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An Assessment of Regional Council Water Quality Data (1996–2002) in Support of National State of Environment Reporting (ENZ07)

1 Introduction

2 Methods

3 Summary Tables

4 Changes in Water Quality State (1997–2002) and Land Use Differences

5 Summary

6 References

Appendix 1: Breakdown of Monitoring Sites by REC Classes

5 Summary

An extensive water quality dataset complied by Larned et al (2003) from regional councils throughout the country provides a useful tool for national-scale state of the environment reporting. One of the benefits of such a national scale compilation is that it provides an independent dataset with which to compare spatial and temporal patterns provided by the National River Water Quality Network. In this regard, it is worth noting that key findings from the present report (eg, increasing trends in concentrations of NO_x-N at the most enriched sites, and patterns in NH₄ concentrations consistent with improvements in point source discharges) mirror national scale trends reported for the NRWQN by Scarsbrook (2006).

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