As part of the Ministry's national environmental reporting programme, this report summarises water quality trends at National River Water Quality Network sites between 1989 and 2007.
As part of the Ministry's national environmental reporting programme, this report summarises water quality trends at National River Water Quality Network sites between 1989 and 2007.
The report updates an analysis of trends in water quality between 1989 and 2003 which was summarised in Environment New Zealand 2007.
Important note: This second edition report replaces the original publication dated March 2009. This edition uses a newer version of the trends software and a higher number of decimal places, which has improved the accuracy of the report and removed some false zero trends reported in the original. While this has led to small changes in trend strength for some water quality variables, trend directions are still the same, and the overall picture remains one of water quality deterioration.