The water quality classification is derived from a combination of water quality parameters and biological indicators. The ‘long term’ classification, from information collected between 2000-2007, is compared against the annual result for each site to track changes in water quality over time.
In addition, Nelson City Council monitors a network of small streams for flow and water temperature, mainly for assessing water resources outlined in the Nelson Regional Management Plan (Freshwater Plan).
Council staff have initiated a number of studies and assist communities, schools and groups to improve and maintain our waterways. For further information about Council environmental monitoring please visit Nelson City Council's website.
Nelson Rivers and streams are affected mainly by sediment resulting from land disturbance, microbial contamination associated with livestock and feral animals, and from urban stormwater in the city area.
Overall water quality is highest in the forest catchments that dominate most of the Nelson land area. It is less satisfactory in intensively farmed valley bottoms and poorest in urban streams receiving road, commercial and industrial stormwater runoff.
This dashboard shows information on the data collected by the regional councils for water quality indicators, analysed as
The state for the region is represented by theconcentration for the across all sites within the region and then compares that value to the for all monitored sites in New Zealand.
Click on the parameters state icons to compare this region with others nationally.
State shows how theof samples from this site compares to other sites
Trend shows how the quality of water is changing over time. Depending on the sampling history duration, five and ten year timescales are available:
The Cawthron Institute has worked alongside regional councils to verify the processes and methods used for data collection, laboratory analysis of samples collected and the statistical analysis and interpretation of the results presented.
If all Cawthron ticks are green, then you can trust this data. However, if one or more ticks are orange, then conclusions should be treated with some caution.
For more details on each tick, see our 'Can I Trust This Data?' Factsheet.
All samples were collected using approved field protocols and have been analysed in accredited laboratories. Therefore the data shown here has been collected and analysed following best practice.
This site is not sampled during high flows so the data shown only represents base flow conditions. Proposed national guidelines recommend sampling during both low and high flows to get a full picture of water quality at the site.
This data is not flow adjusted. National guidelines suggest that flow-sensitive variables are flow 'adjusted' before trend analysis. Therefore, any trends shown here may be affected by variations in flow across sampling occasions.
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