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Non-achievement of the Drinking water Standards for New Zealand

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 report was prepared for the Ministry of Health to gain a better understanding of the reasons for nonachievement of the E. coli (Escherichia coli) and chemical requirements of the Standards.

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