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Select an indicator:

  • Chloride
  • Dissolved reactive phosphorus
  • E. coli
  • Electrical conductivity
  • Nitrate nitrogen

View by:

Select trend period:

  • 10 years
  • 15 years

Groundwater Quality Indicators

Chloride
State
370
mg/L
5-year median
Trend
Very likely degrading

Sample history at this site

Showing:
Chloride samples for Mangawhai GW at Black Swamp Rd (Riverside Camp)

What is this graph showing me?

This graph is displaying chloride 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. 

Yellow coloured bars on the graph represent measured values.  Grey coloured bars represent concentrations that were either below or above the detection limit for the lab method used (detection limit details are not currently able to be viewed for Auckland, Waikato or Bay of Plenty regions).  You can hover over the top of bars to see the sample dates and values.  

You can also compare the measured values to the Drinking-water Standards for New Zealand (DWSNZ) benchmark.  The guideline value for chloride concentrations in drinking water is 250 mg/L.  Concentrations above this may affect the taste of the water.

Water quality can change with groundwater levels.  For some well sites the groundwater level (taken at the same time as the water quality sample) is also available to view.  

Find out how state and trend are calculated.

Dissolved reactive phosphorus
State
0.1
mg/L P
5-year median
Trend
Not Assessed

Sample history at this site

Showing:
Dissolved reactive phosphorus samples for Mangawhai GW at Black Swamp Rd (Riverside Camp)

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. 

Yellow coloured bars on the graph represent measured values.  Grey coloured bars represent concentrations that were either below or above the detection limit for the lab method used (detection limit details are not currently able to be viewed for Auckland, Waikato or Bay of Plenty regions).  You can hover over the top of bars to see the sample dates and values.  

Water quality can change with groundwater levels.  For some well sites the groundwater level (taken at the same time as the water quality sample) is also available to view.  

Find out how state and trend are calculated.

E. coli
State
Detected
Was E. coli detected at least once in 2015-19?
Trend
Indeterminate

Sample history at this site

Showing:
E. coli samples for Mangawhai GW at Black Swamp Rd (Riverside Camp)

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. 

Yellow coloured bars on the graph represent measured values.  Grey coloured bars represent concentrations that were either below or above the detection limit for the lab method used (detection limit details are not currently able to be viewed for Auckland, Waikato or Bay of Plenty regions).  You can hover over the top of bars to see the sample dates and values.  

You can also compare the measured values to the Drinking-water Standards for New Zealand (DWSNZ) benchmark.  E. coli must not be detected in a 100 mL sample of drinking water (the test result must be <1 CFU/100 mL).  If E. coli is detected, the water must be treated to ensure it is safe for human consumption. 

Water quality can change with groundwater levels.  For some well sites the groundwater level (taken at the same time as the water quality sample) is also available to view.  

Find out how state and trend are calculated.

Electrical conductivity
State
1646
µS/cm
5-year median
Trend
Very likely degrading

Sample history at this site

Showing:
Electrical conductivity samples for Mangawhai GW at Black Swamp Rd (Riverside Camp)

What is this graph showing me?

This graph is displaying electrical conductivity 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. You can hover over the top of bars to see the sample dates and measured values.  

Water quality can change with groundwater levels.  For some well sites the groundwater level (taken at the same time as the water quality sample) is also available to view.  

Find out how state and trend are calculated.

Nitrate nitrogen
State
0.002
mg/L N
5-year median
Trend
Not Assessed

Sample history at this site

Showing:
Nitrate nitrogen samples for Mangawhai GW at Black Swamp Rd (Riverside Camp)

What is this graph showing me?

This graph is displaying nitrate 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. 

Yellow coloured bars on the graph represent measured values.  Grey coloured bars represent concentrations that were either below or above the detection limit for the lab method used (detection limit details are not currently able to be viewed for Auckland, Waikato or Bay of Plenty regions).  You can hover over the top of bars to see the sample dates and values.  

You can also compare the measured values to the Drinking-water Standards for New Zealand (DWSNZ) benchmark.  The maximum acceptable value for nitrate nitrogen is 11.3 mg/L.  Concentrations above this can pose a health risk to bottle-fed infants.

Water quality can change with groundwater levels.  For some well sites the groundwater level (taken at the same time as the water quality sample) is also available to view.  

Find out how state and trend are calculated.

Water quality can change with groundwater levels