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Figure 10.12: Median nitrate levels in groundwater, 1995–2006

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Note:

mg/L = milligrams per litre.

Source: Adapted from Ministry for the Environment, in press b. 

Text description of figure

Map showing all New Zealand monitoring wells colour-coded according to the nitrate category they fall into (3 categories covering the range 0 to >11.3 mg/L). Regions with a significant proportion of wells that have median nitrate exceeding 5.65 mg/L (i.e. half the New Zealand Drinking Water Standard) are Waikato, Manawatu, Wairarapa, Taranaki, Canterbury and Southland.