Nitrate in freshwater and marine water

Toxicant default guideline values for protecting aquatic ecosystems

The ANZECC/ARMCANZ (2000) default guideline value for nitrate was erroneous. In the absence of an ANZG (2018) default guideline value, refer to the "Grading" guideline values published in the Updating nitrate toxicity effects on freshwater aquatic species report - which were used to inform the current New Zealand nitrate toxicity attribute.