The Drinking-water Standards for New Zealand set different criteria for different sizes and types of drinking-water supplies.
There are three main components:
* The water quality standards that specify the maximum acceptable values (MAVs) at which the risk of disease or illness from drinking the water is negligible.
* The compliance criteria and reporting requirements which define the checks needed to show the water supply is not exceeding the standards.
* The remedial actions.
The water quality standards are the same for all supplies, regardless of size or type because they relate to the health effects on people.
The Rural Agricultural Drinking-water Supply Guideline defines a rural agricultural drinking water supply and gives options on how to meet the required Standard.
A RDWS can supply a population of any size but at least 75% of the total water must be used for stock water or irrigation.
The domestic usage is based on 2500 Litres per dwelling per day.
Only water used for human consumption, domestic and food preparation needs to meet the requirements to provide potable water that does not exceed the MAV’s set out in the Standards for NZ.