Environment - Urban stream water quality trends at monitored sited in Auckland, Wellington, and Christchurch 2008–2015

Ministry for the Environment


Zinc and copper are heavy metals that can accumulate in sediments, shellfish, and other aquatic organisms. Metals can reach toxic levels in organisms making them unsafe to eat and can be toxic to aquatic life.
Nitrogen and phosphorus are nutrients that can cause excessive algal growth. Ammonical nitrogen and nitrate-nitrogen can be toxic to aquatic life if concentrations in streams are high enough.
E.coli is an indicator of disease-causing organisms, which may affect human health and recreational values in streams.

Data calculation/treatment

Figure.NZ undertook simple calculations on the original csv data (sum by outcome and indicator) to mirror the analysis undertaken for the Environmental Reporting Series (see http://stats.govt.nz/browse_for_stats/environment/environmental-reporting-series/environmental-indicators/Home/Fresh%20water/urban-stream-water-quality.aspx Figure 1)

Data provided by

Ministry for the Environment

Dataset name

Environmental Reporting: Urban stream water quality trends 2008–2015



How to find the data

At URL provided, select 'Download' from the top right of the screen. You will have to register to download this dataset.

Import & extraction details

File as imported: Environmental Reporting: Urban stream water quality trends 2008–2015

From the dataset Environmental Reporting: Urban stream water quality trends 2008–2015, this data was extracted:

  • Sheet: Sheet1
  • Range: B6:D11
  • Provided: 18 data points

Dataset originally released on:

April 24, 2017

Method of collection/Data provider

Auckland Council, Greater Wellington Regional Council, and Christchurch City Council collect urban stream water samples monthly at fixed locations and send them to a laboratory for chemical and bacterial analysis.