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Data and trends

The link below points to a file that contains the source data to this indicator's graph and any additional data.

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  • Data were collected from 2003–12 in the Waikato River and 2000–09 for the Waihou and Piako/ Waitoa rivers).

The graphs show the amounts of nitrogen and phosphorus in four major Waikato rivers that come from background sources, point sources, or developed land.

Sources of nitrogen and phosphorous in three major Waikato region rivers

sources of nitrogen and phosphorous in three major Waikato region rivers