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Porirua Stream

The Porirua Stream is located to the south of Te Awarua-o-Porirua Harbour. It flows in a northwesterly direction from the hills of Belmont Regional Park and discharges into Te Awarua-o-Porirua Harbour. 

The stream supports six species of native fish, which are longfin and shortfin eels, giant kōkopu, inanga, redfin and common bullies. However, The stream also exhibits many of the characteristics of an urban stream, including bank erosion, lack of riparian vegetation and channelisation.

Greater Wellington Regional Council carries out environmental monitoring at two sites in the Porirua Stream. Recreational water quality is not monitored.

The landuse surrounding the Porirua Stream is predominantly urban, with some pastoral land in the upper reaches of the catchment. This has led to poor water quality in parts of the stream.  

Pressures on stream water quality include urban stormwater and subdivision development, including the piping and filling of streams. The fact that this stream is fairly small may mean that it is affected more readily by pollution, as contaminants are not diluted as quickly as in larger rivers or streams.

Sites 2

Monitored sites in the Porirua Stream catchment

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Scientific Indicators
Scientific data for this catchment

This dashboard shows information on the data collected by the regional councils for water quality indicators, analysed as state and trend.

The state for the catchment is represented by the median concentration for the parameter across all sites within the catchment and then compares that value to the quartiles for all monitored sites in New Zealand.

Click on the parameters state icons to compare this catchment with others in the region.

  • State

    State shows how the median of samples from this site compares to other sites

  • Trend

    Trend shows how the quality of water is changing over time. Depending on the sampling history duration, five and ten year timescales are available:

Can I trust this data?

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.

Can I trust the data?
Data Collection

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.

State

All samples were collected using approved field protocols and have been analysed in accredited laboratories.

Trend - Adjustment for flow

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.

Bacteria

E. coli
State
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Trend
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Clarity

Clarity

Black disc
State
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Trend
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Clarity

Turbidity
State
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Trend
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Nitrogen

Nitrogen

Total Nitrogen
State
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Trend
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Nitrogen

Total Oxidised Nitrogen
State
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Trend
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Nitrogen

Ammoniacal Nitrogen
State
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Trend
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Phosphorus

Phosphorus

Dissolved Reactive Phosphorus
State
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Trend
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Phosphorus

Total Phosphorus
State
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Trend
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Download Data

.ZIP file of indicator readings for all sites in New Zealand
Download
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 LAWA Partners shall not be liable, whether in contract, tort, equity or otherwise, for any loss or damage of any type (including consequential losses) arising directly or indirectly from the inadequacy, inaccuracy or any other deficiency in information supplied irrespective of the cause.  Use of information supplied is entirely at the risk of the recipient and shall be deemed to be acceptance of this liability exclusion.