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Hutt River

The Hutt River is one of the largest in the Wellington Region. With headwaters in the Rimutaka Range, the river flows through the Hutt Valley past Upper Hutt and Hutt cities before discharging into Wellington Harbour at Petone.

The Hutt River is very popular for swimming, trout fishing and other recreational activities. It is easily accessible from the Hutt River trail which provides a scenic walk and cycle path. Dogs are permitted.

Greater Wellington Regional Council monitors the environmental health of the river at nine locations, and recreational water quality at seven locations within this catchment.

Much of the upland catchment is located within the bush-clad Kaitoke Regional Park which is a key water supply area for the region’s four main cities. Further down in the valley the river and its tributaries flow through areas of agricultural and urban land use.

Environmental health and water quality in the Hutt River and most tributaries in the upper western part of the catchment (including the Akatarawa and Whakatikei Rivers) is generally very good. In contrast, some tributaries in the eastern part of the catchment have poorer water quality, for example, the Mangaroa River is affected by intensive agricultural land use while Hulls Creek, Stokes Valley Stream and the Waiwhetu Stream are affected by urban land use.

Sites 15

Monitored sites in the Hutt 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.


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.


E. coli



Black disc





Total Nitrogen


Total Oxidised Nitrogen


Ammoniacal Nitrogen



Dissolved Reactive Phosphorus


Total Phosphorus

Download Data

.ZIP file of indicator readings for all sites in New Zealand

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