryptosporidium are removed or reduced to safe levels.

Auckland water comes from two mains sources. West Auckland and some other parts of Auckland receive water from the Waitakere ranges catchment. Other areas receive water from the Hunua catchment and via pipeline from the Waikato river. The Waikato water is heavily contaminated at source and is treated to achieve requisite standards.

Auckland water is among the "softest" in NZ and better than most available in major cities internationally. eg whereas car batteries usually specify distilled water for topping up it is safe to use Ak tap water for this purpose.

There are variations between regions but these are mostly related to the nature of the water source. All NZ tap water is chlorinated.

About half of all NZ tapwater is fluoridated, with exceptions where local action has seen removal of fluoride from the water. Some consider fluoridation a negative measure with respect to health. The majority opinion sees it as a positive. The debate continues.

Drinking water standards for New Zealand:

The following document was found by following a series of links starting at the one provided by Mark Mayo in his answer. This is a 136 page PDF which provides extensive details.

NZ Ministry of Health - "Drinking-water Standards for New Zealand 2005 {Revised 2008} This is part of the NZ Ministry of Health online library.

NZ Ministry of Health library - water related items. A very large & useful resource:
140+ documents related to water with many of direct relevance to drinking water issues .

Only a few of the titles as a sample:

  • Resources for the drinking-water assistance programme - numerous papers, including:

    • Treatment options for small drinking-water supplies
    • Sustainable management of small drinking-water supplies : Optimisation of small drinking-water treatment systems
    • Sampling and monitoring for small drinking-water supplies Water safety planning for small community water supplies : step-by-step risk management guidance for drinking-water supplies in small communities.
  • Annual report on drinking-water quality
    Estimation of the burden of water-borne disease in New Zealand
    International standards for drinking-water
    Guidelines for drinking-water quality (World Health Organization.)
    Development of drinking-water standards for New Zealand
    Drinking-Water standards for New Zealand 1995
    Drinking-Water standards for New Zealand
    Guidelines for drinking-water quality : first addendum to third edition
    Drinking water quality : problems and solutions (Gray, N. F.)
    Provisional microbiological water quality guidelines for recreational and shellfish-gathering waters in New Zealand
    Community water fluoridation
    Cost benefit analysis of raising the quality of New Zealand networked drinking water
    Draft protocols for the public health grading of drinking-water supplies
    Pathogens and pathways, and small drinking-water supplies
    And many more ......


NZ water chlorination code of practice

Ministry of health notes on Protozoa and Cryptosporidium removal from tapwater


NZ Ministry of Health fluoridation page

Source Wikipedia

  • The use of water fluoridation first began in New Zealand in Hastings in 1954. A Commission of Inquiry was held in 1957 and then its use rapidly expanded in the mid 1960s.[96] New Zealand now has fluoridated water supplied to about half of the total population.[97] Of the six main centres only Christchurch[98] and Tauranga[99] do not to have a fluoridated water supply. In 2013 a Hamilton City Council committee voted to remove fluoride from late June 2013.[100] A referendum was held during the council elections in October 2013 with approximately 70% of voters voting for fluoride to be added back into the water supply. The mayor and most councilors have indicated that they will support the outcome of the referendum.[101] In a 2007 referendum about half of voters in the Central Otago, South Otago and the Southland Region did not want fluoridation[102] and voters in the Waitaki District were against water fluoridation for all Wards.[103] Ashburton and Greymouth also voted against fluoridation.[104]

NZ anti-fluoridation campaign

NZ national newspaper discussion on Fluoridation

USA EPA comment

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Tap water, yes, certainly. NZ has well-defined, strict standards about drinking water.

There was a brief period of concern recently post-earthquake in Christchurch, where the aquifers and supply line got damaged, but that has since been restored.

So short answer: yes, and longer answer: yes, except sometimes immediately after unforeseen disasters.

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Mark - I followed your Ministry for the environment link and after some more wandering arrived at the superb Ministry of Health library and subset it to water related papers. Too good not to add to my answer - I've noted that you provided the initial link. – Russell McMahon Dec 30 '13 at 23:58

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