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Ruamahānga River at Te Ore Ore

The Ruamahānga River at Te Ore Ore is located on the Ruamāhanga River immediately east of Masterton and is accessed via Oliver Road. This site is a good example of how the water quality of the river can be good from an environmental health perspective, but is not always good for swimming.

The site is monitored as a part of two separate programmes; the Recreational Water Quality Programme, which informs the public about the suitability of sites for recreational activities (see the 'Can I Swim Here' module), as well as the Rivers Environmental Monitoring Programme, which is designed to measure the environmental health of rivers and streams (see the 'River Quality' module).

The safety of water for swimming is determined by measuring ‘faecal indicator bacteria’ (E. coli) which indicates the likely levels of pathogens in the water. Monitoring is conducted on a weekly basis over the summer months (December to March).

Monitoring of the variables that affect the environmental health of the river is carried out monthly. This involves the assessment of water clarity, nitrogen and phosphorus concentration, dissolved oxygen, pH and the concentration of the bacteria Escherichia coli (E. coli). The Macroinvertebrate Community Index (MCI) classifies the site based on the number of and different types of macroinvertebrates living there and is measured annually.

Overall, macroinvertebrate health is generally good at this site, and it is usually safe to swim during dry weather. However the site is known to be affected by faecal contamination from rural run-off following heavy or prolonged rainfall.  We therefore advise people not to swim for at least two days after heavy rain.This is a reflection of the surrounding land cover, which is predominantly pastoral.

For the latest recreational water quality information, please go to the GWRC website, or check out the latest recreational water quality reportsFor more information on Greater Wellington Regional Council's environmental monitoring programmes, check out the latest water quality reports

Recreational water quality

Summer Monitoring:

Many councils monitor popular recreational sites weekly over the summer months. This lets swimmers know what the most recent bacteria (E. coli) levels were. Remember, even for sites where the monitoring has shown an acceptable to swim test result, some conditions can make them unsuitable to swim in from time to time and we recommend that you avoid swimming after heavy rainfall for 48 hours.

Overall Recreation Risk:

The Overall Recreation Risk is a guide to give a general picture of water quality at a site over the recreational bathing season. Updated annually, it is calculated from bacteria (E. coli) data collected over the last three years during the summer monitoring months. The Overall Recreation Risk indicator is a precautionary approach to managing health risk and is not designed to represent health risk on a particular day. As such, a site can have an Overall Recreation Risk of ‘Caution’ but still be suitable for swimming some of the time.

See the factsheet on coastal and freshwater recreation monitoring for more information.

  • Summer season monitoring

    A recent snapshot based on a single sample

    NO DATA

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    Summer season monitoring history

    • Last 4 Samples
    • All samples this season
    E. coli sampling graph
    E. coli sampling table
    Sample Date Status Result Observations

    What do the icons mean?

    Acceptable – continue routine monitoring
    Acceptable – Alert. Increase monitoring and investigate source
    Unacceptable – Action. Immediate re-sample, public warning issued if required, increased monitoring and investigate source
  • Overall recreation risk

    The long term risk status based on three years of data

    {{rating() | uppercase}}

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    Overall recreation risk information

    Human health for primary recreation: overall recreation risk
    Minimum data points required 30 Number of data points available {{dataPoints() | number:0}}
    Lowest E. coli per 100ml value {{minValue() | number:0}} Highest E. coli per 100ml value {{maxValue() | number:0}}
    Hazen percentile result {{hazenResult() | number:0}} Overall recreation risk {{rating()}}

    What do the icons mean?

    VERY LOW RISK
    People are exposed to a very low risk of infection (less than 0.1%) from contact with the water.
    LOW RISK
    People are exposed to a low risk of infection (between 0.1 and 1%) from contact with the water.
    MODERATE RISK
    People are exposed to a moderate risk of infection(between 1 and 5%) from contact with the water.
    CAUTION
    People are exposed to a high risk of infection (greater than 5%) from contact with the water.
    NO DATA
    There are not enough data points (samples) at this site to generate an Overall Recreation Risk result.

Overall Recreation Risk: Very Low Risk
When a site is classed as very low risk, the risk of illness from exposure to E. coli is less than 0.1%.

View a factsheet on all recreational water quality monitoring

Overall Recreation Risk: Low Risk
When a site is classed as low risk, the risk of illness  from exposure to  E. coli is between 0.1 and 1%. 

View a factsheet on all recreational water quality monitoring

Overall Recreation Risk: Moderate Risk
When a site is classed as moderate risk, the risk of illness  from exposure to  E. coli is between 1 and 5%.

View a factsheet on all recreational water quality monitoring

Overall Recreation Risk: Caution
When a site is classed as Caution, the risk of illness from exposure to E. coli is greater than 5%.

View a factsheet on all recreational water quality monitoring

A minimum of 30 samples are required to calculate an overall recreation risk. For more information on this site view the Summer Season Monitoring

This data is collected by trained council staff and analysed by accredited laboratories. Regional Councils are currently reviewing the methodology of how to best calculate recreational water quality. Once new guidelines are established, they will be applied to this data and the appropriate Cawthron Tick will be given.

Recreational activities
Site suitable for these activities
  • Suitable for swimming
  • Suitable for fishing
  • Suitable for dogs

Rivers and Lakes are great natural  playgrounds but they can be unpredictable. Be aware of the other potential risks before jumping in.