The West Coast Regional Council focuses its monitoring effort on waterways where there is human activity rather than keeping track of water quality across the entire region. Therefore results indicate the level of impact of human activities in the minority of catchments where people live. Monitoring sites are designed to cover a representative combination of the major land use activities, e.g. mining, agriculture and urban drainage. Sampling of bugs in streams () shows water quality is good in the top three quarters of monitoring sites, with the bottom quarter consistently rating moderate to poor. There has been some recent improvement in results for , , , and .
Nutrient monitoring in the Grey and Buller rivers indicates that while ammoniacal nitrogen has decreased, other forms of nitrogen - total nitrogen and nitrate - have increased. Nitrogen levels, although increasing, are still low. The region’s frequent rainfall means we seldom see any algal growth related to high nutrient levels.
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 data 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.
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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