This indicator measures groundwater quality in New Zealand’s aquifers and how it is changing over time, based on measurements made at monitored sites. We report on nitrate-nitrogen, ammoniacal nitrogen, dissolved reactive phosphorus, chloride, conductivity and Escherichia coli (E. coli) including:
- trends in concentrations for 10-year (2009–18) and 20-year (1999–2018) periods.
More information on this dataset and how it relates to our environmental reporting indicators and topics can be found in the attached data quality pdf.
