Drinking Water

To demonstrate compliance with the New Zealand Drinking-Water Standards 2005(Revised 2008), water suppliers need to monitor the quality of their drinking-water by taking water samples and having them analysed. The Ministry of Health requires all such testing to be performed by laboratories that have appropriate skills and quality assurance procedures.These laboratories, each with a specified list of tests, are recorded in the Register of Ministry of Health Recognised Laboratories.

International Accreditation New Zealand manages this Register on behalf of the Ministry, using a special copy of the Drinking Water Online (DWO) database. Any changes to the Register are uploaded to the DWO at ESR, and from there are made available to all DWO users.


The scope of application of the Register is restricted to:

1. Laboratories that test drinking water from a community drinking water supply for the purpose of grading water supplies i.e. those laboratories that contribute or intend to contribute (either directly or indirectly) test results into the DWO database.
2. Tests or determinants which are detailed in the Drinking Water Standards for New Zealand: 2005 (Revised 2008) (against which community drinking water supplies are graded).

Tests of water for any other purpose are outside the scope of this programme. Accreditation for such tests can be sought under the IANZ chemical and/or biological testing programmes.

Registration Criteria

Laboratories will be listed in the Register once they have been assessed and demonstrate compliance with either:

  • NZS ISO/IEC 17025:2005 General Requirements for the Competence of Testing and Calibration Laboratories and specific technical criteria i.e. fully IANZ accredited laboratories, or
  • The Ministry of Health Level 2 Criteria, and specific technical criteria i.e. Level 2 Recognised Laboratories.

Find a Laboratory

Choose from these options to find a suitable lab for analysing your water supply:

A. See all New Zealand MoH Recognised Laboratories
B. Labs for a New Zealand region
C. Labs for a particular test