Health - Drinking water quality achievement against the Standards by supply size Year ended June 2019
Ministry of Health
The Act groups drinking water supplies into supply size categories according to the population served. The four supply size categories used in this report are large (more than 10,000 people), medium (5,001 to 10,000 people), minor (501 to 5,000 people) and small (101 to 500 people people).
Bacteriological achievement: determined primarily using Escherichia coli monitoring
Protozoal achievement: based on monitoring the effectiveness of the treatment processes used to remove or inactivate Cryptosporidium.
Chemical achievement: assessed for those supplies that have been identified as containing chemicals that require monitoring (known as Priority 2 determinands).
Overall achievement: assessed on the basis of Escherichia coli and chemical monitoring. There is no requirement to directly monitor for protozoa in the Standards.
Monitoring: provides a check that the water safety plan is operating satisfactorily, and indicates whether remedial action is required.
Provision of drinking water: a requirement to take all practicable steps to ensure the adequacy of supply and in the event of an interruption, planned or otherwise, to take appropriate action.
Source protection: Protection of source waters reduces the number and concentrations of contaminants that the water treatment system has to deal with.
Records: the keeping of records assists water suppliers and drinking-water assessors in determining whether a supply meets the requirements of the Act and achieves the Standards.
Complaints: consumer concerns about drinking-water quality, which often relate to the aesthetic properties of the water (taste, odour and appearance).
Remedial action: appropriate actions in the event that monitoring reveals contamination of the water and that the Standards are breached.
Population figures are rounded to the nearest thousand (nearest hundred for small supplies).
All 490 registered networked drinking-water supplies that served populations of more than 100 people (the supplies) representing 4,077,000 people (the report population).
Changes to data collection/processing
The revised 'Drinking-water Standards for New Zealand' came into force on 1 March 2019, part way through the July 2018 to June 2019 reporting period, so were partly included in the annual report for the first time.
Data provided by
Annual Report on Drinking-water Quality 2019
How to find the data
At URL provided, select 'Annual Report on Drinking-water Quality 2018-2019' from the right-hand column. The data can be found in tables throughout the document, which we have pasted into a spreadsheet for internal processing purposes.
Import & extraction details
File as imported: Annual Report on Drinking-water Quality 2019
From the dataset Annual Report on Drinking-water Quality 2019, this data was extracted:
- Sheet: Table 5-8
- Provided: 48 data points
Dataset originally released on:
June 30, 2020
About this dataset
This report discusses compliance among all 490 registered networked drinking-water supplies that served populations of more than 100 people (the supplies) from 1 July 2018 to 30 June 2019 (the reporting period), representing 4,077,000 people (the report population), against the drinking-water requirements of the Health Act 1956 (the Act) and the Drinking-water Standards for New Zealand 2005 (Revised 2018) (the Standards). It also discusses changes to the Act and the Standards that occurred during this reporting period and other work undertaken by the Ministry of Health to improve drinking water for New Zealand.
During the reporting period, the Ministry of Health prepared and submitted the Health (Drinking Water) Amendment Bill to Cabinet. The Health (Drinking Water) Amendment Act 2019 received the Royal assent on 31 July 2019 and entered into force on 1 August 2019. The amendments that Act introduces are just a small part of the government response to the Havelock North Drinking Water Inquiry, and will improve the effectiveness and efficiency of the current framework while Government considers advice and makes further decisions on the future regime for drinking water.
Method of collection/Data provider
Information on drinking-water quality was obtained from drinking-water assessors employed by district health board public health units, using questionnaires that sought data relating to water supply quality, monitoring and management. The information was collected at the level of the distribution zone. Two surveys were used to gather information.
The first survey sought information about the microbiological and chemical quality of the drinking-water, water treatment processes in use, the means used to demonstrate achievement against the Standards, and the status of water safety plans. This survey utilised the online Water Information New Zealand (WINZ) database.
The second survey sought information relating to the management of the supplies by drinking-water suppliers, in terms of the requirements of the Act that will eventually apply to water suppliers. The completed spreadsheets were returned to ESR for compilation and analysis.