Abstract

The report provides information on the routine monthly monitoring of water quality at 110 locations across the Waikato region, and includes:

year 2019 summary statistics tabulated by parameter and reported together.
spatial contour plots for four water quality parameters using spatial interpolation of the median of the previous 5 years.
summary tables identifying the number of samples meeting ‘satisfactory’ and ‘excellent’ water quality guidelines and standards.

Contents
1	Introduction	1
1.1	Background	1
1.2	Report content	1
1.3	Water quality guidelines and standards	1
2	Regional rivers monitoring design	2
2.1	Sampling locations	2
2.2	Sample collection	6
2.3	Water quality parameters	6
2.4	Quality control, data storage and analysis	6
2.5	Report	6
3	Results	6
3.1	Regional rivers monitoring programme	7
3.1.1	Summary statistics	7
3.1.2	Major ion statistics	41
3.1.3	Low level metals statistics	44
3.1.4	Pesticides	51
3.2	Regional rivers monitoring programme comparison with water quality guidelines and standards	54
References		58
Appendix I: Water quality guidelines and standards		59
Appendix II: Water quality monitoring parameters		60
Field instruments and analytical methods		60