Working towards safe drinking water for everyone

Safe Drinking Water from the tap. Safe drinking water – available to everyone – is a fundamental requirement for public health. Drinking water can contain harmful germs such as Cryptosporidium, Giardia, Campylobacter, Salmonella and E. coli O157 that can cause serious illness.

Community and Public Health works on behalf of the Ministry of Health to facilitate improvement in the quality of community drinking water supplies throughout Canterbury, South Canterbury and the West Coast. Staff encourage the protection of drinking water sources and improvements in water quality through the following actions:

Download or read frequently asked questions (FAQ) sheet:

Read the 2011 CDHB Position Statement on the Canterbury Water Management Strategy [124kB PDF].

Read the 2003 CDHB Position Statement on Water Fluoridation [113kB PDF].

Water restrictions now in place in some areas

The demand for water in summer can double or even triple. This can mean that those on the local reticulated supply are using water faster than it can be pumped or reservoirs can be filled – leading to supply issues and reduced pressure. Reduced pressure is worrying as it can impact the effectiveness of activities like fire-fighting.

We all need to do our bit to conserve water to stop further water restrictions.

Check out your local council’s website for any water restrictions currently in place, as well as water saving tips.

Health risks of nitrates in drinking water from private bores

High levels of nitrate in drinking water may pose a significant health risk for the foetus of pregnant women and formula-fed infants through using drinking water.

Regional councils monitor the nitrate levels in groundwater around their region. Environment Canterbury creates and updates maps showing the nitrate levels across Canterbury.

  • Green areas are where nitrate concentrations in groundwater are always below the Maximum Acceptable Value (MAV).
  • Red areas are where nitrate concentrations in groundwater are above the MAV most or all of the time and therefore alternative water sources should be used for drinking.
  • Yellow areas are where it is not known if a sample collected from a well will have nitrate concentrations exceeding the MAV and testing is recommended.

Get your water tested if you live in a yellow nitrate area

It is important to get your water tested for nitrates if you are pregnant, or have a formula fed baby under 6 months and are on a private bore or well in a ‘yellow’ area. Testing is the only way to detect nitrate as it is tasteless, odourless and colourless.

There are several laboratories that are able to test for nitrate. Often the laboratory will be able to provide you with a suitable bottle and instructions for taking the sample yourself. The result may take a few days.

Documents and Forms for Water Suppliers

Downloads

Download or order resources from the Community Health Information Centre.

Links

Contact a Drinking Water Assessor for more information:

CANTERBURY
Ph: +64 3 364 1777
Fax: +64 3 379 6125

SOUTH CANTERBURY
Ph: +64 3 687 2600
Fax: +64 688 6091

Contact the Drinking Water Assistance Programme Facilitator:

Kathryn Russell
Ph: +64 3 378 6811
Fax: +64 3 379 6125

Maps of Nitrate Risk in Canterbury Drinking Water

Environment Canterbury creates maps of nitrate risk for the water zones across Canterbury. These maps are current as at December 2017.

Download or view the map to find out the nitrate risk from private wells or bores in your region or area.

What to do if your area is under a boil water notice

A range of hazards and emergencies may contaminate your water supply and make it unsafe to drink or use. A boil water notice will be issued when this happens.

People living in the affected area should boil all water until further notice for:

  • drinking;
  • making up infant formula;
  • preparing food; and
  • cleaning teeth.

Find out more about boiling water and hand hygiene when your water is contaminated (Ministry of Health).

Getting the facts on fluoride

The Ministry of Health strongly supports water fluoridation as a safe, effective and affordable way to prevent and reduce tooth decay across the whole population. Most tooth decay is preventable, and water fluoridation is a simple way to prevent it.

The most recent nationwide New Zealand survey into oral health showed 40 percent less tooth decay on average for children living in fluoridated areas compared with non-fluoridated areas.

The NZ levels of fluoride used in community water fluoridation are carefully monitored and within the guidelines of the World Health Organization and other public health agencies.

Page last updated: 24/01/2020

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