|Title||Groundwater Nitrate Trend Analysis Report For data collected between 2003 and 2016|
|Date published||1 May 2017|
|GWRC Publication No||GW/ESCI-T-17-49|
|Abstract||This report presents the findings of a trend analysis undertaken on nitrate-nitrogen results collected as part of Greater Wellington Regional Council’s Groundwater State of the Environment monitoring programme between 2003 and 2016. Of the 46 sites analysed, three had increasing concentrations and eleven had decreasing concentrations of nitrate in the groundwater. While determining the causes of trends in groundwater is complex, land use change in the capture zones of the sampling wells was considered to be a major factor.
Keywords: nitrate, nitrogen, groundwater quality, trends, land use change, capture zones
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