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A risk framework to evaluate greywater reuse policies and consents

Please note: As of 1 July 2025, the New Zealand Institute for Public Health and Forensic Science (PHF Science) is the new name for the Institute of Environmental Science and Research (ESR). Research and reports published prior to this date may reference the organisation’s former name.

Summary

This document presents elements of a risk framework that can be used as a tool to evaluate if the risks associated with greywater reuse are adequately addressed and that the risk mitigation measures will work within councils’ policies, permitted activity rules, guidelines and resource consent applications. The framework uses parts of a risk framework relating to system analysis and management. It includes identification of hazards, appropriate preventive control measures for risk treatment and processes for assurance that the risk treatment(s) will be effective.

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