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Wainuiomata River

The Wainuiomata River is located to the east of Wellington Harbour, where is rises from the Rimutaka Ranges and flows for 22 kilometres before discharging into the sea on Wellington’s south coast.  The river catchment provides water to four of Wellington’s main centres, and contributes to approximately 15 percent of the region’s water supply.

The Wainuiomata River supports a variety of recreational activities such as fishing, swimming, kayaking, and horse riding. It is also supports healthy populations of dwarf galaxias, a nationally threatened species of fish found in the upper reaches of the river.

Greater Wellington Regional Council monitors the environmental health of the river at two locations, and recreational quality at one site within the catchment. 

The Wainuiomata River is surrounded by native forest in its upper reaches. Here it is protected for water supply. The river flows through the urban area of Wainuiomata in its mid reaches and is surrounded by pastoral land in its lower reaches.  

The water quality of the Wainuiomata River is generally good from an environmental health perspective, although it is not always safe for swimming and can be affected by cyanobacteria (also known as 'toxic algae') during the summer months. The main pressures on water quality in this river are residential and agricultural discharge, as well as faecal contamination in the lower catchment.

Sites 3

Monitored sites in the Wainuiomata River 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
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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.