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Ngaruroro at Chesterhope (NIWA site)

This site is monitored by NIWA as part of the NRWQN. This site is also monitored for recreational water quality by HBRC during the summer months, as the shaded river berms areas are popular for fishing, swimming during summer.

 

This site is located on the Ngaruroro River just on the downstream side of the Pakowhai Road Bridge.  The Ngaruroro is a  major regional river which drains Heretaunga Plains and upstream of this location recharges groundwater (which is a major domestic and industrial supply). It is also a valued fishery.

Upstream major horticulture/pasture development.

Scientific Indicators
Scientific data for this site

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

  • State

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

    This site is a Lowland Rural site. Currently showing the state of this site compared to:

  • The state is also represented by comparison to the National Objectives Framework (NOF) in the National Policy Statement for Freshwater Management 2014  for some indicators.

  • 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:

The state is also represented by comparison to the National Objectives Framework (NOF) in the National Policy Statement for Freshwater Management 2014  for some indicators.


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 for this site?
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 - SAMPLING FREQUENCY

Samples are collected monthly at this site. Proposed national guidelines suggest monthly sampling is required for trend analysis. Therefore, any trends shown here are based on best practice in terms of sampling frequency.

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
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State
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State
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{{nofMsg(ECOLI.NofMedianScore)}} Annual median
N/A
NOF Band Annual median
Trend
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Sample history at this site

Showing:
E. coli samples for Ngaruroro at Chesterhope (NIWA site)
n/100ml

What is this graph showing me?

This graph is displaying E. coli concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

What do the icons mean?

It is important to note that changes to the National Policy Statement for Freshwater Management 2014 were announced in August 2017. The changes have removed the below set of criteria for E. coli, and any reference to this use of water (i.e. occasional immersion). The new criteria, effective from 6 September 2017, are for the use of water for swimming and other full contact, sustained exposure activities (diving, surfing etc). The data on LAWA has not yet been updated to reflect the new requirements.

The bands for E. coli are as outlined in the NOF for freshwater:

A
Water quality is considered suitable for the designated use. People are exposed to a very low risk of infection (less than 0.1% risk) from contact with water during activities with occasional immersion (such as wading and boating).
B
Water quality is considered suitable for the designated use. People are exposed to a low risk of infection (less than 1% risk) from contact with water during activities with occasional immersion (such as wading and boating).
C
Water quality is considered suitable for the designated use. People are exposed to a moderate risk of infection (less than 5% risk) from contact with water during activities with occasional immersion (such as wading and boating).
National bottom line: Annual median 1000 n/100mL.
D
Water quality is not considered suitable for the designated use. People are exposed to a high risk of infection (greater than 5% risk) from contact with water during activities with occasional immersion (such as wading and boating).

Clarity

Black disc
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State
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Trend
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Sample history at this site

Showing:
Black Disc samples for Ngaruroro at Chesterhope (NIWA site)
metres

What is this graph showing me?

This graph is displaying Black Disc readings over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

Turbidity
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State
{{stateMsg(TURB.StateScore)}}
Trend
{{trendMsg(TURB)}}

Sample history at this site

Showing:
Turbidity samples for Ngaruroro at Chesterhope (NIWA site)
NTU

What is this graph showing me?

This graph is displaying Turbidity levels over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

Nitrogen

Total Nitrogen
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State
{{stateMsg(TN.StateScore)}}
Trend
{{trendMsg(TN)}}

Sample history at this site

Showing:
Total Nitrogen samples for Ngaruroro at Chesterhope (NIWA site)
g/m3

What is this graph showing me?

This graph is displaying Total Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

Total Oxidised Nitrogen
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State
{{stateMsg(TON.StateScore)}}
State
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{{nofMsg(TON.NofMedianScore)}} Annual median
N/A
NOF Band Annual median
{{percentileValue('TON')}}
State
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{{nofMsg(TON.NofPercentileScore)}} 95th percentile
N/A
NOF Band 95th percentile
Trend
{{trendMsg(TON)}}

Sample history at this site

Showing:
Total Oxidised Nitrogen samples for Ngaruroro at Chesterhope (NIWA site)
g/m3

What is this graph showing me?

This graph is displaying Total Oxidised Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

What do the icons mean?

The bands for Total Oxidised Nitrogen are as outlined in the NOF for freshwater:

A
Water quality is considered suitable for the designated use. High conservation values system. Unlikely to be effects even on sensitive species.
B
Water quality is considered suitable for the designated use. Some growth effect on up to 5% of species.
C
Water quality is considered suitable for the designated use. Growth effects on up to 20% of species (mainly sensitive species such as fish). No acute effects.
National bottom line: Annual median 6.9 mg NO3-N/L. Annual 95th percentile 9.8 mg NO3-N/L (milligrams nitrate-nitrogen per litre). Note 1 mg/l = 1 g/m3
D
Water quality is not considered suitable for the designated use. Impacts on growth of multiple species, and effects starts approaching acute impact level (i.e. risk of death) for sensitive species at higher concentrations (>20 mg/L).
Ammoniacal Nitrogen
{{medianValue('NH4')}}
State
{{stateMsg(NH4.StateScore)}}
{{nofMedianValue('NH4')}}
State
{{NH4.NofMedianScore | uppercase}}
{{nofMsg(NH4.NofMedianScore)}} Annual median
N/A
NOF Band Annual median
{{maximumValue('NH4')}}
State
{{NH4.NofMaxmiumScore | uppercase}}
{{nofMsg(NH4.NofMaxmiumScore)}} Annual maximum
N/A
NOF Band Annual maximum
Trend
{{trendMsg(NH4)}}

Sample history at this site

Showing:
Ammoniacal Nitrogen samples for Ngaruroro at Chesterhope (NIWA site)
g/m3

What is this graph showing me?

This graph is displaying Ammoniacal Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

What do the icons mean?

The bands for Ammoniacal Nitrogen are as outlined in the NOF for freshwater:

A
Water quality is considered suitable for the designated use. 99% species protection level: No observed effect on any species tested.
B
Water quality is considered suitable for the designated use. 95% species protection level: Starts impacting occasionally on the 5% most sensitive species.
C
Water quality is considered suitable for the designated use. 80% species protection level: Starts impacting regularly on the 20% most sensitive species (reduced survival of most sensitive species).
National bottom line: Annual median 1.30 mg NH4-N/L. Annual maximum 2.20 mg NH4-N/L (milligrams ammoniacal-nitrogen per litre). Note 1 mg/l = 1 g/m3
D
Water quality is not considered suitable for the designated use. Starts approaching acute impact level (ie risk of death) for sensitive species.

Phosphorus

Dissolved Reactive Phosphorus
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State
{{stateMsg(DRP.StateScore)}}
Trend
{{trendMsg(DRP)}}

Sample history at this site

Showing:
Dissolved Reactive Phosphorus samples for Ngaruroro at Chesterhope (NIWA site)
g/m3

What is this graph showing me?

This graph is displaying Dissolved Reactive Phosphorus concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

Total Phosphorus
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State
{{stateMsg(TP.StateScore)}}
Trend
{{trendMsg(TP)}}

Sample history at this site

Showing:
Total Phosphorus samples for Ngaruroro at Chesterhope (NIWA site)
g/m3

What is this graph showing me?

This graph is displaying Total Phosphorus concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

Download Data

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

 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.

Recreation
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

    {{sampleComment()}}
    Show more information Hide

    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}}

    {{comment()}}
    Show more information Hide

    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
  • Activity
    No information available

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