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Figure 10.8: Concentrations of Escherichia coli (E. coli) bacteria in rivers and streams in catchments with different land uses, 1997–2002

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Notes:

(1) Statistics in the graph are derived from 95th percentile data.

(2) These results include winter sampling results, when faecal-bacteria loads are typically relatively high. This is because there is increased run-off from higher winter rainfall and bacteria tend to live longer in cooler temperatures. However, in general, recreational activities such as swimming do not take place in winter.

(2) mL = millilitres (of water).

Data source: Ministry for the Environment, in press a.

Text description of figure

Box and whisker plot comparing bacteria (E.coli) concentrations in waterways in natural, pastoral and urban catchments. 

 

Dominant land cover

Average 1997-2002

Median

5th

95th

Natural (122)

209

7

5406

Pasture (338)

1179

105

13996

Urban (26)

2558

920

7714