Groundwater quality state 2010–2014

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3795
11
Updated
11 Jun 2021

This dataset was last updated on MfE Data Service on 11 Jun 2021.

11 June 2021: A revised version of this dataset has been published to correct the terminology used to compare nitrate-nitrogen values to the 3 g/m3 guideline value. The field name has been changed from “ref_meet” to “n_n_guideline”, and values in this field will now be either “Does not exceed” or “Exceeds”, instead of “Meets” or “Does not meet”.

This dataset measures groundwater quality in New Zealand’s aquifers based on measurements made at monitored sites. Many factors influence the quality of our groundwater. Nitrogen, which occurs naturally in groundwater, can increase in concentrations due to agricultural and urban land use, and infrastructure such as waste treatment plants. High concentrations of nitrate-nitrogen in groundwater can affect human health and the quality of surrounding rivers and lakes that receive inflows from groundwater. Ammoniacal nitrogen can cause an undesirable smell that may make groundwater unsuitable for drinking water. Natural processes in groundwater can convert nitrate-nitrogen into ammoniacal nitrogen or other forms under some chemical conditions. Surplus phosphorus drains (leaches) into groundwater as dissolved reactive phosphorus. Too much nitrate-nitrogen, ammoniacal nitrogen, and phosphorus can lead to excessive plant and algae growth where groundwater flows into surface water. E. coli in groundwater is measured in colony forming units (cfu) and can indicate the presence of pathogens (disease-causing organisms) from animal or human faeces. The pathogens can cause illness for anyone who ingests them.

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.

License

Creative Commons Attribution 4.0 International

You may use this work for commercial purposes.

You must attribute the creator in your own works.

Attachments
1. Groundwater_quality_state_data_quality_report_2010-14 200 KB pdf
Technical Details
Table ID 99855
Data type Table
Row count 741
Columns s_id, np_id, n_values, n_leftcensored, n_rightcensored, dl, al, q_5, q_20, q_25, median, q_75, q_80, q_95, g_540, g_260, ann_max, imputed_lower, imputed_upper, quarter_ok, c_q_5, c_q_20, c_q_25, c_median, c_q_75, c_q_80, c_q_95, c_ann_max, period, np_id_units, np_id_name, programme, easting, northing, long, lat, n_n_guideline
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed
History
Added 14 Apr 2019
Last updated 11 Jun 2021
Revisions 9 - Browse all revisions
Current revision Imported on June 11, 2021 from CSV .