Drinking Water Standards

Drinking Water Standards Compliance

New Plymouth District Council is committed to providing safe drinking water and achieving compliance with the requirements of Drinking Water Standards for New Zealand 2005 (amended 2008), within the time frames required by the Ministry of Health.

In order to have safe drinking water and comply with the Drinking Water Standards, the Council has developed and implemented water supply safety plans for each water supply. Compliance with these plans are assessed by the MoH Drinking Water Assessor on a quarterly basis.  

The MoH Drinking Water Assessor for Taranaki has recently confirmed that the Council's drinking water supplies are again fully compliant for all parameters for 2017/2018.

  • The treated water from the New Plymouth, Inglewood, Oakura and Okato water treatment plants are continuously monitored for free available chlorine residual and pH.
  • The treated water from the New Plymouth, Inglewood and Okato water treatment plants are continuously monitored for turbidity.
  • The treated water from Okato is also continually monitored for UV dose.
  • The reticulation system is routinely sampled and tested for E-coli organisms and free available chlorine and pH. This microbiological monitoring programme and the test results comply with the requirements of the Drinking Water Standards for New Zealand.  

The MoH publishes a Register of Drinking Water Suppliers for New Zealand. The latest version can be viewed on the Environmental Science and Research website.
The MoH also conducts an annual review of all drinking water suppliers on this register. You can view detailed information about the Annual Review of Drinking Water Quality in New Zealand on the Ministry of Health website.  

If you require a higher level of treatment than that required by the Drinking Water Standards for New Zealand, you will need to install the requisite treatment facilities on your own site as our bylaw states: 'If a customer has a particular requirement for an uninterrupted level of service, (flow, pressure or quality) it will be the responsibility of that customer to provide any necessary storage, back-up facilities or equipment.'

Drinking water quality

New Plymouth District Council’s laboratory samples the tap water twice per month and analyses it for pH, alkalinity, temperature, dissolved solids, calcium, magnesium and total hardness.

Analysis results for the last year is shown in the PDF below. The quality parameters are fairly consistent, with minor seasonal variations.